PC/II+ & PC/II+i Technical Manual
Contents
1. 18 1 80 16 bit Bus Expansion Interface J3 25 1 81 16 bit Bus Header Pinout J3 26 1 82 10 pin 16 bit Bus Expansion Pinout J3 26 2 00 96 Pin Peripheral I O Connector J1 28 2 10 Video Titer face sui csicccccsssssevacesenesssseccvaseasendsevasessenaedeesonsseeoanase 29 2 11 LCD Control is noia delos Alani 29 2 12 LED Driven Files 0 265 cde snai a dalai 30 2 13 Some Compatible LCD Signal Names 31 2 14 LCD Portion of RTC Memory Map 31 continued on next page PC II amp PC II i Technical Manual 1999 megatel computer corporation Page 4 MA990734 1 00e PC II amp PC II i Technical Manual Page 2 15 96 pin Eurocard Connector Video Section 32 Using VGA 65530 Video Controller with VGA Monitor 32 Using VGA 65530 Video Controller with EGA Monitor 32 Using VGA 65530 Video Controller with STN LCD s 32 Chart 1 Common Interfaces pin assignments and Settings 33 2 20 Parallel Printer Port crrrercereree reo sere eee sere nice ze ee ezonioneee 34 2 21 96 pin Eurocard Connector Printer Section 35 2 30 Floppy Disk Interface 44 4444 36 2 31 96 pin Eur2. 48 5 00 TAG AGA OSSOS sc sccsscisvstcscscevecesuscsseeaececencsstsestaaseteincsseecsse 49 Standard VO Ma Pr elne AR ERE 49 6 00 Parts Lists amp Parts Layouts sesesssocesocesocesocssocssooseo 50 6 10 PC M Parts Last dre ireira aa 50 6 11 PC TI Parts Layout ceseeeecesecsseesecesecssecsecsseesseenees 51 6 20 PC IL i Parts List viale alari iaia 52 6 21 PC II i Parts Layout 53 7 00 PC II amp PC II i Mechanical Specifications 54 8 00 References ariete 56 9 00 megatel Service Procedure 4 44 57 megatel SERVICE FORM 58 1999 megatel computer corporation PC II amp PC II i Technical Manual Table Of Contents MA990734 1 00e Page 5 Notes PC II amp PC II i Technical Manual 1999 megatel computer corporation Page 6 MA990734 1 00e 1 00 PC II PC IT i Introductions 1 10 Introduction to the PC IT The PC II is a surface mounted single board computer based on the Intel386 SL microprocessor and the Intel 82360SL I O Subsystem It features up to 10MBytes of on board user DRAM up to 256KByte BIOS ROM on board 2MByte Solid State Disk a graphics display controller supporting color LCD panels and analog VGA SVGA monitors a floppy disk controller two full IBM compatible RS 232 serial communication ports a partial RS 232 Seri
3. The megatel PC II amp PC II i Technical Manual 386SL amp 486SL Based Single Board Computers megatel computer 1986 corporation Copyright 1 July 1999 Release 1 00 Order Number MA990734 1 00e megatel computer 1986 corporation 125 Wendell Avenue Weston Ontario Canada M9N 3K9 Tel 416 245 2953 Fax 416 245 6505 Limited Warranty All products including software sold are under a LIMITED WARRANTY on a return to factory basis against defects in workmanship and materials for a period of one year from the date of shipment This LIMITED WARRANTY is contingent upon the proper use of the product The WARRANTY is void if repairs are necessary due to accident unusual physical electrical or electro magnetic stress misuse shipping or causes other than ordinary use The WARRANTY will also not apply if the product has been modified by the BUYER orifthe producthas been disassembled by the BUYER Disassembly includes the removal of the serial number label on the Product without prior written permission from megatel Any repairs attempted by the customer will void the WARRANTY Any tips suggested in the manual or other documentation which involve physical changes to the board or a reconfiguration of the software will if attempted void the WARRANTY Copyright Notice and Trademark acknowledgements No part of this document may be copied or reproduced in any form or by any means without prior written permission from me
4. PC II amp PC II i Technical Manual 1999 megatel computer corporation Page 26 MA990734 1 00e Notes 1999 megatel computer corporation PC II amp PC II i Technical Manual MA990734 1 00e Page 27 2 00 96 Pin Peripheral YO Connector J1 Right Angle 96 pin DIN Eurocard Connector VID P3 SB or VID VID P5 SR VID PO BLUE VID FRM VSYNC VID P8 VID P1 GREEN VID LC HSYNC VID SCK VID P2 RED VID P9 ANGREEN VID M VID GND VID P4 INT or SG VID P10 ANBLUE VID P6 LDO VID P7 LD1 VID P11 ANRED COM2 RI COMI RI RESERVED COM2 DTR COMI DTR SPEAKER COM2 CTS COMI CTS PRN SLCT COM2 TXD COMI1 TXD COM2 RTS COMI RTS COM2 RXD COMI RXD COM2 DSR COM1 DSR COM2 DCD COM1 DCD COM4 RX FDD DCHG COM4 TX KBD DATA KBD CLK PRN SELECTIN PRN INIT 21 PRN DO PRN ERR FDD WD 22 PRN STRB PRN AUTO FDD STP 23 SCSI DO SCSI ATN FDD DIRC 24 SCSI DI SCSI BSY FDD MD2 25 SCSI D2 SCSI AKN FDD DS1 26 SCSI D3 SCSI RST FDD DS2 27 SCSI D4 SCSI MSG FDD MDI 28 SCSI D5 SCSI SEL FDD IDX SCSI D6 SCSI C D FDD GND SCSI D7 SCSI REQ RESERVED 29 30 31 SCSI DP SCSII O FDD RPM lt lt pi et et AD 00 AU A pill SALA EIS N Note JIA pin 3 can be connected to P8 instead of being connected to ENAVEE Note JIA pin 5 can be connected to BLANK instead of being connected to the M signal PC II amp PC II i Technical Manual 1999 megatel computer corporation Page
5. This signal is active low Motor On Drive 2 When active drive 2 has its motor enabled This signal is active low Drive Select Drive 1 When this signal is active it selects drive 1 to read and write data This signal is active low Drive Select Drive 2 When this signal is active it selects drive 2 to read and write data This signal is active low Motor On Drive 1 When this signal is active drive 1 has its motor enabled This signal is active low Index This signal senses the status from the disk drive and when active indicates the head is positioned over the beginning of a track marked by an index hole This signal is active low Revolutions Per Minute Used with dual speed drives When this signal is active it reduces the spindle speed from the B l N S nominal 360RPM to 300RPM This signal is active low IRPM C297 6 amp VO Ground OV dd s D 21 22 Write Data When active this signal writes to the disk media Data is written on the falling edge of the encoded data pulse This signal is active low 1999 megatel computer corporation PC II amp PC II i Technical Manual MA990734 1 00e Page 37 2 40 SCSI Interface The PC II amp PC II i utilize the 5380 SCSI compatible Controller to provide a SCSI interface The SCSI port uses pins A23 to A30 and B23 to B31 of the 96 pin Eurocard Connector J1 The SCSI Controller I O Address is 2BOh to 2BFh Interrupt IRQ15 and DMAO The PC IT amp PC I
6. YO f Ground 0V Power 12V Notes Pins not listed are not connected There is a 3 1 2 floppy styled power connector on the QTB 104 and on the QTB 104AT which allows the connection of AUI power of 12V and GND 1999 megatel computer corporation PC II amp PC II i Technical Manual MA990734 1 00e Page 47 4 00 Flashd Non Volatile On board Solid State Disk The custom PC H amp PC IT i can be configured with a 1MByte or 2MByte non volatile Solid State Disk All required programming voltages are provided on board Reading and writing to the disk is accomplished with megatel drivers Note For the procedure on programming the on board solid state disk please read the READ ME file on the Megatel PC II PC II i Distribution Diskette PC II amp PC II i Technical Manual 1999 megatel computer corporation Page 48 MA990734 1 00e 5 00 I O Addresses Standard I O Map T O Device Function in Hex 0000 000F DMA Controller 1 0010 001F Aliased 0020 002F Interrupt Controller 1 0030 003F RESERVED 0040 004F Timer 0050 005F Aliased 0060 006F Keyboard amp System Control 0070 0071 RTC Control and Data Port 0072 0073 RESERVED 0074 COM4 0075 007F RESERVED 0080 008F DMA Page Registers 0090 009F RESERVED 00A0 00BF Interrupt Controller 2 00C0 00DF DMA Controller 2 00E0 00EF PC BUS 00F0 00FF RESERVED 0100 016F PC BUS 0170 017F RESERVED 0180 01EF PC BUS 01F0 01FF RESERVED 0200 0277 PC BUS 0278 027F Parallel Prin
7. standards 802 3 compliant AUI and TPE 10BASE T Supports Color flat panels ie TFT amp STN serial interfaces Supports panels from popular Automatic switching between AUI and manufacturers such as Sharp amp Seiko TPE ports 64KBytes local DRAM SCSI CONTROLLER 16 bit I O accesses local DRAM with 5380 compatible SCSI controller zero added wait states ASPI compatible software drivers included Standard IBM PC AT Hard Disk BIOS MISCELLANEOUS support via SCSI port INT 13h Only 100mmx100mm 4 x4 Complete interface for SCSI Requires only 5V operation compatible hard drives Power consumption of 6 Watts typical for Multi media software supports CD ROMs 33MHz board with 4MBytes DRAM audio devices and optical storage MTBF Not less than 200 000 hours PC II amp PC II i Technical Manual 1999 megatel computer corporation Page 8 MA990734 1 00e 1 20 General System Notes Power Supply The PC II amp PC IT i use 5V 5 The voltage Rise time should be from 2V to 5V within 10ms Reset The Reset line found at J1 pin 31A 96 pin eurocard connector should be driven by an open collector or mechanical switch Bus Drive Current All Bus signals except for the BS16 signal can be driven with devices capable of providing 4mA sink current BS16 signal can be driven with devices capable of providing 10mA sink current Note The BS16 signal is equivalent to the IOCSI6 and MEMCSI6 signal Bus Terminat
