ZDS 1/25,1/40
Contents
1. ae i ka Lr d 1 0 _ INTRODUCTION The Development System 3K Monitor is intended to provide the basic debugging commands basic Input Output and bootstrap portions of a floppy disk based operating and development system The system consists of a bootstrap loader a floppy disk driver a terminal handler and a command interpreter The system resides in 3K bytes of PROM memory starting at address 0 and uses 1K bytes of RAM including 256 bytes allocated for the system stack At the time of system RESET the 3K Monitor reads from the terminal to determine the baud rate required at the serial interface The user should input a carriage return at this time Then all variable parameters are set in RAM to their initial values Next the USART is programmed for asynchronous operation with two transmit Stop bits no parity 8 data bits and divide by sixty four operation After this the USART is further programmed to generate active low signals on REQUEST TO SEND and DATA TERMINAL READY and both the receiver and transmitter are enabled Finally the disk interface is set to the bit control mode on both of its ports and appropriate directions are assigned to the bits There is a slight delay while the baud rate is being determined after which the Monitor outputs a prompt gt signifying that it is ready for its first command string from the terminal that command is a si2. 7 1 25140 PROM Users Manual E 1 ATA MMM A 1 4 2 A 2 2 2 _ 2 _ EP ee Price 2 00 03 3002 01 Revision May 1975 Copyright 1978 by Zilog Inc All rights reserved No part of this publication may be reproduced stored in a retrieval system or transmitted in any form or by any means electronic mechanical photocopying recording or otherwise without the prior written permission of Zilog Zilog assumes no responsibility for the use of any circuitry other than circuitry embodied in a Zilog product No other circuit patent licenses are implied a _ TABLE OF CONTENTS FLOPPY DISK TTY DEBUG 4 1 DEBUG 5 4 2 DEBUG 4 3 MEMORY 4 4 EXECUTING A PROGRAM IN USER MODE 4 5 EXECUTING PROGRAMS IN MONITOR MODE 4 6 DEBUGGING A PROGRAM WHICH IS INTENDED TO RUN IN MONITOR SYSTEM 5 11 12 12 13 14 15 Antium
3. 1 The GO and NEXT Commands do not work If they are executed the system will stop and a bootstrap procedure will be necessary 2 In any PROM DEBUG command that accesses memory DISPLAY SET MOVE FILL the address used is 1000H lower than the address entered in the command 7 This problem may be eliminated by setting the AD Register to zero Example gt R AD AD 1000 0 3 The PORT Command can do I O only to ports through PFFFH e g The B Register of the BC pair in an OUT C A Instruction is always set to OFFH 4 BREAK PULSE and TRACE Commands set with the PROM DEBUG program are lost if the user returns to the ZAP environment E3 3002 01 Rev 19 10 25 78 C READER S COMMENTS Your feedback about this document is important to us only in this way can we ascertain your needs and fulfill them in the future Please take the time to fill Sut this questionnaire and return It to us This information will be helpful to us and In time to the future users of Zilog systems Thank you Your Name Company Name Address Title of this document What software products do you have What is your hardware configuration including memory size __ Does this publication meet your needs No f not why not How do you use this publication Check all that apply As an introduction to the subject As a reference manual As an instructor or student How do
4. VALUE OA VALUE 0A 0C OE 10 VALUE 80 Cl C2 C3 C4 C5 C6 VALUE 2 OF ENABLED 0000 u i 7 DOCUMENT CHANGE NOTICE d A Zilog M DATE 10 25 78 DCN NUMBER E3 3002 01 Rev A PUBLICATION NUMBER 03 3002 01 Rev A TITLE 2DS 1 25 1 40 PROM User Manual PREVIOUS DCN sS BY NUMBER None EFFECTIVE DATE 10 25 78 This Document Change Notice provides an addendum page for the publication specified above This addendum will remain in effect for subsequent releases unless specifically amended by another DCN or superseded by a publication revision The attached page is to be added at the back of the manual ADDENDUM page 19 Changes to text or illustrations are indicated by a vertical line to the left of the change NOTE Please file this DCN at the back of the manual to provide record of changes CF 1017 01A 6 ADDENDUM FOR ZDS 1 40 USERS ONLY The Zilog Analyzer Program ZAP is supplied to 2DS 1 40 users to replace the capability of the PROM DEBUG Program as described in Section 4 of the 2DS 1 25 1 40 PROM User Manual The capability of the ZAP Program see discussion in the 280A CPU Emulator Module Software User s Guide 03 0110 01 Rev A makes it unnecessary for a 205 1 40 user to concern himself with the PROM DEBUG software If the PROM DEBUG software is used on the 205 1 40 the following discrepancies will become obvious
