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MONITOR2P1.A99
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MONITOR2P1.A99
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;
;-----------------------------------------------------------------------
; MONITOR AND FDC INTERFACE ROUTINES for the TI99000 SBC
;
; Written by Alex Cameron
;
; The monitor routines are called from a DOS or other
; programme to perform Console I/O and Disc I/O similar
; to a BIOS.
;
; Version 2.1 14th May 2020 - The year of the Corona Virus
; Version 2.2 3rd February, 2024 -
; Combined partial set of TIBUG commands into Monitor
; and targeted for the SBC ROM.
; RAM ADDRESS: EC00H-EFFFH;
; ROM ADDRESS: F000H-FFFFH
;
;
;---------------------------------------------------------------------
;
R0 EQU 0
R1 EQU 1
R2 EQU 2
R3 EQU 3
R4 EQU 4
R5 EQU 5
R6 EQU 6
R7 EQU 7
R8 EQU 8
R9 EQU 9 ;Use to index workspace pointer not stack overflow
;SL EQU R9 ;STACK LIMIT
R10 EQU 10
SP EQU R10 ;STACK POINTER
R11 EQU 11
R12 EQU 12
PORT EQU R12 ;IO BASE
R13 EQU 13
R14 EQU 14
R15 EQU 15
ST EQU 15
;
;***************************************************
;
; DEFINE SOME XOP'S.
; ALL PROGRAMMES USE THESE XOPS
;
;****************************************************
;
DXOP PUSHREG,4 ;PUSH RANGE OF REGISTERS TO STACH
DXOP POPREG,5
DXOP CALL,6
DXOP RET,7
DXOP PUSH,8 ;PUSH SINGLE REGISTER
DXOP POP,9
DXOP WHEX,10 ;WRITE OUT A 16 BIT HEX VALUE
DXOP RHEX,11 ;READ IN A 16 BIT HEX VALUE
DXOP WRITE,12 ;WRITE CHAR IN MSB
DXOP READ,13 ;READ CHAR IN MSB
DXOP MESG,14 ;OUTPUT NULL TERMINATED MESSAGE
DXOP DEBUG,15 ;DEBUG CURRENT LOCATION & STORE INTO DEBUG_BUFFER
;
; SOME EQUATES
;
SHELL: EQU 0C300H ;ADDRESS OF SHELL
MONORG: EQU 0F000H ;ORIGIN FOR THIS MONITOR
INTVEC: EQU 08H
LOADER: EQU SHELL - 1024 ;THIS IS THE LOADER ADDRESS
;
;--------------------------------------------
;LOW MEMORY VECTORS INTO MONITOR, SHELL AND DOS
;ALLOWS APPLICATIONS TO USE A FIXED SYSTEM VECTOR
;RATHER THAN BEING ASSEMBLED WITH ABSOLUTE ADDRESSES
;SO FOR EXAMPLE MONITOR IS NOT KNOW TO BDOS
;---------------------------------------------
;
;SHELL_ADDR: EQU 080H ;ORGANISED 2 WORDS AS WP:PC VECTOR
;BDOS_ADDR: EQU 084H ;POINTER TO BDOS ORGANISED 2 WORDS AS WP:PC
