Tandon TM848 8-Inch Disk Drive User Manual 1983
Contents
1. 13 14 Side Select TM848 2E only 15 16 In Use Indicator Strappable 17 18 Head Load Line Motor Control 19 20 Index 21 22 Ready 23 24 Motor On Control 4 25 26 Drive Select 1 Side Select Option TM848 2E only 27 28 Drive Select 2 Side Select Option TM848 2E only 29 30 Drive Select 3 Side Select Option TM848 2E only 31 32 Drive Select 4 Side Select Option TM848 2E only 33 34 Direction Select Side Select Option TM848 2E only 35 36 Step 37 38 Write Data 39 40 Write Gate 41 42 Track 0 Write Protect Read Data Alternate I O Alternate I O Write commands When the signal logic level DIRECTION SELECT AND STEP LINES is false high the input control lines and the TWO LINES output status lines are disabled When the drive is selected a true low pulse The Drive Select address is determined by a on the Step line with a time duration greater select shunt on the circuit board Drive Select than one microsecond initiates the access lines 1 through 4 provide a means of daisy motion The direction of motion is determined chaining a maximum of four drives to a con by the logic state of the Direction Select line troller Only one can be true low at a time when a step pulse is issued The motion is An undefined operation might result if two or toward the center of the disk if the Direction more drives are assigned the same address or Select line is in the true low state The direc if two or more Drive Selec2. FIGURE 3 3 LSI CIRCUIT BOARD ASSEMBLY 3 11 FIGURE 3 4 NON LSI CIRCUIT BOARD ASSEMBLY 3 12 READY AND TRUE READY R AND TR When the R jumper is installed the Ready signal is available at the interface When the TR jumper is installed the True Ready signal is available at the interface The R jumper is standard while the TR jumper is optional These two lines are inde pendent functions and may be used separately or together R TR READY OR TRUE READY X Ready signal via J1 22 x True Ready signal via J1 8 NOTE When using the True Ready option Motor Control 3 may not be used LEVER LOCK OPTIONS D DL LL NL The lever lock solenoid an optiona feature can be controlled by the In Use interface line J1 16 D DL LL NL LEVERLOCK SOLENOID Latched with Drive Select Latched by In Use via J1 16 true low Active energizes solenoid Latched by In Use via J1 16 Active low in conjunction with Drive Select latches the solenoid The solenoid remains latched until In Use is false high on the leading edge of Drive Select 3 13 DISK CHANGE DC This output is used to indicate to the con troller that a disk change has been made The internal signal is gated with Drive Select When the lever is opened the Disk Change line goes low true and remains low until the trailing edge of the next Drive Select DC DISK CHANGE Disk Change signal not available X Disk Change si
3. Np ge s PRODUCT SPECIFICATION AND USER S MANUAL NOTICE This document and the information contained herein is copyright by Tandon Corporation and may not be duplicated or reproduced in whole or in part without the prior written approval of Tandon Corporation This document is intended to provide the user with detailed information adequate for the efficient installation operation and service of the equipment involved However while every effort has been made to keep the information contained herein current and accurate as of the date of publication no guarantee is given or implied as to its accuracy TM848 1E TM848 2E THINLINE FLEXIBLE DISK DRIVE 48 TRACKS PER INCH PRODUCT SPECIFICATION AND USER S MANUAL Tandon CORPORATION 20320 PRAIRIE STREET CHATSWORTH CALIFORNIA 91311 COPYRIGHT 1983 TANDON CORPORATION Section Number SECTION 1 1 1 1 2 1 3 1 4 1 5 SECTION 2 SECTION 3 3 1 3 2 3 3 3 4 3 5 CONTENTS Title GENERAL DESCRIPTION Scope Of The Document eee enter o Purpose Of The Drive V 9 9 M M Major Feat res seem ERE A sed wie ae Ce eR ERE see een tae este Microprocessor Control oce pera cece lt lt Write Protect oie inl Ite
4. 3 14 Loading The Diskette 6 kes 3 14 Write Protect Tab uu u la Saw hee Res amu sa NO OK eg n 3 14 Diskette Handling and Storage 3 17 ILLUSTRATIONS FIGURES Figure Page Number Title Number 1 1 Disk Drive eee RR tac exe rs gerere e ae crea aae E 1 4 2 1 Disk Drive Outline Drawing 2 2 2 2 24 Volt D C Current Configuration 1 2 5 2 3 24 Volt D C Current Configuration 2 2 5 3 1 Electrical Interface Characteristics 3 6 3 2 Control and Data Timing Requirements 3 7 3 3 LSI Circuit Board Assembly cece cence 3 11 3 4 Non LSI Circuit Board Assembly 3 12 3 5 Recording Media senile s mg I eee ER eve ed Gas Lee s 3 17 3 6 Diskette Care and Handling hn 3 18 TABLES Table Page Number Title Number 2 1 Electrical and Operational 2 3 2 2 Reliability Specifications 2 6 2 8 Environmental Specifications 2 6 3 1 Drive Interface Lines and Pin Assignments 3 3 3 2
5. ENVIRONMENTAL SPECIFICATIONS The environmental specifications are located in Table 2 3 179049 001 I an c OF CORPORATION CHATSWORTH CALIFORNIA 91311 REV A 2 1 6 32 THD THRU 4 PLCS 2 EACH SIDE 0 149 DIA TOP X 0 156 DIA BOTTOM X 0 430 DEEP 4PLCS 3 50 88 9 MM L 30 5 1 2 25 4 M 4 1 650 19 0 25 4 1 60 gt L r 7 50 0 52 x 12109 d 190 5 MM 13 2 MM 2 025 1 4 58 4 MM IT 21252 NOTES 1 DIMENSIONS ARE GIVEN IN INCHES METRIC EQUIVALENTS ARE IN PARENTHESES 2 TOLERANCE ON ALL DIMENSIONS IS 020 INCH 3 WEIGHT IS APPROXIMATELY 5 7 POUNDS FIGURE 2 1 DISK DRIVE OUTLINE DRAWING 179049 001 I an ci CORPORATION CHATSWORTH CALIFORNIA 91311 REV A 2 2 TABLE 2 1 ELECTRICAL AND OPERATIONAL SPECIFICATIONS Media Media Life for reference only Tracks Per Inch Tracks Per Drive TM848 1E TM848 2E Track Spacing Inside Track Radius Both Drives Side 0 TM848 2E Side 1 Outside Track Radius Both Drives TM848 2E Side 1 Head Life Disk Rotational Speed microproc