8. synchronous with the system clock and has a duty cycle of 50 continued on next page PC II amp PC II i Technical Manual 1999 megatel computer corporation Page 18 MA990734 1 00e 1 72 64 pin8 bit Bus Pinout J2 continued Symbol Type Name and Function Address Latch Enable This signal is used to latch valid addresses and memory decodes from the microprocessor When used with AEN this signal is available to the I O channel to indicate valid microprocessor or DMA addresses ALE is an active high signal and microprocessor addresses are latched on the falling edge high to low of the ALE signal Terminal Count A pulse is put on this line to indicate that the current DMA transfer has reached the terminal count This signal is active high REFRESH Refresh This signal is used to refresh dynamic ram and can be driven by a microprocessor on the I O channel This signal is active low In the traditional PC XT architecture this channel is also known as DACKO DMA Acknowledge 1 amp 3 Spare DACKI amp DACK3 are used to acknowledge DMA requests which notifies the individual peripheral it has been granted a DMA cycle These lines are active low DMA Acknowledge 2 Floppy DACK2 is used to acknowledge DMA requests which notifies the individual peripheral it has been granted a DMA cycle This line is active low DMA Request Line 1 and 3 Spare These lines are individual asynchronous channel request lines in
9. 0 51 0 225 5 72 3 400 86 36 0 325 8 26 0 200 5 08 0 100 2 54 0 010 0 25 1 575 40 01 0 163 4 14 1 462 37 13 0 100 2 54 0 190 4 83 0 805 20 45 1 320 33 54 3 775 95 89 3 850 97 79 0 400 10 16 0 300 7 62 3 400 86 36 3 000 76 20 O Le lt gt D1 0 110 2 79 dia D2 0 035 0 89 dia Where applicable measurements are taken Centre Line Measurements within are in mm continued on next page PC II amp PC II i Technical Manual 1999 megatel computer corporation Page 54 MA990734 1 00e 7 00 PC II amp PC II i Mechanical Specifications cont d D 0 100 2 54 83 82 0 200 5 08 67 31 0 300 7 62 3 375 85 73 0 435 11 05 0 132 3 35 0 240 6 10 regular header E 0 062 1 57 0 410 10 41 stack through F 0 435 11 05 stack through 0 435 11 05 Where applicable measurements are taken Centre Line Measurements within are in mm 1999 megatel computer corporation PC II amp PC II i Technical Manual MA990734 1 00e Page 55 8 00 References AT BUS DESIGN IEEE P996 compatible Edward Solari Published by Annabooks 12145 Alta Carmel Court suite 250 San Diego CA 92128 copyright 1990 by Annabooks ISBN 0 929392 08 6 The programmer s PC sourcebook Thom Hogan 2nd ed Published
10. 28 MA990734 1 00e 2 10 Video Interface The Video Interface on the PC H amp PC IT i utilizes the Chips 65530 Video Controller This interface is compatible with the IBM PS 2 Video Graphics Array VGA The VGA Controller I O Address is 03BOh 03DFh and utilizes IRQ2 IRQ9 The Video Interface includes a separate 512KByte of Read Write memory called the Display Buffer or Character generator video RAM in which the data to be displayed is stored The Display Buffer is normally mapped into the CPU s address space at 0A0000h to OBFFFFh Note Configurations using 256KByte or IMByte instead of the standard 512KByte is available The display controller incorporates high speed Local Bus Interface for improved performance Optionally the display memory may be linearly mapped in the private local bus memory space above the normal ISA 16MByte boundry 2 11 LCD Control megatel s PC II amp PC IT i are unique in that they provide direct full panel LCD control as an integral part of the on board video functions Some of the features which are part of the Chips 65530 video controller chip are as follows IBM VGA and Register level compatibility s Enhanced backward compatibility to EGATM CGA Hercules and MDA standards e Interlaced and non interlaced CRT Displays with resolutions of up to 1024x768 with 16 colors a resolution of 800x600 with up to 256 colors can be connected to the PC II amp PC II i s
11. 8 bit ISA or 16 bit Bus interface 1 13 PC IT i General Specifications CPU amp MEMORY INPUT OUTPUT Intel486 SL Microprocessor On board 8 bit ISA or 16 bit Bus Expansion 25MHz or 33MHz CPU clock frequency Standard IBM PC Keyboard port Built in 8K Cache floating point unit 8 bit general purpose Parallel Port Full 32 bit DRAM Data Bus 2 IBM compatible RS 232C Serial ports 486DX compatibility amp performance 1 BIOS compatible RS 232C serial port AT compatible BIOS and Architecture Txdata Rxdata to a BIOS interface Up to 256KByte BIOS in Flash EPROM Independent software selectable BAUD rates 4MByte or 16MByte User DRAM Voltage converter for serial voltages PC 104 Bus Compatible option with Adapter AT Real time clock with Battery Back up ISA Bus Compatible option with Adapter M Systems Flash File System SOLID STATE DISK FLOPPY DISK CONTROLLER On board 2MByte solid state disk typical CMOS Floppy Disk Controller megatel drivers for reading amp writing eCan drive 360KByte 720KByte 1 2MByte or 1 44MByte capacity drives VGA VIDEO CONTROLLER support up to two drives Supports Analog VGA SVGA Monitors Will boot standard versions of PC and LCD EL amp Gas Plasma displays MS DOS and DR DOS Up to 512KB Video DRAM Enhanced backward compatibility NETWORK with EGATM CGATM Hercules On board Ethernet LAN Local Area Network amp MDA
12. 802 3 compliant AUI and TPE 10BASE T SCSI CONTROLLER serial interfaces ASPI compatible SCSI controller Automatic switching between AUI and Standard IBM PC AT Hard Disk BIOS TPE ports support via SCSI port 64KBytes local DRAM Complete interface for SCSI 16 bit I O accesses local DRAM with compatible hard drives zero added wait states Multi media software supports CD ROMs audio devices and optical MISCELLANEOUS storage Only 100mmx100mm 4 x4 Requires only 5V operation SOLID STATE DISK Power consumption less than 5 Watts On board 2MByte solid state disk typical megatel drivers for reading amp writing 1999 megatel computer corporation PC II amp PC II i Technical Manual MA990734 1 00e Page 7 1 12 Introduction to the PC II i The PC IT i is a surface mounted single board computer based on the Intel486SL microprocessor and the Intel 82360SL I O Subsystem It features up to 16MBytes of on board user DRAM protected mode up to 256KByte BIOS in Flash EPROM on board 2MByte Solid State Disk a graphics display controller supporting color LCD panels and analog VGA SVGA monitors a floppy disk controller two full IBM compatible RS 232 serial communication ports a partial RS 232 Serial port used via BIOS calls an Ethernet Local Area Network 802 3 compliant AUI amp TPE 10BASE T signal interfaces one parallel printer port a serial keyboard port a real time clock calandar with battery back up and an
13. Checksum High Byte for registers 10h 2Dh Expanded Memory Size Low Byte Expanded Memory Size High Byte Date Century Byte Information Flags Reserved Equipment Byte Extended Reserved Reserved LCD Signature Reserved LCD Type Byte Reserved Reserved Reserved Note When using the Direct Edit of the CMOS RAM SETUP only registers 10h to 7Fh are accessible 1999 megatel computer corporation PC II amp PC II i Technical Manual MA990734 1 00e Page 15 1 70 64 pin 8 bit ISA Bus Interface J2 The PC II amp PC II i Bus interface provides a quick route for adding a variety of standard I O functions while keeping the complexity and physical size of the system to a minimum OEM users who are designing their own special purpose I O functions may find it convenient to use the PC I or PC I i Bus interface Note IO cycles with BS16 selected as a 16 bit bus must be qualified with IOR and IOW OR with the top bits A15 to A19 addressing 00000hex see 16 bit Bus Expansion chapter The 8 bit ISA Bus connector J2 found on the standard PC HI amp PC II i is that of a 64 pin dual row header 2x32 on 0 100 2 54mm spacing The last 62 pins of J2 pins A1 to A31 and BI to B31 correspond to the PC Bus interface The 8 bit ISA Bus connector found on the custom PC II amp PC II i is that of a 62 pin male edge connector WARNING The following signals used on the PC H amp PC II i 8 bit Bus are NOT
14. Solder bottom Side 00000000000000000000000000000000 00000000000000000000000000000000 0000000000 O gt Hor O Pinl 01999 megatel computer corporation PC II amp PC II i Technical Manual MA990734 1 00e Page 51 6 20 PC II i Parts List B PC II i Note Two resistors may be used instead of one single resistor PC I1 amp PC II i Technical Manual Page 52 B D D D F J J J J R R R R R R R R R T U U U U U U U U U U U U U U U U U U U U BATT 220 104 106 BAV74 BAV99 LED G FL1046 96MR ADIN 2x32 1x10 2x5 270 5612 750 78RO 182R0 100R0 221 102 104 ST7033 82486SL 82360SL MT4C4M4B1 E28F020 E28F008 F28F008 ICD2051 2064 37C65 5380 14C88 1489 7660 65530 LT1086CT 3 3 MT4C4256 MT4C4001J 74HC32 T4AC08 662 1 1 3 2 2 2 2 1 7 7 1 1 1 1 4 1 1 1 1 1 1 1 2 3 1 1 1 5 4 1 1 1 PC II i PCB 3 0V Lithium Battery 22pf Capacitors 40 0 1uf Capacitors 13 10pf Capacitors Dual diode series Dual diode common cathode Floppy Disk Controller SCSI Controller RS 232 Drivers RS 232 Receivers Voltage Converter Video Controller 1 5A 3 3V Voltage Regulator 256Kx4 DRAM if installed or 8 1Mx4 DRAM if installed 2 input OR Gate 2 input AND Gate 12V Flash Ch
15. Symbol PinNo Type Name and Function __ ANRED Analog Red signal ANBLUE Analog Blue signal ANGRN Analog Green signal VSYNC Vertical sync signal HSYNC Horizontal sync signal VIDEO GND Video Ground BLUE Primary Blue signal GREEN Primary Green signal RED Primary Red signal SB Secondary Blue signal Monochrome SG Secondary Green signal Intensity SR Secondary Red signal VSYNC Vertical sync signal HSYNC Horizontal sync signal VIDEO GND Video Ground S OOO VIDEO GND Using VGA 65530 Video Controller with STN LCD s See Chart 1 next page Panel display data Bottom screen y O Panel display data Bottom screen P2 Panel display data Bottom screen P3 Panel display data Bottom screen P4 Panel display data Top screen P5 Panel display data Top screen Panel display data Top screen Panel display data Top screen Panel AC signal Scanning start signal for panel Data latch clock for panel Shift clock for panel VIDEO GND Video Ground P6 P7 M FRM LC SCK VIDEO GND S OOO mal PC II amp PC II i Technical Manual 1999 megatel computer corporation Page 32 MA990734 1 00e Chart 1 Common Interfaces pin assignments and Settings Below are commonly used Panel amp CRT interfaces and settings Signals Signals Color Color CRT Available Available i Signalsi From with i Extended 16 bit PC II amp megatel PC U i Video Eurocard Adapter PO P