MON_PTR: EQU 088H ;MONITOR VECTOR. PROGRAMMES CAN USE THIS
;CMDLINE_PTR: EQU 0A0H ;POINTER TO COMMAND LINE
;CMDLINE_LEN: EQU 0A2H ;COMMAND LINE LENGTH
;SYSBUFF_PTR: EQU 0A4H ;POINTER TO SYSTEM BUFFER (512 BYTES)
;FREEMEM_ADDR: EQU 0A6H ;START OF FREE MEMORY
;
; DECLARE VARIABLES THAT NEED RAM
;
MONITOR_RAM: EQU MONORG-0300H
AORG MONITOR_RAM
STACKP: EQU MONITOR_RAM-2 ;STACK POINTER SITS ON TOP OF RAM
INTWP0: BSS 25*16 ;7 INT, 16 WORKSPACES OF 16 BYTES EACH
BOOT_WP: BSS 32 ;THIS IS BOOT TEMPORARY WORKSAPCE
WORKSP: BSS 32
;
; NOTE THIS IS USED BY DEBUG TO STORE MULTIPLE DEBUG POINTERS TO
; PROGRAMMES CALLING DEBUG
;
DEBUG_NAME: BSS 9 ;;NAME OF MODULE 8 CHARS LONG NULL TERMINATED
EVEN
DEBUG_BUFFER:
BSS 20 ;DEBUG TRACE LIST
;DISC_RAM: EQU $ + 0
;
;-- RAM BASED IO PARAMETER BLOCK
;
EVEN
DISC_PARAM EQU $ + 0
FDCSTATUS WORD 0 ;OPERATION STATUS
BYTESRD WORD 0 ;A DEBUGGING FEATURE FOR NUMBER OF BYTES READ
TRKSTAT WORD 0 ;VERIFIED TRACK STATUS
SECSTAT WORD 0 ;VERIFIED SECTOR STATUS
IOPTR WORD 0 ;IO BUFFER POINTER IN R8 OF DRQ INT
TRACK WORD -1 ;CURRENT SELECTED DRIVE TRACK NO
TRKTAB WORD 0,0 ;DRIVE 1, 2 => ;HEAD POSITIONS FOR 2 DRIVES
TYPTAB WORD 0,0 ;DRIVE 1, 2 => BIT 1 1=SD,0=DD;BIT 2 1=MINI=5.25, 0=MINI=3.5
SECTOR WORD 0 ;CURRENT SECTOR NO.
SIDE WORD 0 ;SIDE SELECT BIT
CMDTYP WORD 0 ;COMMAND TYPE
DSKTYP WORD 00B ;CURRENT UNIT / DENSITY INDICATOR (USING TYPTAB ABOVE)
DRIVE WORD 0 ;CURRENT DRIVE
FNDTRY WORD 7 ;FIND TRACK RETRY COUNT
MAXRWT WORD 5 ;NUMBER OF RETRIES ALLOWED
RWTRY WORD 5
ERRTYP WORD 0 ;ERROR STATUS FOR READ/WRITE ROUTINES
OPCOMP WORD 0 ;CLEARED WHEN IF DISK OPERATION COMPLETE
DRVRDY WORD 0 ;CLEARED WHEN DRIVE READY TIME OUT
SELCPY WORD 0 ;COPY OF DATA IN SELECT/MUX OUTPUTS
TIMEOUT WORD 1 ;N * 16MS DURATION
; EVEN
DISC_INUSE WORD 0
RAM_SIZE EQU $ - DISC_PARAM
;-----TESTING CODE
; AORG 0100H
; BLWP @TEMP
;TEMP: WORD WORKSP
; WORD INITIAL
;----- END TESTING CODE
;
; LOCATE THE MONITOR IN MEMORY
;
AORG MONORG
;
; INITIALISATION
;
;
;************************************************************************************
;
; USE BLWP @MONITOR TO INITIALISE MONITOR VECTORS AND INTERRUPTS
;
; NOTE ALL PROGRAMMES OR MODULES MUST SET THEIR WORSPACE
; POINTERS AND STACKS BEFORE CALLING, e.g.