6. INDEX The Index signal represents the output of the Index sensor An Index pulse is provided once every revolution 166 67 milliseconds nominal to indicate the beginning of a track to the controller The leading edge of this signal must always be used to ensure timing accuracy The Index line remains in the true low state for the duration of the Index pulse which is nominally four milliseconds TRACK 0 When the drive is selected the Track 0 inter face signal indicates to the controller that the Read Write head is positioned on Track 0 the outermost track This signal remains true low until the Read Write head is moved away from Track 0 This signal is false high when the selected drive s Read Write head is not on Track 0 3 5 WRITE PROTECT The Write Protect signal is provided to indi cate to the user that a write protected diskette is installed This signal is true low when the diskette s Write Protect notch is uncovered When the Write Protect signal is false high the write electronics are enabled and write operations can be performed READ DATA The Read Data line transmits data to the con troller when the drive is selected and not writing It provides a pulse for each flux tran sition recorded and detected on the diskette by the drive electronics Normally this signal is false high It becomes true low for the active state The Read Data output line goes true low for a duration of 200 nanosec
7. installed This output signal is present at the interface 3 A Write Protect sensor disables the write electronics when a write enable tab is removed from the diskette POWER ON SELF TESTS The drive conducts a power on self test as part of the normal power on sequence Two of the tests do not require a diskette to be inserted These tests are the head carriage stepping in away from Track 0 and the head carriage stepping out toward Track 0 Failure of either of these tests is indicated on the front panel L E D by the following flashing sequence 3 flashes then 2 Fails to step in from Track 0 or Track 0 sensor is always equal to zero 3 flashes then 3 Fails to step out to Track 0 or Track 0 sensor is always egual to one A third test monitors the index sensors when ever the diskette lever is closed and must have a diskette inserted into the drive If the diskette lever is closed without a diskette in place or the spindle motor fails to operate an error message flashes on the front panel L E D in the following sequence 3 flashes then 4 No index pulse with lever closed 1 3 Opening and closing the diskette lever is required to repeat a test that has failed The diskette lever must be left open to complete an error cycle 1 5 PHYSICAL DESCRIPTION A representative drive is shown in Figure 1 1 The drive can be mounted in a vertical or hori zontal plane However the logic circuit board must be on the u
8. resulting in accurate centering and clamping of the diskette to the drive hub The drive hub is driven at a con stant speed of 360 RPM by a crystal controlled direct drive brushless D C motor The head is loaded into contact with the recording medium whenever the diskette lever is latched The heads are positioned over the desired track by means of a stepper motor band assembly and its associated electronics This positioner uses a 3 6 degree rotation to cause a one track linear movement When a write protected diskette is inserted into the drive the Write Protect sensor dis ables the write electronics of the drive and a Write Protect status output signal is available to the interface When performing a write operation a 0 013 inch wide nominal data track is recorded Then this track is tunnel erased to 0 012 inch nominal Data recovery electronics include a low level read amplifier filter differentiator zero crossover detector and digitizing circuits No data clock separation is provided In addition the drive is supplied with the fol lowing sensor systems 1 A Track 0 sensor detects when the Head Carriage Assembly is positioned over Track 0 2 The TM848 2E has two index sensors each consisting of an infrared L E D light source and a phototransistor posi tioned to generate a signal when an index hole on the diskette is detected The drive can determine if a single sided or double sided diskette is
9. tronics must be conditioned for writing by the Write Enable line For each high to low transition on the Compos ite Write Data line a flux change is produced at the write head gap This causes a flux change to be recorded on the media When a double frequency type encoding tech nique is used in which data and clock form the combined Write Data signal it is recom mended that the repetition of the high to low transitions while writing all zeros be equal to the nominal data rate 50 1 percent and the repetition of the high to low transitions while writing all ones be equal to twice the nominal data rate 0 1 percent Host controllers may implement write precom pensation circuits that recognize worst case 3 4 patterns and adjust the Write Data wave form Although a value cannot be specified for write precompensation Tandon suggests a value of 125 nanoseconds for systems using MFM double density recording format WRITE GATE When this signal is true low the write electronics are prepared for writing data and the read electronics are disabled This signal turns on Write Current in the selected Read Write head Data is written under the control of the Composite Write Data and Side Select input lines When the Write Gate line is false high all write electronics are disabled When a write protected diskette is installed in a drive the write electronics are disabled irre spective of the state of the Write Gate