16. range is 40 C to 60 C and the Self discharge is less than 1 per year at 25 C It is intended for use with the Real Time Clock only 1 62 Real Time Clock Interrupt 1AH The PC II amp PC IT i support the Interrupt 1AH AT compatible clock functions CLKGET amp CLKPUT are two other real time clock functions that are implemented on the PC H amp PC IT i accessible through INT1AH Prior To INT1AH Upon Return from INTIAH CLKGET AH FEH AL Value in real time clock register DL register DH 1DH NOTE register specify real time clock register CLKPUT AH FFH No values returned DL register DH 1CH AL value NOTE register specify real time clock register value specify value to go into register PC II amp PC II i Technical Manual 1999 megatel computer corporation Page 14 MA990734 1 00e 1 63 Real Time Clock Memory Map Control Status 100ths of a Second Seconds Minutes Hours Year Century Month Day Timer Reserved for Alarm Control Reserved for Alarm Registers or Ram Status Registers A B C D Diagnostic Status Byte Shutdown Status Byte Floppy Drive Type Byte Reserved Fixed Drive Type Byte Reserved Equipment Byte Base Memory Size Low Byte Base Memory Size High Byte Expanded Memory Size Low Byte Expanded Memory Size High Byte Drive C Fixed Drive Type Extended Byte Drive D Fixed Drive Type Extended Byte Reserved Reserved Checksum Low Byte for registers 10h 2Dh
17. signal is active low 16 Initialize Printer This signal uses a 50 microsecond pulse minimum to initialize the 15 4 printer This signal is active low Error When this signal is active it indicates an error has been encountered This signal is active low 1 Strobe Clocks data to the printer with a 0 5 microsecond minimum pulse This signal is active high Valid data must be present for a minimum of 0 5 microseconds prior to and after the strobe pulse 1 Auto Feed XT When active it causes the printer to line feed after a line is printed This line is active low GND C1 C32 T O Ground OV 24 25 1999 megatel computer corporation PC II amp PC II i Technical Manual MA990734 1 00e Page 35 2 30 Floppy Disk Interface The Floppy Disk interface of the PC II amp PC II i uses the WD37C65 Floppy Disk Controller chip together with custom logic for write data pre compensation drive and motor select functions With the standard BIOS software one or two double density single or double sided 5 25 inch or 3 5 inch floppy disk drives can be connected DMA Channel 2 is used in conjunction with data transfers between the main memory of the PC II amp PC IT i and the 37C65 The interrupt output from the 37C65 drives IRQ6 and the floppy adapter occupies I O Addresses 3F0h 3F7h A total of 4 outputs are available for drive select DSEL and motor select MTR functions Normally the DSELO and DSELI output
18. 1999 megatel computer corporation Page 36 MA990734 1 00e 2 31 96 pin Eurocard Connector Floppy Disk Section dii n TT YE TRKO C19 di f Disk Changed When active this signal indicates that the drive door is open or that the diskette has been changed since the last drive selection This signal is active low Head Select This signal selects the head side of the floppy disk that is being read or written When high it selects side 0 and when low it selects side 1 This signal is active low Read Disk Data When active this signal reads data from the disk media Data is read on the falling edge of the encoded data pulse This signal is active low Write Protect This signal senses the status from the disk drive and when active indicates that the disk is write protected This signal is active low Track 0 This signal senses the status from the disk drive and when active indicates when the head is positioned over the track 0 This signal is active low Write Enable Just prior to writing on the diskette this line becomes active to allow current to flow through the write head This line is active low ISTP 224 A i LE a E 10 Step Pulse This signal issues an active pulse to move the drive head from track to track This signal is active low Direction This signal determines the direction of the head stepper motor When this signal is high the direction is outward When this signal is low the direction is inward
19. ACE that it is ready to transmit data This signal is active low Receive Data Sin Serial Input This signal serially receives data from the communications link Data Set Ready This signal is used by the remote device to indicate that it is ready to establish a link and transfer data with the ACE This signal is active low Data Carrier Detect RLSD Receiver Line Signal Detect When this signal is active it indicates that the local set has detected a data carrier or signal which meets its signal quality conditions This signal is active low CI I O Ground OV C32 1999 megatel computer corporation PC II amp PC II i Technical Manual MA990734 1 00e Page 41 2 54 96 pin Eurocard Connector Com2 RS 232 Section Com2 Ring Indicator When this signal is active it indicates that a ringing signal is being received by the Modem or Data set Symbol Ro a Data Terminal Ready When this signal is active it indicates that the Com port is ready to receive This signal is active low Clear To Send When this signal is active it indicates that the remote device is ready to transmit This signal is active low o Transmit Data Sout Serial Output This signal serially transmits data to the communication link This signal is set to a logic level 1 upon a Master Reset Com2 Reguest To Send When this signal is active it indicates that the Asynchronous Communication Element ACE that it is ready
20. ER 2 output can be read at Port 061h bit 5 The Speaker output SPKR is pin A9 of the 96 pin eurocard connector J1 It is intended to drive a piezo electric audio transducer connected between the SPKR pin and ground PC II amp PC II i Technical Manual 1999 megatel computer corporation Page 12 MA990734 1 00e 1 60 Real Time Clock 1 61 Real Time Clock General Information The Real time Clock RTC on the PC HI amp PC IT i is part of the Intel 82360SL The RTC section also uses a 32 768 kHz crystal and a 3 0V Lithium battery The battery is soldered onto the circuit board Features of the clock chip include e 128 Bytes battery backed up CMOS RAM e Low standby current SuA 3 0V e Four Year Calendar e 24 or 12 Hour Format e Automatic word addressing incrementing e Programmable alarm timer and interrupt function The clock comes set at proper date and time from the factory for North American EST The software for the clock is included as part of the BIOS with boards containing the Real Time Clock option Standard features of the RTC option include both leap year and year changeover The DOS clock is updated automatically by the RTC upon Boot Up Should you change the time or date in DOS the PC H amp PC II i will conversely update the RTC chip The PC H amp PC IT i uses standard DOS instructions to change the time and the date If you are using standard DOS where the time and date is displayed upon boot up you
21. Header Symbol Name and Function No BASE T JDE15 Negative CLSN This is the negative input toa differential amplifier connected to the CLSN pair of the AUI cable Collision In B Positive CLSN This is the positive input to a differential amplifier connected to the CLSN pair of the AUI cable Collision In A Receive Data Active low Manchester Encoded data received from the twisted pair Receive Data Active high Manchester Encoded data received from the twisted pair Negative RCV The negative input to a differential amplifier connected to the RCV pair of the AUI cable Data In B Itis driven with 10Mb s Manchester Encoded data Positive RCV The positive input to a differential amplifier connected to the RCV pair of the AUI cable Data In A It is driven with 10Mb s Manchester Encoded data Transmit Data Invert Twisted Pair Output Driver Active low Manchester Encoded data with embedded pre distortion information to be transmitted onto the twisted Transmit Data Twisted Pair Output Driver Active high Manchester Encoded data with embedded pre distortion information to be transmitted onto the twisted pair Negative TRMT Negative side of the differential output driver pair that drives 10Mb s Manchester Encoded data on the TRMT pair of the AUI cable Data Out B ositive TRMT Positive side of the differential output iver pair that drives 10Mb s Manchester Encoded data n the TRMTpair of the AUI cable Data Out A
22. I i also uses software drivers to enable the use of SCSI hard drives as well as other audio and optical storage devices such as CD ROMs This SCSI interface is ASPI compatible Note For more information regarding the software and formatting please refer to your SCSI Software Guide and the READ ME file on the Megatel PC II PC II i Distribution Diskette PC II amp PC II i Technical Manual 1999 megatel computer corporation Page 38 MA990734 1 00e 2 41 96 pin Eurocard Connector SCSI Section A23 124 8 2 T O Bi directional Data Bus Data is input on these lines during the I O read cycle and is output on these lines during an I O write cycle A29 A30 12 13 These data lines are active low S Bi directional Data Bus Parity Data parity is odd This signal is active low ATN AKN RST Attention Indicates an attention condition This signal is received in the Target role and is driven by an Initiator This signal is active low Busy When active this signal indicates that the SCSI Bus is being used It can be driven by both the Initiator and the Target device This line is active low Acknowledge When driven by an initiator indicates acknowledgement of a REQ AKN data transfer handshake As the Target this signal is received as a response to the REQ signal This signal is active low SCSI Bus Reset When this signal is active it indicates a SCSI Bus RESET condition This signal is activ