;
; AORG 0100H
; LWPI WORKSP
; BLWP @INIT_MONITOR
; <INITIALISED MONITOR WILL RETURN HERE>
;
;
;*************************************************************************************
;
INIT_MONITOR:
WORD WORKSP ;THIS IS MONITOR WORKSAPCE
WORD INIT_VECTORS ;INITIALISE ALL XOP, INTERRUPT AND ENTRY VECTORS
BOOT_ADDR: B @BOOT ;PERFORM A COLD BOOT - POS IN TABLE HELPS DEBUGGING
B @CIN ;CHAR IN
B @COUT ;CHAR OUT
B @SELDSK ;SELECT A DISK DRIVE
B @RECAL ;RECALIBRATE DRIVES
B @SEEK ;SEEK THE TRACK IN R3
B @RDREC ;READ SELECTED SECTOR
B @WRREC ;WRITE SELECTED SECTOR
B @RDID ;READ TRACK ID ADDRESS
B @WBOOT ;PERFORM A WARM BOOT
B @RDTRK ;READ A TRACK OF DATA
B @WRTRK ;WRITE A TRACK OF DATA
;
;**********************************************************
;
; DMA PARAMETER BLOCK DEFINITIONS
; INDEXED DEPENDING ON READ(0), OR WRITE(1) COMMAND
;
;************************************************************
;
CMDTBL: STCR *R8+,BYTEWIDE ;BYTE WIDE FDC DATA READ
LDCR *R8+,BYTEWIDE ;BYTE WIDE FDC DATA WRITE
;
;--REGISTERS IN INTERRUPT 3 WORKSPACE
;
DMACMD SET 2*R9+INTWP2 ;CURRENT COMMAND
DMAADDR SET 2*R8+INTWP2 ;REGISTER HOLDING SOURCE ADDRESS
DMAPORT SET 2*R12+INTWP2 ;IO BASE REG I.E. DATAREG
CRLF BYTE 0DH,0AH,0
EVEN
;
;FDC 1797 COMMANDS
;
RDCMD: EQU 10001000B ;READ CMD
RIDCMD: EQU 11000000B ;READ ID
WRCMD: EQU 10101000B ;WRITE CMD
WTCMD: EQU 11110000B ;WRITE TRACK
RTCMD: EQU 11100000B ;READ TRACK
SEKCMD: EQU 00011100B ;SEEK CMD
RSTCMD: EQU 00001100B ;RESTORE COMMAND
FINTCMD: EQU 11010000B ;FORCE INTERRUPT COMMAND
SICMD: EQU 01011100B ;STEP IN COMMAND
SOCMD: EQU 01111100B ;STEP OUT COMMAND
;
;--FDC 1797 IO REG LOCATIONS
;
FDC1797: EQU 8000H ;IO BASE REGISTER- BYTE TRANSFER WITH MSB SET
STSREG: EQU FDC1797+0 ;MAIN STATUS REG
CMDREG: EQU FDC1797+0 ;COMMAND REGISTER
TRKREG: EQU FDC1797+2 ;TRACK REGISTER
SECREG: EQU FDC1797+4 ;SECTOR REGISTER
DATREG: EQU FDC1797+6 ;DATA REGISTER
;
;
;--PORTS ETC.
;
SELMUX: EQU 0 ;SELECT CONTROL PORT
TYPMUX: EQU SELMUX + 2*5 ;START AT BIT 5
BYTEWIDE: EQU 2 ;PARALLEL I/O DONE IN BYTES (UNIQUE TO 99105)
;
;
; THESE ARE THE TIBUG BASIC COMMANDS, SUCH AS:
; QBOOT, ADDR G(O), ADDR O(UTPUT), W(ORKSPACE), R(EGISTERS), ADDRESS O(PEN).
;
; TIBUG WILL BE THE DEFAULT ENTRY POINT.
; BOOTING IS EFFECTED BY ISSUING THE Q(QBOOT) COMMAND
;
TIBUG_ENTRY:
BANNER MESG @MESS00 ;_PRINT ">> TMS9900 TIBUG <<"
; READ R1 ;READ ANY RUBBISH
PROMPT MESG @MESS01 ;PRINT PROMPTER
BL @HEXIN ;OBTAIN ADDRESS IN R2 AND INSTRUCTION IN R1
LI R4,19 ;20 POSSIBLE INSTRUCTIONS
MON01 CB @INTAB(R4),R1 ;SEARCH INTAB
JEQ MON03
DEC R4
JOC MON01
MON02 MESG @MESS02 ;PRINT " ??"