5. 2 BRKFLG is initialized to 0 15 7 ee rr ow ee au BRKRTN Breakpoint Return FC5H FC6H This location is used with BRKFLG to make use of an external breakpoint handler see Section 4 2 BRKRTN is initialized to 0 External Return FB5H FB6H This location is used with BRKFLG when calling the Debug command interpreter see Section 4 2 NMIDSP Non maskable interrupt Dispatch EEEH EEFH The contents of this location specifies the address to branch to on Non Maskable Interrupt NMI WNMIDSP is initialized to 0 RSTPSP RST 38 dispatch EECH FEDH The contents of this location specify the addresses to branch to when a RST 38 is executed RSTDSP is initialized to 0 There are several eauates used by the system They are ZDS SYSTEM HARDWARE I O PORT ADDRESS PORT ADDRESS USART DATA F4 USART CONTROL STATUS F5 BAUD RATE DETECTION FF CTC CHAN F CTC CHAN 1 F1 CTC CHAN 2 F2 CTC CHAN 3 F3 REAL TIME STORAGE MODULE FC BREAKPOTN T FB SYSTEM RESET FD SYSTEM STATUS FE DISK DATA DISK CONTROL F9 DISK STATUS FA 16 3K MONITOR I O ROUTINE CODES FLOPPY REOUEST CODE RDBIN WRTBIN TTY REQUEST CODE RDBIN RDLIN WRTBIN WRTLIN ERROR CODES NORMAL RETURN INVALID OPERATION REQUEST DISK NOT READY DISK WRITE PROTECTED SECTOR ERROR TRACK ERROR CRC ERROR CPU INITIAL STATE INTERRUPT MODE INTERRUPT VECTOR INTERRUPT FLIP FLOP STACK POINTER 17
6. Address lt 1 gt PRIPW Port lt n2 gt 1 Data n3 Mask lt 4 gt The Break command is used to program the Hardware Breakpoint Module with the specified combination of bus transactions that will terminate real time execution of the user s program and return control to the Debug environment Once in tbe Debug environment the user can employ Debug commands to determine if his program is executing correctly to modify the program or CPU status and then return to the real time execution of the user program via a Go command Upon occurrence of a hardware break the entire status of the user s CPU is saved allowing execution to be resumed at a later date with the entire status restored to its former condition 5 U LLL _ The first parameter of the command specifies the type of transaction that will generate the break Either Memory Read MR Memory Write MW Instruction Fetch Cycle Ml Port Read PR or Port Write PW can be specified If no other parameters are entered the system will break on the first occurrence of a transaction of the specified type For example if the command B PW is entered and the user program executed the System would break on the first Port Write to any port The second parameter specifies a memory or port address This parameter is entered only if it is desired to specify a specified memory or port address at which the Break will occur For example the com
7. EH RDLIN CH and WRTLIN 10H The binary operations read or write the Specified length of data between the serial interface and the block of memory beginning at the data transfer address No special characters are honored in binary operations No echoing is performed on RDBIN The RDLIN operation begins with the issuing of a prompt character to the terminal and proceeds to input characters to the data transfer area from the serial interface 11 input characters are echoed Special line delete initialized by the 3K Monitor to I or ASCII 21H and character delete initialized by the 3K Monitor to or ASCII 40H are honored by this routine A RDLIN operation will terminate either on receipt of the number of characters specified as the transfer length or on receipt of a carriage return The carriage return will be echoed and the number of line feeds and null characters specified in system RAM see Section 5 0 will be generated The WRITE operation also proceeds either for the number of characters specified as the transfer length or until a carriage return 1s encountered After a carriage return is encountered the end of line sequence described above insertion of LF and NULs is performed L Both ASCII line operations return a count of the number of characters actually transferred in the transfer length field If one is added to the request code control will be transferred to the completion return address afte
8. OPPY wi1ll return after the operation 15 completed In this case the completion return address is ignored If the data transfer length 1s not divisible bv the sector Size 1 128 bytes it will be increased to the next integral multiple of the sector size Data will be written read from contiguous sectors The length should be such that the entire transfer will take place between the sector where transfer starts and the end of the track If this limitation is not observed 2 sector error will result on a read operation and a permanent sector error will be written on a write operation resulting in certain sectors being permanently inaccessible without reformatting tbe disk If an error occurs and the error return address is non zero the routine at that address will be called rt may take whatever action is appropriate and return the address 18 zero the return would be as though there were no error except for the setting of the condition code Bit 7 of the condition code byte is set when the operation is completed Bit 6 1s set to indicate that an error occurred The bottom six bits indicate which error it was Possible return codes are Normal Return 80H Invalid Operation Request Not Ready Disk is signalling a Mot Ready condition C2H 4 Disk is write protected C3H Sector Error The Sector address in the sector header did not agree with the sector position Track Err