23. LCD EL and Plasma panels with resolutions of 640x200 640x400 640x480 800x600 1024x768 1280x1024 can be connected to the PC I amp PC I i e Up to 64 level gray levels on monochrome LCD EL and gas plasma panels e Up to 185 193 colors on color TFT LCD EL and gas plasma panels and up to 226 981 colors on color STN LCD panels s A single screen panel or dual screen panel panels that are split into top and bottom halves can be driven e Data can be sent to the panel in parallel 4 bits or 8 bits at a time or in series 16 bit data can be sent when using the megatel Video Paddle Board e Vertical and Horizontal Compensation of displayed text or graphics images on a flat panel e SMARTMAP intelligent color to gray scale conversion e Programmable polynomial based Frame Rate Control grey scale algorithm supports fast response mouse quick displays by reducing flicker without increasing panel vertical refresh rate e Integrated RAMDAC Note For more information on the Video Paddle Board please see the PC v amp PC II Series Products User s Manual 1999 megatel computer corporation PC II amp PC II i Technical Manual MA990734 1 00e Page 29 2 12 LCD Driver Files An LCD EL or Gas Plasma display is to the PC H amp PC II i CMOS RAM SETUP considered a Special Display Type To use one of these displays a software driver must be used to initialize or set the Chips 65530 video controller registers to the values which
24. MA requests 12V which notifies the individual peripheral it has been granted a DMA cycle These lines are active low In the traditional XT and AT this pin was used for 12V or unused IDACK6 amp DACK7 are logically ANDED together to generate DACK16 IRQ10 Interrupt Request 10 Spare IRQ10 is No Longer an asynchronous input used to request 5V interrupt service An interrupt request is executed by raising IRQ10 low to high and holding it high until it is acknowledged edge triggered mode or holding IRQ10 at a high level until it is acknowledged level triggered mode This line is active high In the traditional XT architecture this channel is used for 5V In the traditional AT architecture this channel is unused 1999 megatel computer corporation PC II amp PC II i Technical Manual MA990734 1 00e Page 23 Notes PC II amp PC II i Technical Manual 1999 megatel computer corporation Page 24 MA990734 1 00e 1 80 16 bit Bus Expansion Interface J3 The PC II amp PC II i also provide an expansion to a 16 bit Data Bus interface in the form of the additional 10 pin single row header strip J3 1x10 on 0 100 2 54mm spacing Note I O cycles with BS16 selected as a 16 bit bus must be qualified with IOR and IOW OR with the top bits A15 to A19 addressing 00000hex Bus Termination Option AC Bus termination provides termination close to the characteristic impedance of the signal line without ex
25. NLO PI PNLI P2 PNL2 P3 PNL3 14 PNL4 15 PNL5 P6 PNL6 P7 PNL7 LPO PNL8 LP1 PNL9 LP2 PNL10 LP3 PNL11 LP4 PNL12 LPS PNL13 LP6 PNL14 LP7 PNL15 P8 10 P10 P11 SCK M FLM LP Notes These are the starting signal names of the pack t These are Latched PO to P7 signals using SCK active high edge Not all of these signals are used at one time This page is an altered excerpt from page 164 of the CHIPS 65520 530 High Performance Flat Panel CRT VGA Controllers Data Sheet Preliminary November 1992 1999 megatel computer corporation PC II amp PC II i Technical Manual MA990734 1 00e Page 33 2 20 Parallel Printer Port The PC II amp PC II i bi directional Parallel Printer Port is part of the Intel 82360SL chip which is compatible with the standard PS 2 style printer interface The IEEE STD1284 standard signaling method for a bi directional parallel peripheral interface for personal computers is used The printer port uses Pins A10 A22 and B19 B22 of Eurocard Connector J1 8 data lines 5 status inputs and 4 control outputs The status inputs can be read from bits 3 to 7 of I O Port _379h The control outputs are set by writing to Bits 0 3 of D Port 37Ah and can also be read back to determine the actual logic levels on the outputs as opposed to the logic values written to Port 37Ah The control lines are open collector outputs with internal 4 7kQ pu
26. Plasma displays the following table lists some of the compatible signal names used by various panel manufacturers For a more complete listing of compatible signal names please read the 65530 LCD Manual formerly entitled the PC II LCD Manual CP2 CK CKDT CLOCK CP1 LP CLI LOAD LP YSCL HSYNC S YD VSYNC UD3 to UDO HD3 to HDO UD3 to UDO UD3 to UDO DATA 03 to DATA 00 LD3 to LDO LD3to LDO LD3 to LDO LD3 to LDO DATA E3 to DATA E0 XCLK RO to R2 M M H D ENAB DISPTMG Note May not always be the case please refer to the manufacturers specifications tNote Unless used with the Video Paddle Board the SCK signal has to be inverted by user Note The PC II amp PC II i come with the M signal available The PCIII amp PCIII i would have to be specially ordered to have the Blank signal available INSTEAD of the M signal Note The PC II amp PC III i come with the ENAVEE Enable VEE signal available at the P8 pin The PC TI amp PC II i would have to be specially ordered to have the P8 signal ie a TFT LCD s RO signal available at this pin INSTEAD of the ENAVEE signal 2 14 LCD Portion of RTC Memory Map Register Addresses FUNCTION Reserved LCD Signature Reserved LCD Type Byte 1999 megatel computer corporation PC II amp PC II i Technical Manual MA990734 1 00e Page 31 2 15 96 pin Eurocard Connector Video Section Using VGA 65530 Video Controller with VGA Monitor
27. Power pins PC II amp PC II i PC II amp PC IT i 8 bit Old XT or AT J2 Pin Bus Name Signal Name BS IRQ10 5V B7 IDACK16 12V B9 IRQ14 DRQI6 12V Bus Termination Option AC Bus termination provides termination close to the characteristic impedance of the signal line without exceeding the DC output current capabilities of the drivers This increases data integrity and system reliability A resistor capacitor network of 40 60 ohms in series with 30 70pF can be connected between each bus signal and ground Bus Drive Current All Bus signals except for the BS16 signal can be driven with devices capable of providing 4mA sink current The BS16 signal can be driven with devices capable of providing 10mA sink current Note The BS16 signal is equivalent to the IOCS16 and the MEMCS16 signal For Bus timing please refer to the References section of this manual PC II amp PC II i Technical Manual 1999 megatel computer corporation Page 16 MA990734 1 00e 1 71 64 pin8 bit Bus Header Pinout J2 J2 BEB BRP Pin AO WARNING Some of these signals USED TO BE power pins DO NOT CONNECT POWER TO THESE PINS PC Bus PC II i Name J2 5V GND RESET 5V IRQ2 IRQ10 DRQ2 DACK16 0WS IRQ14 DRQ16 GND IMEMW MEMR HOW NOR IDACK3 DRQ3 DACK1 0801 REFRESH CLK IRQ7 IRQ6 IRQS 1999 megatel computer corporation PC II amp PC II i Tec
28. ady to transmit This signal is active low Transmit Data This line Transmits Data serially Request To Send When this signal is active it indicates that the Com port is ready to send data This signal is active low RS 232 Receive Data This line Receives Data serially Data Set Ready This signal is used by the remote device to indicate that it is ready to send data This signal is active low Data Carrier Detect When this signal is active it indicates that the local set has detected a data carrier signal This signal is active low PC II amp PC II i Technical Manual 1999 megatel computer corporation Page 44 MA990734 1 00e 2 70 Other I O Pinouts amp Descriptions 2 71 96 pin Eurocard Connector Reserved Pins Symbol Name and Function RESERVED RESERVED DO NOT USE RESERVED RESERVED DO NOT USE 2 72 96 pin Eurocard Connector Power Supply Section Symbol Name and Function B1 B32 5V 5 0 GND C1 C32 I Ground OV BS C29 Note The voltage Rise Time should be from 2V to 5V within 10ms 1999 megatel computer corporation PC II amp PC II i Technical Manual MA990734 1 00e Page 45 3 00 ISA High Integration Ethernet Controller The Intel 82595 Ethernet Controller is a highly integrated LAN Local Area Network controller that is used in networking applications The PC II amp PC II i pulls the Attachment Unit Interface AUD port signals and the Twisted Pair Ethernet TPE por
29. al port used via BIOS calls an Ethernet Local Area Network 802 3 compliant AUI amp TPE 10BASE T signal interfaces one parallel printer port a serial keyboard port a real time clock calandar with battery back up and an 8 bit ISA or 16 bit Bus interface 1 11 PC II General Specifications CPU amp MEMORY INPUT OUTPUT eIntel386 SL Microprocessor On board 8 bit ISA or 16 bit Bus Expansion 25MHz CPU clock frequency Standard IBM XT Keyboard port Static Intel386 CPU core IBM compatible bi directional Parallel Port AT compatible BIOS and Architecture 2 IBM compatible RS 232 Serial ports Up to 256KByte BIOS ROM el RS 232 Serial subsystem Up to 10MByte User DRAM Txdata Rxdata amp BIOS Interface AT Real time clock amp Battery Back up VGA VIDEO CONTROLLER Supports Analog VGA SVGA Monitors FLOPPY DISK CONTROLLER and LCD EL amp Gas Plasma displays CMOS Floppy Disk Controller Up to 512KB Video DRAM eCan drive 360KByte 720KByte 1 2MByte Enhanced backward compatibility or 1 44MByte capacity drives with EGA CGA Hercules support up to two drives amp MDA standards Will boot standard versions of PC Supports Color flat panels ie TFT amp STN MS DOS and DR DOS Supports panels from popular manufacturers such as Sharp NETWORK Densitron and Seiko Epson On board Ethernet LAN VGA Register Set Compatible Local Area Network