10. BENDING AND FOLD NETIC FIELDS 10 to 52 C ING MAY DAMAGE 50 F to 125 F DISKETTE FIGURE 3 6 DISKETTE CARE AND HANDLING 3 18 landon CORPORATE OFFICES 20320 PRAIRIE STREET CHATSWORTH CA 91311 TELEPHONE NO 213 993 6644 TELEX NO 194794 TWX NO 910 494 1721 P N 179049 001 T5007A 5 83 PRINTED IN U S A
11. Cover Saw und dne oy ELS oti Shand pt ei MG ate Cooling z ZAD E saat oe BARA EAA Interface Connections cece ehh her Input Contre Output Control Lines 4444000000000 s Typical Interface Characteristics Drive Address and Option Strapping Drive Select DS1 DS4 Head Select Options 81 58 and 1B 4B Stepper Motor Power PS 65 DS HL Spindle Motor Control Options M1 M3 M4 MOL MOH MC1 MC4 Ready and True Ready R and TR Lever Lock Options D DL LL NL Disk Change DO sos rettet o tue Sedes aa ER n Two Sided Diskette Installed 28 Write Protect WP and NP Page Number m RH L Li 4 Prd wa tite simp LI Qo f ka Vi ie Section Page Number Title Number 3 7
12. free flow of air normal convection cooling allows opera tion within the specified temperature range When the drive is mounted in a confined environment air flow must be provided to maintain specified air temperatures in the vicinity of the motors printed circuit boards and diskettes When forced air is used air flow must be directed outward from the drive Do not intake air through the drive or heads and diskettes 3 4 INTERFACE CONNECTIONS Interface connections for the TM848 1E and TM848 2E are made via a user supplied fifty pin flat ribbon connector 3M Scotchflex Part Number 3415 or its eguivalent This connec tor mates directly with the circuit board connector at the rear of the drive The interface description of the connectors and the location of each one is contained in this section Interface lines are located in Table 3 1 D C power connector pin assign ments are located in Table 3 2 Section 3 5 of this manual The signal wire harness should be of the flat ribbon or twisted pair type have a maximum length of ten feet and have a 26 to 28 gauge conductor compatible with the connector to be used It is recommended that the interface cable have a characteristic impedance of 100 ohms 3 2 All interface signals are TTL compatible Logic true low is 0 4 volt maximum Logic false high is 2 4 volts minimum INPUT CONTROL LINES These input lines are individually terminated through a 150 ohm r
13. ite a i eS Daisy Chain Capability t een internal Trim Erase RA Ace Qk kusqa obe Industry Standard Interface Compatibility Activity Indicator soneron eter Weds ees ER RENE EY HRK D RR Direct Drive Brushless D C Motor Compact Sis teu eek EYES MeV a eei e ea e deeds Diskette Lever Lock Solenoid Functional Description 0 ccc ccc cece cece ehh e hen Power On Self Tests r usuyasa Vene Rd Keke See V e e ee are Physical Description esed ainda aiden ss aos boheme ees HR PRODUCT SPECIFICATIONS Introduction e has Rp Ov Winding Ved ANE UR aker Yai DR NC ed WE Mechanical Specifications 4444 lt 4 enn Electrical and Operational Specifications Reliability Specifications Environmental Specifications OPERATION Introduction d S EU Qe es Unpacking The Drive oe site nn Sate dive tee e jh Preinstallation Checkout Mounting The Drive 4 V Dust
14. 0 RPM OR THE OPTIONAL TRUE READY LINE MUST BE MONITORED FIGURE 3 2 CONTROL AND DATA TIMING REQUIREMENTS 3 7 supplied is AMP Part Number 1 480270 0 using AMP contact Part Number 606191 1 Pin assignments are found in Table 3 2 The chassis should be connected to earth ground to ensure proper operation TABLE 3 2 POWER CONNECTOR PIN ASSIGNMENTS 24 volts D C 24 volts Return 5 volts Return 5 volts Return DRIVE ADDRESS AND OPTION STRAPPING 3 6 The drive address and option strapping is determined by the different jumper configura tions required for specific system applica tions If jumper configurations are changed power should be cycled off and on so the micro processor can recognize the new configuration The description of user selectable options should be used in conjunction with Table 3 3 Throughout Section 3 6 an X denotes jumper installation and a dash denotes jumper removed DRIVE SELECT DS1 DS4 This option allows the user to daisy chain up to four drives and to enable one drive at a 3 8 time Drive Select is implemented by shorting one of the four connections using a shorting plug The drive comes equipped from the fac tory with DS1 installed All outputs are gated with drive select as set up at the factory DS1 DS2 DS3 DS4 DRIVE SELECT x Selects Drive 0 via J1 26 X Selects Drive 1 via J1 28 Selects Drive 2 via J1 30 Sele
15. AD SELECT Head Select via J1 14 Head Select via J1 26 Head Select via J1 28 Head Select via J1 30 Head Select via J1 32 Head Select via J1 34 turn off delay of the spindle motor is activated on the trailing edge of the Motor Control signal With Motor Control using Drive Select or Head Load the M3 and M4 jumpers determine which method of Motor Control is enabled If option M3 or M4 jumpers are installed the Motor On Control MC1 MCA options operate in a logical OR manner with the control signal s selected by the M3 and M4 jumpers NOTE If the Motor Delay Timer option M1 is installed the five second turn off delay is in effect regardless of which M3 M4 con figuration is implemented M1 M3 M4 x MOTOR CONTROL Enables five second motor off delay timer Motor Control only with MC1 M4 options Motor Control using Drive Select Motor Control using Head Load Motor Control using Drive Select and Head Load logical AND MOL MOH MC1 MC2 MC3 MC4 MOTOR CONTROL x E B Motor Control signals are low true active X Motor Control signals are high true active x Motor Control selected via J1 4 2 Motor Control selected via J1 6 Motor Control selected via J1 8 X Motor Control selected via J1 24 p P p x 48000054 3BOOODS3 28 000052 18 000 081 OOR 0053 0052 0051 000C U6 07 0025