9. above l Move Monitor program into dynamic memory User mode address 0 L gt M 0 000 2 Set desired breakpoints and trace mode gt B Ml A 1C80 gt T MR MW NOTE The RIO system sizes memory via execution of a memory write followed by a memory read Thus to prevent the sizing routine from causing a break Ml should be specified instead of MR p 1 3 Transfer control to the copy of the Monitor program in User memory gt G 0 NOTE This places the system in User mode and is equivalent to a system Reset It is therefore necessary to supply a speed recognition character CR and a bootstrap command CR or OS after which the system will be at the executive level but executing in User mode 4 The file name would then be typed thus beginning execution of the program At this point the breakpoint set in step 2 above would be encountered and the system would return to the Monitor mode BREAK AT xxxx 14 78 J 5 0 SYSTEM PARAMETERS There are several system parameters which are accessible Wo to the user They are NULLCT Null Count FBFH In this location the number of null characters which will be inserted after a carriage return and whatever number of line feeds whicb are also inserted is stored Modifying the null count is the means of adapting the MCS to the carriage return delays of various terminals NULLCT is initialized to Q0 LFCNT bine Feed Coun
10. and User mode for a detailed description of these modes see the 280 Development System Hardware User s Manual When in Monitor mode the Monitor and system RAM is mapped into the bottom of memory address 0 gt FFFH where they are designed to execute In User mode they are mapped into addresses gt FFFFH Thus to execute PROM routines in User mode they must be moved down to the range 0 gt FFFH see Section 4 1 Although the Debug commands execute in Monitor mode they are designed to operate on the user address space thus 1000H is added to the Specified addresses when using the Display Get Load Save and Move commands If the user wishes to deal with the monitor address space this addition can be inhibited This is done by setting location OFD8H and OFD9H ADRFLG to zero FFD8H FFD9H in user space Monitor Space User Space 6 FFFF 64K SYSTEM RAM SYSTEM PROM USER SPACE 1000H SYSTEM RAM COOH SYSTEM PROM Q OH 000H 4 4 EXECUTING A PROGRAM IN USER MODE To execute a program in User mode it should be loaded from the debugger via the LOAD or GET commands Execution 1S Started via the GO command which switches to user mode Breakpoints and traces can be set via the BREAK and TRACE commands before executing the GO command Note that ADRFLG should be set to 1000 12 m 4 5 EXECUTING PROGRAMS IN MONITOR MODE The following section describes how to prepare an
11. as follows Bit O First even stored marker Bit 1 Halt acknowledge Inverted Bit 2 Ml Bit 3 Bus acknowledge Bit 4 MW Bit 5 MR Bit 6 PW Bit 7 PR i Interrupt Status The Interrupt Status command displays the state of the interrupt enable flip flop when the user program was executing 0 for interrupts disabled T l for interrupts enabled user then change the status by entering 0 DI or a l EI or he may terminate the command with a O or carriage return Jump lt address gt The Jump command will branch unconditionally to the given address Registers are restored before branching however unlike the Go command the gt transition to User mode is not made If no address is given Jump will cause a branch to the last stored PC J r Move lt dest gt source n The Move command is used to move the contents of a block of memory from the source address specified by source to the destination address specified by dest n is the length of the block to be moved There are no restrictions on source dest or n except that they be positive integers and that the blocks be bound within the 64K bytes addressed by the 280 CPU 8 Next lt n gt The Next command will cause the execution of the next n machine instructions starting at the current PC and display all registers after each instruction execution If n is not