JMP PROMPT
MON03 SLA R4,1 ;BRANCH TO APPROPRIATEE ROUTINE
MOV @SUBTAB(R4),R4 ;
MOV R3,R3 ;TEST HEXIN FLAG
B *R4
;
; TIBUG INSTRUCTION TABLE
;
HEXTAB TEXT '0123456789ABCDEF'
NUMTAB TEXT '0 1 2 3 4 5 6 7 8 9 101112131415'
INTAB BYTE 1AH ;CONTROL Z(CLEARS SCREEN)
TEXT '//QUGMZOWRPXLHST/. '
EVEN
SUBTAB WORD BANNER,0,0,QBOOT,HEXLOAD,GO,MOVE,FIND,OUTPUT,WP,PRINT_REGS,PRINT
WORD XCUTE,LOWW,SETBP,SSTEP,TRACE,CHAR,INSTANT,OPEN
;
; COMMANDS IMPLEMENTED IN DISC_MONITOR
; REGIST, OPEN, GO AND QBOOT.
;
;MASK32 WORD 001FH
MASK15 WORD 000FH
;MASK8 WORD 0007H
MASK3 WORD 0003H
;
; DUMMY LIST
;
SSTEP: JMP PROMPT; NULL COMMAND
SETBP: JMP PROMPT; NULL COMMAND
TRACE: JMP PROMPT; NULL COMMAND
CHAR: JMP PROMPT; NULL COMMAND
MOVE: JMP PROMPT; NULL COMMAND
FIND: JMP PROMPT; NULL COMMAND
XCUTE: JMP PROMPT; NULL COMMAND
LOWW: JMP PROMPT; NULL COMMAND
INSTANT: JMP PROMPT; NULL COMMAND
PRINT: JMP PROMPT; NULL COMMAND
;
;ONLY THESE ONES HAVE BEEN IMPLEMENT WITHIN THE DISC_MONITOR ROM. AS
;THE ADDRESS SPACE HAS BEEN TAKEN UP WITH THE DISC-IO AND THE OTHER FUNCTIONS
;CAN BE EASILY IMPLEMENTED WITH DISC BASED PROGRAMMES.
;
;QBOOT: JMP PROMPT; NULL COMMAND
;GO: JMP PROMPT; NULL COMMAND
;OUTPUT: JMP PROMPT; NULL COMMAND
;WP: JMP PROMPT; NULL COMMAND
;PRINT_REGS: JMP PROMPT; NULL COMMAND
;OPEN: JMP PROMPT; NULL COMMAND
;
; MESSGES AND OTHER EQUATES
;
MESS00 BYTE CR,LF
TEXT '<TMS9900 DISC MONITOR V2.1>'
; BYTE 0
MESS01 BYTE CR,LF
TEXT '>'
BYTE 0
MESS02 TEXT '??'
BYTE 0
MESS03 BYTE LF,CR,LF
TEXT ' '
BYTE 0
MESS04 TEXT ' = '
BYTE 0
MESS05 TEXT ' STACK OVERFLOW AT'
BYTE 0
CR: EQU 0DH ;CARRIAGE RETURN
LF: EQU 0AH ;LINE FEED
EVEN
;
;*********************************
; SUPPORT ROUTINES FOR INPUT AND OUTPUT
;**********************************
;
;
; SUBROUTINE HEXIN
; INPUTS A HEX NO. INTO R2
; AND INSTRUCTION INTO R1
; (INSTRUCTION ' ' INSERT AND MOVE TO NEXT ADDRESS
; (INSTRUCTION '-' INSERT AND MOVE TO PREVIOUS ADDRESS
; THE HEX INDEX USES THE TRANSLATE TABLE HEXTAB TO IDENTIFY THE HEX DIGIT.