16. D C Power Connector Pin Assignments 3 8 3 3 Option Patching RN ER CH ELE TAa i e EX IER RA HAC RS RR E US 3 9 3 4 Diagnostic Mode Of Operation 325 estes 3 15 ii SECTION 1 GENERAL DESCRIPTION INTRODUCTION This document provides required information in order to evaluate or incorporate Tandon s disk drive into a system Tandon Corporation s Model Numbers TM848 1E and TM848 2E eight inch flexible drives are full feature microprocessor controlled drives They may be installed in one half the space normally required for an eight inch drive They are compact data stor age devices that use an IBM formatted indus try standard eight inch diskette Both drives are 48 tracks per inch recording devices The Model 848 series of drives are capable of reading and writing in single density format on a diskette using a proprietary read write head patented by Tandon In addition both drives have a double density capability when Modified Frequency Modula tion MFM or other appropriate recording techniques are used The encoding and decod ing of the data is done by the user s controller The Model TM848 1E drive uses one side of the diskette for data storage The Model TM848 2E drive doubles data storage capabili ties by using both sides of the diskette 11 SCOPE OF THE DOCUMENT This document contains a description of the major features physi
17. R TR DL D LL NL DC 25 WP NP XC IC DM 3 9 As Shipped Installed 52 M1 M3 gt Not Installed DS2 DS4 51 53 X X M4 P P4 HEAD SELECT USING DIRECTION SELECT During a Read or Write operation the state of the Direction Select line is undefined Hence it may be used to select the desired head A high enables Head 0 A low enables Head 1 To incorporate this option etch cut S2 and install 1 51 52 53 18 x 8 zm 252 p b4 b4 bd STEPPER MOTOR POWER PS PS DS HL When the PS jumper is installed stepper motor power is controlled by the Drive Select line DS or the Head Load line HL When either line is true low the stepper motor is driven with full power and is ready for a Seek Read or Write operation When either line is false high 5 volt stand by current is sup plied to the stepper motor to hold the head car riage assembly in position When the PS option is in the stepper motor continuously receives full power PS is diametrically oppo site PS see Figures 3 3 and 3 4 PS PS DS HL STEPPER POWER X Stepper Power continuously on X X Stepper Power on with Drive Select X Stepper Power on with Head Load line J1 18 SPINDLE MOTOR CONTROL OPTIONS M1 M4 MOL MOH MC1 MC4 M1 is used to enable the motor off delay timer When this jumper is installed a five second 3 10 HE
18. cal and functional speci fications mounting and power requirements the interface and typical timing characteris tics of the TM848 1E and TM848 2E drives 1 2 PURPOSE OF THE DRIVE The TM848 1E and TM848 2E drives are rotating disk memories designed for random access data entry storage and retrieval applications Typical applications include 1 1 intelligent terminal controllers micro computers word processing systems data com munication systems error logging program loading and point of sale terminals 1 3 MAJOR FEATURES MICROPROCESSOR CONTROL The TM848 1E and TM848 2E drives feature an onboard microprocessor This microproces sor provides six major features 1 Buffered seek capabilities 2 Improved head positioning accuracy with reduced hysteresis 3 Write current switching for optimal data recording quality 4 True Ready signal 5 Internal diagnostics strappable 6 Power On Self Tests WRITE PROTECT When a write protected diskette is inserted into the drive the write electronics are disabled DAISY CHAIN CAPABILITY The drive provides the address selection and gating functions necessary to daisy chain a maximum of four units at the user s option The last drive on the daisy chain terminates the interface The terminations are accom plished by a resistor array plugged into a DIP socket INTERNAL TRIM ERASE The drive provides the control signals neces sary for proper trim e
19. cts Drive 3 via J1 32 HEAD SELECT OPTIONS S1 S3 and 1B 4B The Side Select options allow the user to select the heads by various means They are imple mented by removing the shorting plug from the DS1 DS4 option pads HEAD SELECT USING DRIVE SELECT To use the Drive Select lines to select the heads etch cut S2 and install S3 along with one of the 1B 4B jumpers The 1B 4B con trol signal selected may not be the same con trol line used for Drive Select or an undefined condition results When the control line that corresponds to the Drive Select jumper is driven low true the drive is enabled and the lower head Head 0 is selected When the con trol line that corresponds to the 1B 4B jumper is driven low true the drive is enabled and the upper head Head 1 is selected Drive Select Head Select Head Select Using Drive Select Power Save Stepper Power From Head Load Line Spindle Motor Control Motor Control Signal Low True Motor Control Signal High True Motor Control Select Ready True Ready Lever Lock Solenoid In Use Lever Lock Option In Use Latched In Use Not Latched Disk Change Two Sided Diskette Installed Inhibit Write When Write Protected Allow Write When Write Protected External Write Current Switch Internal Write Current Switch Diagnostic Mode TABLE 3 3 OPTION PATCHING Trace Designator DS1 DS4 51 53 1B 4B PS HL M1 M3 M4 MOL MOH MC1 MC4