12. carriage return either alone or after new contents will cause the next register to be displayed If no more registers are desired a O for Quit should be entered followed by carriage return This will terminate the command The contents of the address offset flag AD and the User Interrupt Mode IM can also be displayed and modified in this same manner The registers being examined and modified are memory locations in which the indicated registers are saved at the start of the program and at each breakpoint and from which they are restored at each Go command The seauence in which the registers are displayed when they are stepped from one to the next is IM A B C D E F H L I D E F H L IX IY PC SP ADR Set lt address gt lt data gt lt data gt lt data gt L The Set command stores the given data words into seguentlal memory locations starting at the given address Trace MR Mw PR PW The Trace command is used to specify which types of bus transactions will be stored in the Real Time Storage Module The Trace command will accept from one to four of these parameters in any order If no parameters are specified the command resets the Trace and no transactions will be stored At power on the system automatically specifies a Trace of all four parameters All of the above commands may be abbreviated to their first letter or may have the command spelled out
13. d debug a program to be executed in Monitor mode After assembling the program a procedure file must be created With the RIO system this is done by linking the assembled object file When using the GET command from the Debugger ADRFLG described in 4 2 should be set to zero so that no offset is added to the load address If this flag is not reset then the program must be moved down l000H bytes after loading Once a procedure file has been created it is executed from the executive by simply typing its name Examples RIO System 5 MONITOR PROGRAM PASS 1 COMPLETE 0 ASSEMBLY ERRORS ASSEMBLY COMPLETE LINK 4000 MONITOR PROGRAM LINK COMPLETE MONITOR PROGRAM execution begins Non Maskable Interrupt NMI and RST 38 may be trapped by a user program The variables NMIDSP system RAM address EEEH and RSTDSP system RAM address FECH specify the addresses to branch to on these conditions All registers are preserved and the address at which the condition occurred 15 on the stack Both of these variables are initialized to 0 on reset 13 4 6 DEBUGGING A PROGRAM WHICH IS INTENDED TO RUN IN MONITOR MODE The DEBUG services of the Development System are all designed for use with programs running in the User mode Thus it is necessary to run in User mode while debugging This can be accomplished by using the following procedure after the program has been prepared for execution in the Monitor mode as described
14. given l is assumed After a NEXT command hitting successive carriage returns will cause execution and tracing of the following instructions Port lt n gt An input is done from port n and the value is displayed on the terminal The user can then output to this port by entering a hex value followed by a carriage return Pulse MRIMW MI Address lt nl gt PRIPW Port lt 2 gt 111 Data n3 Mask lt n4 gt The Pulse command is exactly like the Break command however program execution is not halted when the specified condition occurs Instead a sync pulse is generated at the BNC co axial connector at the rear of the Development System cabinet Quit This command will cause the user to leave the Debug environment and return to OS or to another specified routine see Section 4 2 If OS has not been loaded the Quit command will not be interpreted and the system will respond with a Register lt register name IM AD The Register command permits the contents of the indicated register interrupt mode flag or address flag to be examined and modified If no register name is given all registers will be displayed on one line If a register name is given individual registers will be displayed starting with the one given The register name will be typed followed by its contents followed by a space If it is desired to change the contents of that register the new contents can be typed m
15. he contents of that location the new contents can be typed carriage return either alone or after the new contents wili cause the next seguential location to be displayed A O for Quit followed by a carriage return will terminate the command FILL addrl lt addr2 gt data Stores the data byte given into all memory locations from addrl to addr2 This range must not include any areas of ROM or non existent memory GO address The Go command will branch to the given address thus executing the user s program If no address is given Go will cause a branch to the last stored PC thus continuing program execution where it was last interrupted In either case all registers are restored before branching The Go command causes a switch to User mode History lt n gt During execution of a user program events are stored in the Real Time Storage Module Each event consists of the storing of the address bus the data bus and the control bus The History command causes the last n events that were stored in the Real Time Storage Module during user program execution to be printed at the terminal If no parameter is entered the system will print all events that have occurred Since the last break n may be between 0 and OFFH The format for the output from the storaqe module is A DC oo where A 16 bit Address Bus 7 D 8 bit Data Bus C 8 bit Control Bus Information The control Bus information is interpreted