; THE LAST CHARACTER, EITHER SPACE OR - BREAKS THE CYCLE AS THEY ARE NOT IN THE HEXTABLE
;
; USES R1,R2,R3,R4
;
HEXIN: CLR R1
CLR R2
SETO R3 ;SET FLAG
HEXIN0 READ R1 ;GET CHARACTER
WRITE R1 ;PRINT CHARACTER
LI R4,15
HEXIN1 CB @HEXTAB(R4),R1
JNE HEXIN2
CLR R3 ;CLEARS FLAG
SLA R2,4 ;SHIFTS HEX DIGIT INTO R2
SOC R4,R2
JMP HEXIN0
HEXIN2 DEC R4
JOC HEXIN1 ;SUBTRACTING 1 FROM 0 DOES NOT RESULT IN CARRY
MOV R3,R3 ;TEST HEXIN FLAG
RT ;RETURN FROM BL
;
; SUBROUTINE HEXOUT ;OUTPUT CONTENTS OF R2
; USES R0,R1,R2,R3
;
;HEXOUT WRITE @MESS03+7 ;PRINTS " "
;HEXOUT0 PUSHREG R3 ;SAVE R0-R3
;HEXOUTX CLR R0
; LI R3,4
;HEXOUT1 SRC R2,12
; MOV R2,R1
; ANDI R1,000FH
; MOVB @HEXTAB(R1),R0
; WRITE R0
; DEC R3
; JNE HEXOUT1
; POPREG R3 ;RESTORE R3-R0
; RT
;
DOT: BYTE '.',0
PLUS BYTE '+',0
LOADERR: TEXT 'LOAD ERROR'
BYTE 0
EVEN
;
;**********************************************
; XOP WP ENTRY POINTS
;**********************************************
;
XOPTAB WORD XOPWP0,XOP0,XOPWP1,XOP1,XOPWP2,XOP2,XOPWP3,XOP3
WORD XOPWP4,XOP4,XOPWP5,XOP5,XOPWP6,XOP6,XOPWP7,XOP7,XOPWP8,XOP8
WORD XOPWP9,XOP9,XOPWP10,XOP10,XOPWP11,XOP11
WORD XOPWP12,XOP12,XOPWP13,XOP13,XOPWP14,XOP14,XOPWP15,XOP15
;
INTTAB WORD INTWP2,INTDRQ,INTWP3,INTREQ ;FDC1797 INTERUPT VECTORS
WORD INTWP4,INTTIMER ;TIMER INTERRUPT
;
EVEN
;
; NOTE. APPLICATIONS MUST CALL WITH THEIR WP POINTERS SET
; THIS CALL IS USED TO SET UP MONITOR
; CALLED USING BLWP @MONITOR
;
INIT_VECTORS:
RSET ;CLEAR INTERRUPT MASK
LWPI WORKSP ;USE MONITOR LOCAL WORKSPACE
LI SP,STACKP ;STACK FOR LOCAL MONITOR USE
LI R0,MON_PTR ;SET UP THE MONITOR POINTER
LI R1,MONORG
MOV *R1+,*R0+ ;MOVE WORKSPACE POINTER
MOV *R1+,*R0+ ;MOVE MONITOR INITIALISATION ADDRESS
;
;************************************************************
;
; SWTICH TO MONITOR XOP VECTORS RATHER THAN TIMON ROM
; THIS MEANS THAT ALL PROGRAMMES THAT USE XOP WILL USE THE
; THE XOP IMPLEMENTATIONS DEFINED IN MONITOR THAT IS HERE!
;
;************************************************************
LI R0,INTVEC ;SET UP INTERRUPT VECTORS
LI R1,INTTAB ;ONLY INT 2 TO 4
INT1: MOV *R1+,*R0+
MOV *R1+,*R0+
CI R0,INTVEC+12
JNE INT1
LI R0,40H ;INITIALISE XOP-START AT XOP0
LI R1,XOPTAB
INIT2: MOV *R1+,*R0+
; NOP ;WTRITE PROTECT
MOV *R1+,*R0+
CI R0,80H ;FINISHED?