20. e seek between Track 0 and Track 4 with spindle motor on This test is used in conjunction with a scope to dynamically test the Track 0 sensor X X 12 C Monitor the status of the lever position switch This test is used to check the lever position switch The front panel L E D flashes on and off with the opening and closing of the diskette lever position switch X X X 13 D Alternate seek between Track 74 and Track 76 with spin dle motor on By writing data on Track 75 this test determines if the head movement over that track causes any erasure time of 30 milliseconds is allowed for the head to settle at the end of each seek X X X 14 E Turn spindle motor off This test turns off the spindle motor x x x x 15 F Flash version number This test outputs the firmware version number to the front panel L E D Notes X Jumper In Open 3 16 OXIDE COATED MYLAR DISK 8 0 INCH SEALED PROTECTIVE JACKET INDEX HOLE SPINDLE ACCESS HOLE HEAD APERTURE WRITE PROTECT NOTCH FIGURE 3 5 RECORDING MEDIA When the slot is covered with an optically opaque self adhesive tab the diskette is write enabled When the tab is removed the diskette is write protected DISKETTE HANDLING AND STORAGE It is important the diskette be handled and stored correctly so the integrity of the recorded data is maintained A damaged or contami nated diskette can impair or prevent recovery of data and can res
21. ek to Track 76 and turn on spindle motor This test seeks the carriage to Track 76 and turns on the spindie motor This test may be used to check index to data burst and azimuth X X 5 Seek to Track 75 and turn on spindle motor This test seeks the carriage to Track 75 and turns on the spindle motor E X X 6 Toggle front panel L E D with each revolution of the disk This test toggles the front panel L E D at the leading edge of each side zero index pulse A single sided disk should be used for this test X X x 7 Toggle front panel L E D with each revolution of the disk This test toggles the front panel L E D at the leading edge of each side one index pulse A double sided disk should be used for this test x m 8 Alternate seek between Track 0 and Track 76 with spindle motor on This test continuously moves the carriage between Tracks 0 and 76 This test is used to exercise the positioner system X X 9 Seek to Track 2 and monitor the Track 0 sensor This test moves the carriage to Track 2 and displays the state of the Track 0 sensor The Track 0 sensor should change state at Track 2 TABLE 3 4 CONTINUED DIAGNOSTIC MODE OF OPERATION TT Monitor the write protect sensor This test checks the write protect sensor The front panel L E D should turn on and off by moving a disk which has the write protect notch covered in and out of the drive The L E D is on when write protect is true Alternat
22. eres 400 milliamperes 130 milliamperes 20 watts typical When prepared for shipment by Tandon the drive meets the requirements of NSTA preshipment test procedure Project 1A 179049 001 an CORPORATION CHATSWORTH CALIFORNIA REV A Configured for stepper motor enabled during motor start 2 25 amps typical surge 100 150 TIME IN MILLISECONDS gt FIGURE 2 2 24 VOLT D C CURRENT CONFIGURATION 1 Configured for stepper motor disabled until motor comes up to speed 1 8 amps typical surge STEPPER MOTOR ENABLED 2 0 50 100 150 TIME IN MILLISECONDS FIGURE 2 3 24 VOLT D C CURRENT CONFIGURATION 2 landon CORPORATION CHATSWORTH CALIFORNIA 91311 2 5 179049 001 REV TABLE 2 2 RELIABILITY SPECIFICATIONS Error Rates maximum exclusive of external sources e g electronics defective and contaminated diskettes Soft Errors Recoverable One in 10 bits Hard Errors Nonrecoverable One in 10 bits Seek Errors One in 10 seeks Mean Time Between Failures 10 000 power on hours Mean Time To Repair 30 minutes TABLE 2 3 ENVIRONMENTAL SPECIFICATIONS Temperature Operating media dependent 4 4 C to 46 40 to 115 Nonoperating 40 C to 71 C 40 F to 160 F Relative Humidity Operating noncondensing media dependent 20 to 80 percent Nonoperating noncondens
23. esistor pack installed in the dip socket located at integrated circuit location RP5 or RP1 in the Large Scale Inte gration version In a single drive system this resistor pack should be installed to provide the proper terminations In a multiple drive system only the last drive on the interface is to be terminated All other drives on the inter face must have the resistor pack removed The drive can terminate the following input lines Direction Step Write Data Write Gate In Use Side Select TM848 2E only Write Current Switch Head Load 9 399 PR WN rr MOTOR ON CONTROL The Motor On Control lines are used to control the spindle motor With the MOL jumper in factory installed the Motor On Control lines are low true With the MOH jumper installed optionaD the Motor On Control lines are high true see Table 3 3 located in Section 3 6 DRIVE SELECT LINES The Drive Select lines provide a means of selecting and deselecting a drive These four lines DS1 through DS4 allow independent selection of up to four drives attached to the controller When the signal logic level is true low the drive electronics are activated and the drive is conditioned to respond to Step or to Read TABLE 3 1 DRIVE INTERFACE LINES AND PIN ASSIGNMENTS Write Current Switch Motor On Control 1 Motor On Control 2 True Ready Motor On Control 3 Optional Two Sided Strappable TM848 2E only Disk Change Strappable
24. essor controlled Instantaneous Speed Variation ISV Motor Start Time Seek Time Track to Track Head Settling Time Average Track Access Time including head settling time Data Transfer Rate GIN CICI CORPORATION CHATSWORTH CALIFORNIA 91311 REV A 2 3 203 20 millimeter 8 inch IBM industry standard diskette 3x 10 passes per track 48 TPI both drives 77 tracks per drive 154 tracks per drive 77 per side 0 529 millimeter 20 8 milinches 51 50 millimeters 2 03 inches 49 42 millimeters 1 95 inches 91 75 millimeters 3 61 inches 89 64 millimeters 3 53 inches 15 000 media contact hours 360 RPM 1 5 percent 1 percent 150 milliseconds maximum 3 milliseconds minimum 15 milliseconds 91 milliseconds 500 000 bits per second TABLE 2 1 CONTINUED ELECTRICAL AND OPERATIONAL SPECIFICATIONS Flux Reversals Per Inch FRPD inside track Both Drives Side 0 TM848 2E Side 1 Unformatted Recording Capacity TM848 1E TM848 2E D C Voltage and Current Requirements 24 volts D C Power 5 volts D C Power Typical Current Requirements For 24 volts D C Spindle Motor Stepper Motor Electronics Power Dissipation Shipment 6 536 FRPI 6 816 FRPI 0 8 megabyte per disk 1 6 megabytes per disk 24 volts 10 percent at 700 milliamperes typical For surge current requirements see Figures 2 2 and 2 3 5 volts 5 percent at 450 milliamperes typical 170 milliamp