30. arge Pump 96 pin DIN Eurocard Connector 64 pin Bus Header 10 pin Bus Extension Strip 20 pin Ethernet Header 10 270 Resistors 5 56 20 Resistors 1 759 Resistors 5 78Q Resistors 1 1820 Resistors 1 100Q Resistor 1 220Q Resistor 5 1KQ Resistor 5 10KQ Resistor 5 Isolated Transformer Microprocessor SuperSet ISA Peripheral I O SuperSet Subsystem or 8 4Mx4 DRAM if installed 2Mbit 256KB Flash ROM 8Mbit 1MB Flash ROM if installed 8Mbit 1MB Flash ROM if installed Dual Programmable Clock Oscillator 1999 megatel computer corporation MA990734 1 00e 6 21 PC IT i Paris Layout J 1509 8 80486SL ione 0 soc LT1086 PC II i Parts Layout for the Component top Side 3 o 0 o q MWANAE Sjee N uN Leena hee QUA LATIN DIE F 281008 28008 008 00000 00000 0000000000 00000000000000000000000000000000 B 00000000000000000000000000000000 886 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 O gt O or O Pinl 1999 megatel computer corporation MA990734 1 00e 0000000000 PC II i Parts Layout for the Solder bottom Side PC II amp PC II i Technical Manual Page 53 7 00 PC II amp PC I i Mechanical Specifications l i 0 010 0 020
31. by Microsoft Press A Division of Microsoft Corporation One Microsoft Way Redmond Washington 98052 6399 copyright 1991 by Thom Hogan ISBN 1 55615 321 X PC II amp PC II i Technical Manual 1999 megatel computer corporation Page 56 MA990734 1 00e 9 00 megatel Service Procedure If you feel your board requires service megatel s Service Department will do all it can to get you up and running quickly If you purchased your board from our Distributor Our Distributors are technically capable to help you get back on track Since your proof of purchase is from one of our Distributors you will have to return your board to them Please follow their instructions for returning your board for service If you purchased your board directly from megatel Place a Call or Fax to megatel s Service Department prior to shipping to receive your RMA Return Materials Authorization Number Boards that do not have RMA s will not receive priority To receive an RMA you will be required to provide the following information 1 Company Name 2 Board Model Number amp Serial Number 3 Description of Problem 4 Purchase Order Number Special Shipping Instructions Along with the information requested on the megatel SERVICE FORM follows these shipping instructions please include the following on one of your commercial invoices 1 The value of the board s this value must match the invoice s we sent with the board 2 A copy of th
32. ceeding the DC output current capabilities of the drivers This increases data integrity and system reliability A resistor capacitor network of 40 60 ohms in series with 30 70pF can be connected between each bus signal and ground Bus Drive Current All Bus signals except for the BS16 signal can be driven with devices capable of providing 4mA sink current The BS16 signal can be driven with devices capable of providing 10mA sink current Note The BS16 signal is equivalent to the IOCS16 and MEMCS 16 signal For Bus timing please refer to the References section of this manual 1999 megatel computer corporation PC II amp PC II i Technical Manual MA990734 1 00e Page 25 1 81 16 bit Bus Header Pinout J3 fra PC II amp PCII i PC Bus Name J3 Din No 6 2 10 pin 16 bit Bus Expansion Pinout J3 Bus Select 16 This signal indicates that an ISA bus peripheral wishes to execute a 16 bit I O cycle This signal has an active pull up so when not driven the default T O bus cycle is 8 bits This signal is active low Bi directional Data Bus Data is input on these lines during memory I O and interrupt acknowledge read cycles Data is output on these lines during memory and I O write cycles These lines are active high System Byte High Enable This signal indicates that data is being transferred on the upper byte of the 16 bit data bus D8 to DIS This signal is active low
33. correspond to the display being used The PC H amp PC II i BIOS contains Generic LCD Software Drivers in the form of a Table that allow many of the popular LCD EL and Gas Plasma displays to be used An LCD Driver File List which contains our current list of Hex Settings Panel Manufacturers and Pinouts can be found in the 65530 LCD Manual formerly entitled the PC IJ LCD Manual WARNING It is the user s responsibility to check for correctness in pinout To implement one of the LCD Software Drivers one must use the CMOS RAM SETUP One of the fields in the CMOS RAM SETUP is the Display Type This should be set to Special when using an LCD EL or Gas Plasma Display A new field should appear beside the selected Special setting Scroll through this field until you have reached the desired two digit Hex Settingf tNote Be sure to save these settings when exiting the CMOS RAM SETUP Intelligent dot matrix LCD panels do not require the same type of software drivers as do the LCD EL and Gas Plasma displays These types of panels are used via the printer port and with an ASCII software program can output your message etc Note For more information regarding the CMOS RAM SETUP please see Real Time Clock chapter PC II amp PC II i Technical Manual 1999 megatel computer corporation Page 30 MA990734 1 00e 2 13 Some Compatible LCD Signal Names Since there are no standard signal names for LCD EL and Gas
34. ctive low Reset Drive Reset Drv indicates that a reset conditon is in progress This signal is active high and is synchronized to the falling edge of CLK VCC Externally supplied 5V AO BI GND Power return of power supply 1 The following pin assignments are NO L NGER USED AS POWER PINS DO NOT APPLY POWER TO THESE PINS Interrupt Request 14 Spare IRQ14 is an asynchronous input used to request interrupt service An interrupt request is executed by raising IRQ14 low to high and holding it high until itis acknowledged edge triggered mode or holding IRQ14 at a high level until it is acknowledged level triggered mode This line is active high In the traditional AT architecture this channel is used by the IDE fixed disk DMA Request Line 16 IRQ14 DRQ6 DRQ7 are hardwired together as DRQI6 continued on next page PC II amp PC II i Technical Manual 1999 megatel computer corporation Page 22 MA990734 1 00e 1 72 64 pin8 bit Bus Pinout J2 continued Some of the following pin assignments are NO LONGER USED AS POWER PINS DO NOT APPLY POWER TO THESE PINS Name and Function Zero Wait States In the traditional XT No Longer architecture this pin was used for Card Card Select Select In the PC II PC II i and traditional AT architecture this pin is used for OWS zero wait states This pin is active low IDACK16 DMA Acknowledge 16 Spare DACK16 No Longer is used to acknowledge D
35. d to MASTER Note Inputs Interrupt 14 amp DRQ6 amp DRQ7 are hardwired together as DRQ16 Outputs DACK6 amp DACK7 are logically ANDED to generate DACK16 Overall Note Since devices tied to Interrupt lines normally Tri State their outputs Interrupts may be shared if the interrupt handler is written to determine which device actually generated an interrupt 1999 megatel computer corporation PC II amp PC II i Technical Manual MA990734 1 00e Page 11 1 50 Interval Timer The PC II amp PC IT i utilize the Intel 82360SL to provide 8254 compatible Programmable Timer Counters Timer 0 Timer 1 amp Timer 2 are clocked by a 1 193MHz clock resulting in a minimum timing resolution of 838ns The Gate inputs for Timer 0 and Timer are tied high The Gate inputs for Timer 2 are controlled by the Timer 2 Gate Bit which is Bit 0 of Port 061h The output from Timer 0 is connected to interrupt input IROO on the Interrupt Controller This timer is used by the operating system for its internal real time clock The output from Timer 1 is used to generate a CPU Hold Request when it is time for a refresh cycle Timer 2 is used to generate signals for the Speaker output The Timer 2 output is gated with the SPEAKER DATA bit bit 1 of Port 061h to drive the SPKR output The combination of the Timer 2 Gate control bit and the SPEAKER Data bit allow complex waveforms to be generated on the Speaker output The state of the TIM
36. e invoice s we sent with the boards Proof of Purchase 3 Be sure to state one of the following Canadian Goods Being Returned for Repair Canadian Goods Being Returned for Warranty Repair Canadian Goods Being Returned One copy of the above documents is to be placed inside the shipping box and one copy is to be placed on the outside of the shipping box marked for CUSTOMS Other products ie Disk drives LCD panels etc which are not purchased from megatel but will be used as part of the servicing of the returned board must be shipped separately and listed in the megatel SERVICE FORM under the Equipment Sent Separately heading Products not purchased from megatel should be shipped under a temporary import license of the maximum time limit Send PREPAID to the SERVICE DEPT at megatel computer corporation 125 WENDELL AVENUE WESTON ONTARIO MON 3K9 CANADA Our Harmonized Number 8471 92 00 Call us at 416 245 2953 between the hours of 9am to Spm EST or send a Fax to us at 416 245 6505 1999 megatel computer corporation PC II amp PC II i Technical Manual MA990734 1 00e Page 57 Photocopy and fill in Photocopy and fill in Photocopy and fill in Photocopy and fill megatel SERVICE FORM RMA Call megatel PRIOR TO SHIPPING to receive your CC RMA Only boards sent with an RMA will be given Date Called priority This RMA must appear on all paperwork and be marked on the o