16. lephone 408 446 4666 TWA 910 338 7621 03 3030 01
17. mand B MR A 2001 will cause the system to break when the first Memory Read from address 2001 occurs The third parameter allows the user to specify an 8 bit data field that must match the processor s data bus for a break to occur For example B MW D 32 would break if a 32H is written to any memory location The mask parameter can be used with the data parameter and causes specified bit positions to be ignored if the mask bit is zero for these positions I If the Break command is issued with no parameters it clears any existing Breakpoint set up Note that Breakpoints are disabled when executing in Monitor mode j COMPARE lt nl gt lt n2 gt lt n3 gt The Compare command is used to compare the contents of two blocks of memory nl and n2 specify the starting addresses of the two blocks while n3 specifies the number of bytes to be compared If any locations of the two blocks differ the addresses and contents of those locations are printed on the user s terminal w Display lt address gt lt number o bytes gt The display command displays on the terminal the contents of memory locations starting at the given address for the given number of bytes If no number of bytes is given memory locations will be displayed one oat a time with an opportunity to change each byte For each byte the address will be typed followed by the contents of the location followed by a space If it is desired to change t
18. mple Carriage return the bootstrap logic is entered If not the Debug command scanner is entered The bootstrap procedure involves reading in 128 bytes of data then transferring control to it This data will be read from a fixed sector on the system drive Drive 0 2 0 FLOPPY DISK DRIVER The floppy driver FLOPPY is used to read and write from the disk The FLOPPY routine is only capeble of accessing preformatted Zilog diskettes The driver accepts a standard parameter vector as follows IY O IGNORED IY 1 REQUEST TYPE OF ACTION NEEDED 1Y 2 1Y 3 DATA TRANSFER ADDRESS IY 4 IY 5 DATA LENGTH IN BYTES IY 6 1Y 7 COMPLETION RETURN ADDRESS 8 9 ERR R RETURN ADDRESS IY 10 COMPLETION CODE 11 12 DISK ADDRESS 1 There are two valid requests for the floppy driver They ere RDBIN OAH which will read data from the disk to the area pointed to by the data transfer address and WRTBIN O0EH which will write data from the area pointed to by the data transfer address to the disk If the reauest code is increased by one then the driver will return as soon as the recuest has been initiated permitting it to continue under interrupt control and jumping to the completion return address after the operation is complete The routine at the completion return address should act as an interrupt routine except that it should not execute an RETI simple RET should be used If the request code is used as given FL
19. ocation to 21H C r _ Note that both of the above addresses are in System RAM thus they are equivalent to addresses FFC3H and FFC2H when looking at the user address space These characters are also changed when OS is bootstrapped to its defaults or by the Set command in RIO OS This means that 1 Debug is entered from OS the characters may not function in the same way The Development Svstem interfaces to any terminal using a standard 8 bit ASCII asynchronous transmission mode with or without parity on RS 232 or 20 ma current loop The interface will operate at the following speeds 9600 baud 4800 baud 2400 baud 1200 baud 600 baud 300 baud 200 baud 150 baud 134 5 baud 110 baud 75 baud 50 baud The entry point for the TTY driver is at location 08 4 0 DEBUG ENVIRONMENT 4 1 DEBUG COMMANDS In the following command descriptions angle brackets lt gt are used to enclose descriptive names for the quantities to be entered and are not actually to be entered Square brackets enclose optional quantities Vertical bar indicates a choice may be made e q A B means either A or B may be specified Capital letters specify the minimum acceptable abbreviation of a command Parentheses are used for grouping repetitive items Por example a valid Display command see below would be D 1000 10 The PROM Debug environment offers the following commands Break MR MW Ml