25. gnal available via J1 12 TWO SIDED DISKETTE INSTALLED 2S When a two sided diskette is installed internal circuitry gates this signal with Drive Select It sends a low true signal to the controller indicating that a double sided diskette is installed ndex hole two is present This option is factory installed 28 TWO SIDED DISKETTE Two sided diskette signal not available X Two sided diskette signal available via J1 10 WRITE PROTECT WP AND NP This WP option is used to lock out the Write Gate when a write protected diskette is installed It is factory installed The NP option allows the controller to write on any diskette whether or not it is write protected It does not stop the Write Protect signal from being sent on the interface line This option is implemented by removing WP and installing NP WP NP WRITE PROTECT X Disables Write Protect for write protected diskette x Allows writing on any diskette WRITE CURRENT SWITCH XC AND IC The XC option allows the host controller to switch the Write Current independently of the drive s onboard microprocessor It is factory installed To implement the IC option remove the XC jumper then install a jumper at IC XC IC WRITE CURRENT SWITCHING X External Write Current switch X Microprocessor automat ically switches Write Cur rent at Track 43 DIAGNOSTIC MODE OF OPERATION DM DL M1 M3 M4 The test programs allow the u
26. ing 5 to 95 percent 179049 001 landon CORPORATION CHATSWORTH CALIFORNIA 91311 REV A 2 6 SECTION 3 OPERATION INTRODUCTION This section contains information on how to unpack check out install and operate the TM848 1E and TM848 2E drives 3 1 UNPACKING THE DRIVE The drives are packaged in protective con tainers to minimize the possibility of damage during shipment The following list is the recommended procedure for unpacking the drive 1 Place the container on a flat work surface 2 Remove the upper half of the container 3 Remove the drive from the lower half of the container 4 Check the contents of the container against the packing slip 5 Investigate the contents of the con tainer for possible damage 6 Notify the carrier immediately if any damage is found 3 2 PREINSTALLATION CHECKOUT Before applying power to the drive the follow ing inspection should be conducted 1 Check to ensure that the diskette lever opens and closes 2 When the lever is moved to an open position the head arm raises 3 Remove the cardboard shipping insert and retain for future shipment 4 Ensure that the front panel is secure 5 Ensure that the circuit board is secure 6 Ensure that the connectors are firmly seated 3 3 MOUNTING THE DRIVE The drive has been designed so it may be mounted in any plane i e upright horizontal or vertical When mounted horizontally the Logic c
27. ircuit board side of the chassis must be the top side Eight holes are provided for mounting two on each side and four on the bottom of the hous ing see Figure 2 1 The two mounting holes on each side are tapped for 8 32 screws The four mounting holes on the bottom require 8 32 thread forming screws When installed in either plane horizontal or vertical only two mounting screws are required to securely hold the drive in place Optional straps are available to permit two drives to be attached together for installation in standard width drive openings Any mounting scheme in which the drive is part of the structural integrity of the enclo sure is not permitted Mounting schemes should allow for adjustable brackets or incor porate resilient members to accommodate tolerances In addition it is recommended that mounting schemes include no more than two mounting surfaces The drive is manufactured and tested with some critical internal alignments that must be maintained Hence it is important that the mounting hardware not introduce significant stress on the chassis DUST COVER The design of an enclosure should incorporate a means to prevent contamination from loose items e g dust lint and paper chad since the drive does not have a dust cover COOLING Heat dissipation from a single drive is nor mally 20 watts 68 BTU per hour under high load conditions When the drive is mounted so the components have access to a
28. ollowing characteristics True 0 4 volt maximum at I a 48 milliamperes maximum V False 2 4 volts minimum open collector at I 250 microamperes maximum Figure 3 1 contains the electrical interface characteristics Figure 3 2 contains the control and data timing requirements 3 5 D C POWER D C power is supplied to the drive through a six pin AMP connector J2 mounted on the circuit board The mating connector not 5V 150 OHMS 741814 EQUIVALENT TRUE RECEIVER FIGURE 3 1 ELECTRICAL INTERFACE CHARACTERISTICS D C POWER VALID CONTROL OUTPUT SIGNALS DRIVE SELECT SIDE SELECT TM848 2E ONLY DIRECTION SELECT STEP TRUE READY WRITE GATE WRITE DATA VALID READ DATA SIGNAL NOTE 150 MILLI Ko o SES 7 5 MILLISECONDS MINIMUM gt gt 3 _ __ 500 NANOSECONDS MAXIMUM 2 ________ 100 MICROSECONDS MAXIMUM smgnppesonn 1 MICROSECOND MINIMUM 1 MICROSECOND 1 MICROSECOND MINIMUM MINIMUM 13 MILLISECONDS 15 MICROSECONDS MINIMUM 90 MILLISECONDS MINIMUM 18 MILLISECONDS 100 MICROSECONDS i EN NDS SEE NOTE pe 4 Mcrosetonos MAXIMUM 16 MILLISECONDS MINIMUM bul 1 f SONICS ONDE MINIMUM SEE NOTE 90 MILLISECONDS MAXIMUM SECONDS MINIMUM DELAY MUST BE INTRODUCED AFTER DRIVE SELECT TO ALLOW TIME FOR THE D C MOTOR TO REACH 36