37. e low Message This signal is driven by the Target during the Message phase This signal is received by the Initiator This signal is active low ISEL IREQ S Select This signal is used by an Initiator to select a Target or used by a Target to reselect an Initiator This signal is active low S Control Data This signal is driven by the Target and indicates whether Control information or Data information is on the Data Bus This signal is received by the Initiator This signal is active low S Reguest When driven by a Target this line indicates a reguest for a REQ AKN data transfer handshake This signal is received by the Initiator This signal is active low Input Output Driven by the Target this signal controls the direction of data movement on the SCSI Bus This signal is also used to distinguish between Selection and Reselection phases This signal is active low 2 C1 C32 Ground 0V 1 0 Terminal Power 5V via a diode 1999 megatel computer corporation PC II amp PC II i Technical Manual MA990734 1 00e Page 39 2 50 Serial Communications Ports The PC IT amp PC II i 16C450 Asynchronous Communications Elements ACE are part of the Intel 82360SL which provides two full IBM compatible RS 232 serial ports Coml and Com2 On board the PC II amp PC II i are line drivers and receivers with RS 232C signal levels and a Maxim 7660 Monolithic Voltage Converter which supplies nega
38. ection The keyboard interface is designed to accept a standard XT compatible or auto switching serial keyboard The keyboard port is found at Port 60h and drives IRQ1 Note Pins not listed in the chart below are not connected Symbol Pin 5 pin 6 pin Type Name and Function No DIN Mini Bi directional Serial Data This is the serial data line for the keyboard Bi directional Clock This is the clock line used to synchronize data transmission from the keyboard to the PC II amp PC IT i 1999 megatel computer corporation PC II amp PC II i Technical Manual MA990734 1 00e Page 43 2 64 Com4 The PC H amp PC I i also provides a Com4 which is an always ready RS 232 serial port The BIOS is programmed to handle the Com4 serial port through standard BIOS Calls INT 14h with 8 data bits 1 stop bit and protocol lines always ready The standard IBM baud rates of 2400 4800 and 9600 are supported Any other baud rate mode is defaulted to 19200 Com4 is not compatible if one talks to the port directly Com4 is found at I O Address 0074h Name and Function Com4 Ring Indicator This channel indicates that a ring signal is being received by the Modem or Data set This signal is active low Data Terminal Ready When this signal is active it indicates that the Com port is ready to receive This signal is active low Clear To Send When this signal is active it indicates that the remote device is re
39. ered trademark of Molex Inc V 40H is a trademark of NEC Corporation IBM is a trademark of International Business Machine Corporation amp PC XT is a registered trademark of IBM Apple Macintosh is a registered trademark of Apple Inc Trantor is a registered trademark of Trantor Systems Ltd MA990734 1 00e PC II amp PC II i Technical Manual 1999 megatel computer corporation Page 2 MA990734 1 00e gt WARNING MAKE SURE The CORRECT_VOLTAGE IS APPLIED to the PC II3 and PC II i e The voltages required to operate the PC H amp PC IT i are 5V and GND e Using a 07B II 0TB 104 or QTB 104AT 5V amp GND are connected to the PC II amp PC IT i via the 96 pin Peripheral Connector and or the 64 pin ISA Bus Connector e One power connector found on the OTB II QTB 104 and QTB 104AT is that of a 4 pin male 3 5 floppy disk styled power connector QTB II uses a straight up type connector whereas the QTB 104 and OTB 104AT use the right angle versions Molex Part 53133 for the right angle version with the mating or housing connector Part 5507 e The total current drawn from the 3 5 floppy disk styled power connector can exceed 100mA 3A max e The 07B 104 and the OTB 104AT have an additional 8 pin 2x4 right angle male header power connector for PC 104 power connection compatibility Male Right Angle 4 3 2 1 3 5 Floppy styled Power Connector 2 8 Ma
40. gatel computer 1986 corporation Entire contents copyright megatel computer 1986 corporation Toronto Ontario Canada 1993 Printed in Canada Disclaimer megatel makes no representations or warranties with respect to any circuitry not embodied within a megatel product megatel specifically disclaims any implied warranties of merchantability for any particular purpose of any megatel product This manual is for information purposes only megatel will not be liable for any direct indirect special incidental or consequential damages resulting from any information obtained from this manual Megatel does not recommend the use of its products in life support applications wherein in failure or malfunction of the component may directly threaten life or injury As part of the terms and conditions of sale the user of megatel products in life support applications assumes all risks of such use and indemnifies megatel against all damages megatel assumes no responsibilty for errors which might appear in this document and reserves the right to revise this document without notice Service Information Should a megatel product require service please contact the megatel Service Department between the hours of 9 00am to 5 00pm EST at TEL 416 245 2953 or send us a fax at FAX 416 245 6505 megatel is a registered trademark of megatel computer 1986 corporation Intel is trademarks of Intel Corporation Molex is a regist
41. hnical Manual MA990734 1 00e Page 17 1 72 64 pin 8 bit Bus Pinout J2 Symbol el Name and Function A0 A19 JA31 A12 CPU Address lines These lines provide the memory and I O address for the entire bus D0 D7 A9 A2 cycle These lines are active high Bi directional Data Bus Data is input on these lines during memory I O and interrupt acknowledge read cycles Data is output on these lines during memory and O write cycles These lines are active high Address Enable AEN is used to indicate that DMA transfers are taking place This line is active high When this line is active the DMA controller has control of the address bus the data bus Read command lines memory and I O and the data bus Write command lines memory and I O T O Channel Ready I O Channel Ready is the acknowledgement from the addressed memory or I O device that it will complete the data transfer This line is active high A low input on this line will insert wait states into the processor s bus cycle to lengthen I O or memory cycles so that it may complete its read or write transfer This line should not be held low for no more than 2 5 microseconds T O Channel Check I OCHK provides the CPU with parity error information regarding the memory or devices using the I O channel This signal is active low When this signal is active an interrupt is generated to the CPU Oscillator The OSC is a constant speed 14 31818MHz clock This signal is not
42. ications eeeeeeeeeeeeeeeeeeeeees 7 1 12 Introduction to the PC II 8 1 13 PC I i General Specifications i 8 1 20 General System Notes 44 9 Power Supply iitao padella iaia 9 ROS Ct 9 Bus Drive Current m ice E a lai 9 Bus Termination Option i 9 1 30 Main Memory 44 444 4 10 1 31 BIOS Option ROM User Memory eeeeeeeseeeeeeeeeees 10 1 32 On board EPROM Enable Disable Jumper J5 10 1 40 Interrupts and DMA 44 4 11 1 50 Interval Timer esrscrrrerrcerecsecerecerece scenico rece reonecereceneesconecene 12 1 60 Real Time Clock ssssssisssoisssosssssssnssoessssissovossosssssssossosoniss osrossse 13 1 61 Real Time Clock General Information 13 1 62 Real Time Clock Interrupt LAH 14 1 63 Real Time Clock Memory Map ii 15 1 70 64 pin 8 bit ISA Bus Interface J2 16 1 71 64 pin 8 bit Bus Header Pinout J2 17 1 72 64 pin 8 bit Bus Pinout J2
43. igh level until it is acknowledged level trigger mode This line is active high In the PC IT PC II i and traditional XT AT architecture this channel is used by the Com2 port and some network cards Interrupt Request 4 Com1 IRQ4 is asynchronous input used to request interrupt service An interrupt request is executed by raising IRQ4 low to high and holding it high until it is acknowledged edge triggered mode or holding IRQ4 at a high level until it is acknowledged level triggered mode This line is active high In the PC I1 PC II i and traditional XT AT architecture this channel is used by the Coml port and some network cards continued on next page 1 72 64 pin 8 bit Bus Pinout J2 continued I B23 B22 B21 Interrupt Request 5 Spare IRQS is an asynchronous input used to request interrupt service An interrupt request is executed by raising IRQ5 low to high and holding it high until it is acknowledged edge triggered mode or holding IRQ5 at ahigh level until itis acknowledged level triggered mode This line is active high In the PC H PC IT i and traditional XT AT architecture this channel is used by the fixed disk controller Interrupt Request 6 Floppy Disk IRQ6 is an asynchronous input used to request interrupt service An interrupt request is executed by raising IRQ6 low to high and holding it high until it is acknowledged edge triggered mode or holding IRQ6 at a high level u