20. or The Track address in the sector header did not aaree with the head position C5H CRC Error The Cyclic Redundancy Checker CRC indicates one or more data bits in error o Os P S The disk address at which the transfer 1s to begin is represented as a track address from 0 to 77 decimal and a Sector address from 0 to 31 decimal Additionally three bits indicating which of the two possible drives is to be used for the transfer are carried as the top three bits of the sector address The drives are numbered 0 and 1 The track address is considered to be the most significant part of the disk address and therefore goes in IY 12 while the sector address is considered to be the least significant and therefore goes in 11 The entry point for the floppy driver is at location OBFDH 3 0 TTY DRIVER The TTY driver is used to read and write from the terminal On entry IY should be pointing to a standard parameter vector identical in format to that used by FLOPPY with the exception of course of the last field disk address which is ignored Because of the differences of the hardware devices in use the operation of these routines 15 necessarily different The significance of parameters to TTY is as follows There are four requests handled by the terminal driver These are RDBIN O0AH WRTBIN O
21. r the operation The routine at this address should act s an interrupt routine except that it should not execute an RETI a simple RET should be used Tf one is not added to the request TTY will return normally after the operation is completed In this case the completion return address 1s ignored If an error occurs and the return address is non zero the routine at that address will be called It may take whatever action is appropriate and return If the address is zero the return is normal except for the setting of the completion code Bit 7 of the completion code is set when the operation is completed Bit 6 is set to indicate that an error occurred The only error condition returned is Invalid Operation This will occur for request codes greater arithmetically 7 than those honored lower request codes return uf complete with no error but with no effect either The two line edit commands interpreted by the TTY driver delete last character and delete current line can be changed from the Debug environment as follows To change the Delete last character command Set memory location OFC3H to the ASCII code for the character desired For example to make the the character delete one would set the location to 40H To change the Delete current line command Set memory location OFC2H to the ASCII code for the character desired For example to make I the line delete one would set the l
22. t FCOH In this location the number of line feeds which will be inserted after a carriage return is stored Modifying the line feed count permits automatic multiple spacing LFCNT is initialized to 1 PROMPT Prompt Character In this location the character output by the TTY routine before reading a line from the terminal 15 stored Modifying the prompt character permits various levels of interactive software to identify themselves in each command query Prompting can be effectively eliminated by setting this location to a null character ASCII 0 PROMPT is initialized to LINDEL Line Delete FC2H In this location the character interpreted by the TTY routine as a line delete is stored When it is encountered in the ASCII input stream from the terminal this routine purges the buffer and continues reading the input stream LINDEL is initialized to 21H CHRDEL Character Delete FC3H In this location the character interpreted by the TTY routine as a character delete 16 Stored When it is encountered in the ASCII input stream the last character entered is purged from the input buffer Multiple character deletes may be used to delete the last n characters entered CHRDEL is initialized to 40H BRKFLG Breakpoint Flag Bit 5 of this location is used to determine the return address for the QUIT command Bit 7 is used to signal the existence of an external breakpoint handler see Section 4
23. to any desired length The first character typed on a new line will be taken as the key to which command is being invoked If a command is not understood a will be typed and a new command requested 11 numbers may be entered in free form hex with leading zeros omitted If more than four hex digits are entered the last four will form the number used All fields are blank delimited 10 Il 4 2 DEBUG INTERFACE There are two ways in which an external routine can interface with the PROM Debug package With either a flag is set and a return address is stored in an associated location The first way 1s to make a call into the Debug environment thus passing control to the Debug command interpreter until a Quit command is issued This is done by setting bit 5 of location OFC4H BRKFLG in system RAM FFC4H in user space storing the return address at locations 0 8511 FFB5H FFB6H in user space EXTRET and jumping to the Debug command interpreter at OBFAH The second method is used when an external routine is used to handle breakpoints If bit 7 of OFC4H FFC4H in user space is set the occurrence of a breakpoint will cause a jump to the location stored at FC5H OFC6H FFC5H FFC6H in user Space BRKRTN 11 4 3 MEMORY MAPPING The Development System hardware provides two operating modes Monitor mode
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