29. onds 50 nanoseconds for each change recorded on the diskette READY The Ready interface signal indicates a disk ette has been inserted into the drive Ready will not return to the false state until the lever is opened and is not affected by Spindle Motor Control When a single sided diskette is installed Ready is active low if side zero is selected Ready is false high if side one is selected on the TM848 1E When a two sided diskette is installed Ready is active when either side of the diskette is selected on the TM848 2E TRUE READY The True Ready interface signal indicates the diskette is rotating at 360 RPM and a seek operation is complete ie the head has settled This may be used to indicate seek com plete when using the buffered seek operation NOTE This is a strappable feature with the Motor Control 3 input signal line DISK CHANGE This strappable feature provides a true low signal to the interface when Drive Select is activated if the drive has gone from a Ready to a Not Ready condition while deselected This line is reset on the true to false transition of Drive Select if the drive has gone to a Ready condition TWO SIDED This option is available only on Model TM848 2E True ow indicates that a two sided diskette is installed TRUE 7438 1 EQUIVALENT 1 10 FEET TYPICAL INTERFACE CHARACTERISTICS Lines between the controller and the drive have the f
30. or Side Select lines With the NP jumper installed a diskette cannot be write protected NOTE Changes of state of the Write Gate line should occur before the first Write Data pulse IN USE This strappable feature controls the lever lock solenoid when the DL option is installed WRITE CURRENT SWITCH Normally Write Current switching is accom plished by the host controller A true low level on this line reduces the Write Current Using option IC the drive automatically reduces Write Current at Track 43 SIDE SELECT The Side Select interface line available only on Tandon s TM848 2E defines which side of a two sided diskette is used for reading or writing An open circuit false high level selects the Read Write head on side zero the lower head of the drive A true low level on this line selects the Read Write head on side one the upper head of the drive When switch ing from one head to the other a 100 micro second delay is required before any Read or Write operation can be initiated HEAD LOAD LINE MOTOR CONTROL This line may be used to control the spindle motor and or the lever lock solenoid see Section 3 6 OUTPUT CONTROL LINES There are eight output lines five of which are standard and three of which are strappable features The standard output signals are Index Sector Track 0 Write Protect Read Data and Ready The strappable output sig nals are Disk Change Two Sided and True Ready
31. ppermost side when the drive is mounted horizontally The spindle is rotated by a direct drive brush less D C motor with an integral tachometer The crystal controlled servo circuit and tachometer control the speed of the spindle Operator access for diskette loading is pro vided via a horizontal slot located at the front of the drive The read write double head assembly is posi tioned by a split band positioner mounted to a microprocessor controlled stepper motor The read write heads are glass bonded ferrite ceramic structures with a life expectancy of 15 000 operating hours The control electronics of the drive are mounted on a printed circuit board located above the chassis Power and interface signals are routed through connectors plugging directly into the logic circuit board A second circuit board mounted under the drive oper ates the brushless D C spindle motor Disk DRive 14 SECTION 2 PRODUCT SPECIFICATIONS INTRODUCTION This section contains the mechanical electrical reliability and environmental specifications for the TM848 1E and TM848 2E drives 2 1 MECHANICAL SPECIFICATIONS Figure 2 1 contains the physical dimensions of the drive 2 2 ELECTRICAL AND OPERATIONAL SPECIFICATIONS The electrical and operational specifications are located in Table 2 1 2 3 RELIABILITY SPECIFICATIONS The reliability specifications are located in Table 2 2
32. rasure of data INDUSTRY STANDARD INTERFACE COMPATIBILITY The drive is compatible with controllers that use an industry standard interface ACTIVITY INDICATOR An activity indicator located on the front panel is automatically illuminated when the drive is selected This front panel L E D is also used as an indicator in the diagnostic mode DIRECT DRIVE BRUSHLESS D C MOTOR The spindle motor is a crystal controlled direct drive brushless D C motor for improved motor start time and speed accuracy COMPACT SIZE The reduced size of the drive occupies only one half the mounting space required for a conventional drive DISKETTE LEVER LOCK SOLENOID The diskette lever lock solenoid is controlled by the host system 1 4 FUNCTIONAL DESCRIPTION The drives are fully self contained and require no operator intervention during normal operation Each drive consists of a direct drive spindle system a head positioning system and a read write system The TM848 1E is a single sided drive The TM848 2E is a double sided drive The only difference between the two drives is the number of heads The circuit board is identical for both models When the diskette lever is opened access is provided for the insertion of a diskette The diskette s jacket is accurately positioned by plastic guide rails Its location is ensured by the back stop and disk ejector Closing the diskette lever activates the cone clamp system