44. ion Option AC Bus termination provides termination close to the characteristic impedance of the signal lines without exceeding the DC output current capabilities of the drivers This increases data integrity and system reliability A resistor capacitor network of 40 60 ohms in series with 30 70pF can be connected between each bus signal and ground 1999 megatel computer corporation PC II amp PC II i Technical Manual MA990734 1 00e Page 9 1 30 Main Memory The standard PC II utilizes a total of 2MByte 4MByte 8MByte or 10MBytes of user DRAM In the 4MByte system page interleaving is utilized The PC IT i utilizes 4MBytes or 16MBytes of user DRAM The average effective wait states in H S Fast Page Mode is 0 2 wait states The BIOS automatically checks the memory at Power On to determine the amount of RAM available No straps or jumpers are needed to specify the size of the Main Memory 1 31 BIOS Option ROM User Memory The standard ROM installed on the PC II or PC II i is a 2Mbit 256KByte E28F020 Flash EPROM which contains the BIOS including the VGA BIOS and SCSI Option ROM for the system There is 128kBytes of user Option Module space Bus space located from address C0000h to DFFFFh 1 32 On board EPROM Enable Disable Jumper J5 Since the PC IT or PC II i on board Flash BIOS EPROM is soldered onto the board a 2 pin jumper has been installed to allow an external EPROM which contains our BIOS to be used via the bus T
45. le Right Angle j PC 104 compatible Power Connector The PC II and PC IT i is the FIRST ITEM TURNED ON amp the LAST ITEM TURNED OFF e NEVER turn off the PC II or PC I i when there are other peripherals connected and powered on such as a printer e This is especially important as the bus and the printer ports are NOT buffered The unbuffered bus and printer port was done to reduce the power requirement of the board e Below is an example of a buffering filtering circuit which can be used for a single printer port line 5V RI 02 R2 From Printer Port Line DOG NN Ah gt To Printer Port D1 Ground D1 1N4148 Signal Diode R1 8 R2 272 Resistors D2 5V TransZorb Transient Voltage Suppressor Note For more detailed information on the QTB II QTB 104 and QTB 104AT please see your QTB Manual Note The ISA Bus Clock is normally buffered 1999 megatel computer corporation PC II amp PC II i Technical Manual MA990734 1 00e Page 3 Table Of Contents PC II amp PC II i Technical Manual Page Limited Warranty essz ss ilaele naire 2 Disclamer STER FE 2 Service Information ivan ile Qi nah ne alli 2 tA WARNING Fi sciccontedscassonssvoussconesdssnrcusctonsnssteetavveccssescesenesses 3 1 00 PC II amp PC II i Introductions 7 1 10 Introduction to the PC II i 7 1 11 PC I General Specif
46. llups The eight data bits are written to the latch at I O Port 378h Reading Port 378h returns the actual state of the data outputs The data lines are 3 state TTL outputs Bi directional operation of the Printer Port is achieved by setting Bit 5 of the Control Register Port 37Ah When Bit 5 is set Bit 5 1 the data lines are inputs When Bit 5 is not set Bit 5 0 the data lines are outputs The interrupt from the Parallel Printer Interface may be disabled under software control calling IRO7 to be used on the PC Bus Clearing Bit 4 of Port 37Ah disables the printer interrupt while setting Bit 4 enables the interrupt from the printer port To receive a printer interrupt IRQ7 must be unmasked in the 8259 PC II amp PC II i Technical Manual 1999 megatel computer corporation Page 34 MA990734 1 00e 2 21 96 pin Eurocard Connector Printer Section Symbol DB25 Name and Function SLCT A10 I Select Indicates the printer is selected This signal is active high PE All the end of paper This signal is active high es A13 I Busy Indicates that the printer is busy and Paper End Indicates the printer has sensed cannot accept data This signal is active low AKN I Acknowledge When active the printer has received the character data and is ready to accept another This signal is active low Data Bit 7 to0 Data is output on these lines to the printer These lines are active high Select in Selects the printer This
47. m Battery 3 22pf Capacitors 40 0 1pf Capacitors 13 10uf Capacitors 3 Dual diode series 4 Dual diode common cathode 1 LED 1 Filter 1 96 pin DIN Eurocard Connector 1 64 pin Bus Header 1 10 pin Bus Extension Strip 1 20 pin Ethernet Header 10 27Q Resistors 5 2 56 2Q Resistors 1 2 75Q Resistors 5 2 78Q Resistors 1 2 182Q Resistors 1 1 100Q Resistor 1 7 220Q Resistor 5 7 1KQ Resistor 5 1 10KQ Resistor 5 1 Isolated Transformer 1 Microprocessor SuperSet 1 ISA Peripheral I O SuperSet Subsystem 4 or 8 4Mx4 DRAM if installed 1 2Mbit 256KB Flash ROM 1 8Mbit 1MB Flash ROM if installed 1 8Mbit 1MB Flash ROM if installed 1 Dual Programmable Clock Oscillator 1 LCA 1 Floppy Disk Controller 1 SCSI Controller 2 RS 232 Drivers 3 RS 232 Receivers l Voltage Converter 1 Video Controller 5 256Kx4 DRAM if installed 4 or 8 1Mx4 DRAM if installed 1 2 input OR Gate 1 2 input AND Gate 1 12V Flash Charge Pump Note Two resistors may be used instead of one single resistor PC II amp PC II i Technical Manual Page 50 1999 megatel computer corporation MA990734 1 00e 6 11 PC II Parts Layout IS98 08 3 000000000000000000000000000000001 gt Go OT0A8TA DS Na F28F008 E28F008 200 00000 0000000000 00000000000000000000000000000000 B 00000000000000000000000000000000 PC II Parts Layout for the
48. may change the time and date at this point While in DOS the time and date can also be changed by typing TIME then entering the desired time and typing DATE then entering the desired date The 128 Bytes of battery backed CMOS RAM is also used to store information pertaining to the CMOS RAM SETUP amp LCD Driver file values The CMOS RAM SETUP includes such information as the time and date the amount of useable memory available video mode monitor type floppy disk drive type and whether there are one or two drives connected For more information regarding the CMOS RAM SETUP please read the Options and Defaults in the PC II Series SBC CMOS RAM SETUP section in the PC v amp PC II Series Products User s Manual When using an LCD panel EL or Plasma display a driver file must be loaded into the 65530 Video controller registers The LCD driver file values are stored in the CMOS RAM of the Real Time Clock and loaded into the proper 65530 registers upon boot up For more information regarding LCD driver files please read the 65530 LCD Manual formerly entitled the PC II LCD Manual continued on next page 1999 megatel computer corporation PC II amp PC II i Technical Manual MA990734 1 00e Page 13 The real time clock is addressed at D Address 0070h 0071h and drives IRQ8 The 3 0V Lithium battery is rated for 190mAh to 200mAh typical in an operation temperature range of 20 C to 70 C The storage temperature
49. ntil it is acknowledged level triggered mode This line is active high In the PC II PC II i and traditional XT AT architecture this channel is used by the floppy disk controller Interrupt Request 7 Printer Port IRQ7 is an asynchronous input used to request interrupt service An interrupt request is executed by raising IRQ7 low to high and holding it high until it is acknowledged edge triggered mode or holding IRQ7 at a high level until it is acknowledged level triggered mode This line is active high In the PC II PC II i and traditional XT AT architecture this channel is used by the parallel printer port LPT 1 Bus Clock Clock is the processor clock This clock is a square wave with a frequency of 12 5MHz or 16MHz PC IT i only Note Special orders will allow boards to be shipped with a hardware strapped clock of 1 2 the System Clock TO Read IOR instructs an I O device to place data onto the I O channel This signal is active low continued on next page 1999 megatel computer corporation PC II amp PC II i Technical Manual MA990734 1 00e Page 21 1 72 64 pin 8 bit Bus Pinout J2 continued I O Write IOW instructs an I O device to read data off of the I O channel This signal is active low Memory Read MEMR instructs the memory to place data onto the I O channel The signal is active low Memory Write MEMW instructs the memory to read data off of the I O channel This signal is a
50. o disable the on board Flash BIOS EPROM remove the shorting plug from the 2 pin jumper that is located at the edge of the board that sides the 196 pin 386SL and the 44 pin 82595 Ethernet controller By removing the shorting plug the on board BIOS EPROM is disabled This jumper is used strictly by megatel and must be installed in order for the PC II or PC II i to function properly Do not remove To Use On board BIOS EPROM Leave shorting plug on PC II amp PC II i Technical Manual 1999 megatel computer corporation Page 10 MA990734 1 00e 1 40 Interrupts and DMA The PC II amp PC II i utilizes the Intel 82360SL to provide 8259 compatible interrupt request lines and 8237 compatible DMA channels Within the 82360SL two interrupt controllers are used to provide interrupt request lines and two DMA controllers are used to provide DMA request lines One interrupt line IRQ2 is used to cascade the two interrupt controllers together leaving a total of 14 interrupt request lines One DMA channel DRQ4 is used to cascade the two DMA controllers together leaving a total of 7 DMA channels The interrupt request lines and DMA channels are shown in the tables below On Bus a si GA Controller Yes aa Yes RTC Timer Alam in Reserved Numeric Co Processor Yes ee TO ira ioni Controller 1 Controller 2 On Bus ii _ roba is DMA Channel 4 E Unused DRQ6 tied to DRQ7 DACK7 tie
51. ocard Connector Floppy Disk Section 37 2 40 SCSI Interface ccssssrssssrsessrsersecsnsessrsessessssesersesssssssesenees 38 2 41 96 pin Eurocard Connector SCSI Section 39 2 50 Serial Communications Ports 44 40 2 51 Coml Primary Communications Port 40 2 52 Com2 Secondary Communications Port eee eee 40 2 53 96 pin Eurocard Connector Coml RS 232 Section 41 2 54 96 pin Eurocard Connector Com2 RS 232 Section 42 2 60 Auxiliary VO cesrerrerereezeseeeeze ez ee zeseeneseeneszeneeneseenezeneonezeonene 43 2 61 96 pin Eurocard Connector Speaker Section 43 2 62 96 pin Eurocard Connector Reset Section 43 2 63 96 pin Eurocard Connector Keyboard Section 43 2 64 Cordio a ei inni le illa ia ia 44 2 70 Other I O Pinouts amp Descriptions 4 45 2 71 96 pin Eurocard Connector Reserved Pins 45 2 72 96 pin Eurocard Connector Power Supply Section 45 3 00 ISA High Integration Ethernet Controller 46 3 10 Ethernet 10 pin Header 47 400 Elastica eee 48 Non Volatile On board Solid State Disk