33. ser to test some aspects of drive operation without the use of Special test equipment The programs allow the user to isolate the problems of the drive The diagnostic mode provides 16 tests see Table 3 4 To enter the diagnostic mode 1 Make a note of which jumpers are installed for normal operating condi tions see Table 3 3 2 Remove the DL M1 M3 and M4 jumpers 3 Install the DM jumper and supply power to the drive 4 Using the DL M1 M3 and M4 jumpers select the diagnostic test desired by inserting the jumper accord ing to Table 3 4 To exit the diagnostic mode l Remove power from the drive 2 Remove the DM DL M1 M3 and M4 jumpers 3 14 3 Reinstall the jumpers in their original configuration 4 Poweron the drive 3 7 DISKETTES The TM848 1E and TM848 2E drives use an IBM compatible eight inch diskette Disk ettes are available with a single index hole or with multiple index and sector holes Diskettes with a single hole are used when soft sector format is required Multiple hole diskettes provide sector information through the use of an index sensor and electronics Figure 3 5 illustrates the diskette used with the drive This recording media is a flexible diskette enclosed in a protective jacket The diskette free to rotate within the jacket is continuously cleaned by its soft fabric lining during normal operation LOADING THE DISKETTE The drive is loaded by inserting
34. t lines are in the tion of motion is away from the center of the true low state simultaneously A Drive disk if the Direction Select line is in the false Select line must remain stable in the true high state low state until any operation in progress Step Read Write is completed To ensure proper positioning the Direction Select line should be stable at least 1 micro Using Side Select options 1B through 4B second prior to the corresponding rising edge Drive Select lines may be used as Side Select of the step pulse and remain stable 100 nano lines for the TM848 2E see Section 3 6 seconds after it 3 3 NOTE TM848 1E and TM848 2E drives include a microprocessor controlled buffered seek capa bility The controller may issue step pulses of one microsecond minimum width and fifteen microseconds minimum spacing between trailing edges Internal drive electronics issue step com mands at a rate of three milliseconds The drive electronics ignore step pulses when one of five conditions exists 1 The Write Gate is true low 2 The Direction Select is false high and the head is positioned at Track 0 3 The drive is not selected 4 When trying to seek beyond Track 76 5 When the diskette lever is opened COMPOSITE WRITE DATA When the drive is selected this interface line provides the bit serial Composite Write Data pulses that control the switching of the Write Current in the selected head The write elec
35. the diskette with its head aperture forward into the front slot of the drive Access to the diskette loading slot is obtained by opening the front lever The diskette should be carefully inserted until it is solidly against the back stop CAUTION Damage to the center of the disk ette may result if the door is closed when the diskette is not properly inserted This prevents reliable recovery of the recorded data WRITE PROTECT TAB The drive is equipped with a Write Protect Sensor Assembly This sensor operates in con junction with the diskette which has a slot cut in the protective jacket TABLE 3 4 DIAGNOSTIC MODE OF OPERATION ra oe oe om om oi Seek to Track 0 and turn on spindle motor This test seeks the carriage to Track 0 and turns on the spindle motor It may be used to check the Track 0 status Seek to Track 1 and turn on spindle motor This test seeks the carriage to Track 1 and turns on the spindle motor It may be used for index to data burst testing with an alignment diskette x X 2 Seek to Track 38 from Track 0 and turn on spindle motor This test seeks the carriage to Track 0 then to Track 38 It may be used for radial alignment adjust ment with an alignment diskette X X 3 Seek to Track 38 from Track 76 and turn on spindle motor This test seeks the carriage to Track 76 then to Track 38 This test along with the previous one is used to measure hysteresis X 4 Se
36. ult in damage to the Read Write heads Figure 3 5 contains an illustration of the physical configuration of the diskette The 7 88 inch diskette is oxide coated flexible mylar It is enclosed in an eight inch square protective jacket In addition openings for the drive hub and diskette index hole are provided Figure 3 6 provides some helpful hints on the care and handling of the drive and diskettes In addition to ensure trouble free operation and to enhance the service life of the diskette the following handling procedure should be observed 1 Return the diskette to the protective jacket when not in use 2 Avoid exposing the diskette to any magnetizing force in excess of 50 oersted NOTE The 50 oersted level magnetiz ing force is reached approxi mately three inches from a typical source e g motors gen erators or transformers 3 To avoid warping the diskette do not store it in direct sunlight 4 Do not use a lead pencil or a ballpoint pen to write on the label Use a felt tipped pen and mark lightly on the label 3 17 X DO NOT WRITE ON THE DO NOT TOUCH PRECI TO AVOID DAMAGE TO RETURN THE DISKETTE JACKET WITH PEN OR SION SURFACE WITH THE DISKETTE AND TO TO ITS JACKET WHEN PENCiL USE A FELT YOUR FINGERS YOUR DRIVE iNSERT NOT IM USE TIPPED PEN DISKETTE CAREFULLY UNTIL THE BACKSTOP IS ENCOUNTERED N NZ KEEP THE DISKETTE DISKETTES SHOULD HANDLE WITH CARE AWAY FROM MAG BE STORED AT
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