52. put used by peripheral circuits to obtain DMA service In the traditional XT architecture DRQ1 is unused and DRQ3 is used for a fixed disk controller These lines are active high continued on next page 1999 megatel computer corporation PC II amp PC II i Technical Manual MA990734 1 00e Page 19 1 72 64 pin8 bit Bus Pinout J2 continued Symbol Type Name and Function B4 B25 B24 DMA Request Line 2 Floppy DRQ2 is an individual asynchronous channel request input used by the floppy disk controller to obtain DMA service This line is active high DRQ2 IRQ2 IRQ9 PC II amp PC II i Technical Manual 1999 megatel computer corporation Page 20 MA990734 1 00e Interrupt Request 2 EGA VGA IRQ 15 an asynchronous input used to request interrupt service An interrupt request is executed by raising IRQ2 low to high and holding it high until it is acknowledged edge triggered mode or holding IRQ2 at a high level until it is acknowledged level triggered mode This line is active high In the PC IT amp PC II i architecture this line is used by the video controller In the traditional XT AT architecture this channel is used by LPT2 and some network cards I Interrupt Request 3 Com2 IRQ3 is an asynchronous input used to request interrupt service An interrupt request is executed by raising IRQ3 low to high and holding it high until it is acknowledged edge triggered mode or holding IRQ3 at a h
53. s J14 14 and 12 are used to select the drive to be accessed and MTRO and MTRI J14 10 and 16 enable the spindle motor on the drive megatel s BIOS supports all four types of IBM PC drives You can format the drives as 360kB 720kB 1 2MB or 1 44MB drives The proper methods of formatting are outlined in the PC DOS Microsoft DOS and DR DOS manual Normally the DSELO and DSELI outputs are used to select the drive to be accessed and MTRO and MTR enable the spindle motor on the drive The RPM output is used to change the spindle motor speed of high density drives to allow the reading of low density media RPM 1 for 300 RPM in 360kB mode and RPM 0 for 360 RPM in 1 2MB mode NOTES 1 Some disk drives may have to be reconfigured when used with a twisted cable different drive speeds and or whether the drive is used as Drive A or Drive B Reconfiguration is done by moving the jumpers that are physically on the disk drive For proper jumper settings please refer to the manual that came with your drive 2 The default setting for the Floppy option in the CMOS RAM SETUP is for a 3 5 1 44MB Floppy Disk This will allow the reading of 720kB 1 2MB and 360kB disks but will not allow formatting to occur To enable formatting please set the Floppy option in the CMOS RAM SETUP to the drive size you are using For more information regarding the CMOS RAM SETUP please see the Real Time Clock chapter PC II amp PC II i Technical Manual
54. t signals to a 10 pin header 2x5 on 0 100 2 54mm spacing When connected to the megatel QTB 104 or QTB 104AT the TPE port signals are pulled to a LOBASE T Connector RJ 45 and the AUI port signals are pulled to a 16 pin header Power for the AUI port would be provided externally to a 4 pin AUI power connector on the QTB 104 or QTB 104AT Note The QTB 104 and QTB I04AT are transition break out accessory boards For more information on QTB s read the QTB Manual The AUI port can be connected to an Ethernet Transceiver cable drop to provide a fully compliant IEEE 802 3 AUI interface The AUI port can also be connected to a transceiver to provide a fully compliant IEEE 802 3 10BASE2 Cheapernet interface The TPE port provides a fully compliant IEEE 10BASE T interface Depending on which medium is active the AUI or TPE interface is automatically enabled This automatic selection can be overwritten by software configuration The TPE interface also features a polarity fault detection and correction circuit which detects and corrects a polarity error on the receive twisted pair wire the most common wiring fault in twisted pair networks Ethernet can be found at I O Addresses 0300h 030Fh and drives IRQ11 For proper operation of the Ethernet option megatel s integrated network BIOS would have to be used PC II amp PC II i Technical Manual 1999 megatel computer corporation Page 46 MA990734 1 00e 3 10 Ethernet
55. ter Port 2 0280 02AF PC BUS 02B0 02B7 SCSI Controller 02B8 02BF Aliased 02C0 02F7 PC BUS 02F8 02FF Serial Port 2 COM 2 0300 030F Ethernet 0310 035F PC BUS 0360 036F RESERVED 0370 0377 PC BUS 0378 037F Parallel Printer Port 1 0380 03AF PC BUS 03B0 03DF VGA Video Controller Printer Adapter 03E0 03EF PC BUS 03F0 03F7 Floppy Disk Adapter 03F8 03FF Serial Port 1 COM 1 Note A 10 bit significance in port addresses cause port aliasing at regular I O address intervals With the exception of the Video Controller all I O Addresses are defaults set in the RTC and may be disabled by moving to any unused location which will allow the newly freed location to be used on the bus Also see 8 bit Bus Interface chapter 1999 megatel computer corporation PC II amp PC II i Technical Manual MA990734 1 00e Page 49 6 00 Parts Lists amp Parts Layouts 6 10 PC II Parts List B PC II B C C E D D D F J J J J R R R R R R R R R T U U U U U U U U U U U U U U U U U U U BATT 220 104 106 BAV74 BAV99 LED G FL1046 96MR ADIN 2x32 1x10 2x5 270 56R2 750 78RO 182R0 100R0 221 102 104 ST7033 82386SL 82360SL MT4C4M4B1 E28F020 E28F008 F28F008 ICD2051 2064 37C65 5380 14C88 1489 7660 65530 MT4C4256 MT4C4001J 74HC32 7 4AC08 662 1 PC IT PCB 1 3 0V Lithiu
56. tive voltage to the RS 232C drivers 2 51 Comi Primary Communications Port The interrupt from Channel 1 Com1 drives IRQ4 on the interrupt controller Coml can be found at I O Address 03F8h 03FFh 2 52 Com2 Secondary Communications Port The interrupt from Channel 2 Com2 drives IRQ3 on the interrupt controller Com2 can be found at I O Address 02F8h 02FFh The interrupts IRQ3 and IRQ4 can be masked at the interrupt controller Note For other Communication options such as Com4 please refer to the Auxiliary I O chapter PC II amp PC II i Technical Manual 1999 megatel computer corporation Page 40 MA990734 1 00e 2 53 96 pin Eurocard Connector Com1 RS 232 Section 7 IRTS RXD IDSR C13 i al DCD ia ft Name and Function Com1 Ring Indicator When this signal is active it indicates that a ringing signal is being received by the Modem or Data set This signal is active low Data Terminal Ready When this signal is active it indicates that the Com port is ready to receive This signal is active low Clear To Send When this signal is active it indicates that the remote device is ready to transmit This signal is active low Transmit Data Sout Serial Output This signal serially transmits data to the communication link This signal is set to a logic level 1 upon a Master Reset Request To Send When this signal is active it indicates that the Asynchronous Communication Element
57. to transmit data This signal is active low T ni DCD T C1 C32 N Receive Data Sin Serial Input This signal serially receives data from the communications link Data Set Ready This signal is used by the remote device to indicate that it is ready to establish a link and transfer data with the ACE This signal is active low P Com2 Data Carrier Detect RLSD Receiver Line Signal Detect When this signal is active it indicates that the local set has detected a data carrier or signal which meets its signal quality conditions This signal is active low O Ground 0V PC II amp PC II i Technical Manual 1999 megatel computer corporation Page 42 MA990734 1 00e 2 60 Auxiliary I O 2 61 96 pin Eurocard Connector Speaker Section The combination of the Timer 2 Gate control bit and the Speaker Data bit allow complex waveforms to be generated on the speaker output Symbol Name and Function tj A9 Speaker This signal comes from a SPKR driver circuit and is designed to be used with a Piezo Electric Transducer 2 62 96 pin Eurocard Connector Reset Section This line should be driven with an open collector or mechanical switch Symbol Type Name and Function RESET A32 I Reset When this signal is in its active state it results in a hardware reset of the PC II amp the PC II i This line is active low 2 63 96 pin Eurocard Connector Keyboard S
58. utside of the shipping box Company Name Contact Name Company Address Ship To Bill To Telephone Number Extension Facimile Number Extension Fill in the following as completely and as accurately as possible Model Serial Description of Problem Purchase Order Number for this return Equipment Sent Separately include Model amp Serial Courier Used Waybill Number Courier Company Name Please Circle One Company you wish us to use to return this shipment Our usual is FED EX FED EX EMERY UPS AIR PUROLATOR DHL BAISLEY OTHER If possible Special Comments Instructions you have for us Photocopy and fill in Photocopy and fill in Photocopy and fill in Photocopy and fill PC II amp PC II i Technical Manual 1999 megatel computer corporation Page 58 MA990734 1 00e 1999 megatel computer corporation PC II amp PC II i Technical Manual MA990734 1 00e Page 59 megatel computer 1986 corporation 125 Wendell Avenue Weston Ontario Canada M9N 3K9 Tel 416 245 2953 Fax 416 245 6505
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