JNE INIT2 ;NO
;
;Now initialise DISC and OTHER RAM. FIRST ZERO THEN COMPY PRESETS
;
LI R0,RAM_SIZE
LI R1,DISC_PARAM
CLR R2
INIT_RAM MOVB R2,*R1+
DEC R0
JNE INIT_RAM
;
; NOW MOVE PRESETS
;
SETO R0
MOV R0,@TRACK
LI R0,5
MOV R0,@MAXRWT
MOV R0,@RWTRY
AI R0,2
MOV R0,@FNDTRY
INC @TIMEOUT ;THIS JUST SETS TIMEOUT TO 1 AS IT IS ALREAY 0
;
LIMI 7 ;ENABLE INTERRUPTS
B @BANNER
;
;************************************************************
;
; WARM BOOT ASSUMES A COLD BOOT HAS ALREADY OCCURED
; AND DISC IS JUST BEING CALIBRATED TO A KNOWN STATE
;
;************************************************************
;
WBOOT: SETO @TRACK ;INVALIDATE TRACK
CLR @SECTOR
CLR @DRIVE
CLR R2 ;SELECT BOOT DRIVE
CALL @SELDSK ;SELECT DISK
CALL @RECAL ;RECAL
RET ;RETURN FROM BLWP
;
;*********************************************************
;
; BOOT ASSUMES MONITOR HAS BEEN INITIALISED AND SO
; THE FDC AND INTERRUPT VECTORS ARE IN VALID
;
;***********************************************************
;
BOOT: LWPI BOOT_WP ;WORKSP CAN'T BE THE SAME AS MONITOR THIS IS A TEMPORARY WORKSPACE
LI SP,STACKP
;
;---NOW TRY TO BOOT FROM TRACK 0 SECTOR 1
;
MESG @BMSG2
CLR R2
CALL @SELDSK ;SELECT DRIVE A
JNE BOOT2
CALL @RECAL ;RECAL DRIVE A
LI R3,1 ;BOOT SECTOR
LI R4,LOADER ;USE THIS AREA TO BOOT
CALL @RDREC
JNE BOOT2
B @LOADER ;LET THERE BE LIFE - LOAD THE SYSTEM
;
; --BOOT ERROR
;
BOOT2 MOV R1,@FDCSTATUS
MESG @BMSG1
B @PROMPT
;
BMSG1 TEXT '--Boot error'
BYTE 0DH,0AH,0
EVEN
BMSG2 TEXT '--Booting....'
BYTE 0DH,0AH,0
EVEN
;
;****************************
;
; CHAR IN (MSB OF R1)
;
;*****************************
CIN READ R1 ;GET CHAR
RET
;*******************************
;
; CHAR OUT (MSB OF R2)
;
;********************************
;
COUT CLR R1
MOVB R2,R1 ;COPY CHAR TO R1
WRITE R1 ;OUTPUT IT
RET
;
;************************************************
;
; SELECT THE DRIVE IN R2
;
;************************************************
;
SELDSK: CI R2,1 ;MAXIMUM NUMBER IS 2
JGT SELRET
CALL @DRVSEL ;SELECT THE DRIVE
CALL @READY ;EMIT NEW SELECT BITS AND TEST READY
JNE SELRET
MOV R1,R1
JNE SELRET ;NOT READY
MOV @DRIVE,R3 ;SAVE LAST UNIT
SLA R3,1 ;TWO BYTES PER WORD
MOV R2,@DRIVE ;NEW UNIT
MOV @TRACK,@TRKTAB(R3) ;STORE PREVIOUS DRIVES TRACK POSITION
MOV @DSKTYP,R1
ANDI R1,00000011B
MOV R1,@TYPTAB(R3) ;STORE PREVIOUS DISK TYPE
LI PORT,TRKREG
SLA R2,1 ;MULTIPLY BY 2, IE TWO BYTES PER WORD
MOV @TRKTAB(R2),R1 ;GET LAST KNOWN HEAD POSITION FOR NEW DRIVE
MOV R1,@TRACK ;SAVE THE DRIVE'S NEW POSITION AND
SWPB R1
LDCR R1,BYTEWIDE ;OUTPUT TO THE 1797 FDC
MOV @DSKTYP,R1 ;DENSITY BITS ETC
ANDI R1,11111100B ;MERGE IN NEW DENSITY CONTROL BIT
SOC @TYPTAB(R2),R1
CALL @SETDENS ;SET DENSITY CONTROL BIT
SELRET: BLWP @SETTIMER ;SET DRIVE TIMER
RET
;
; OUTPUT SELECT BITS
;
DRVSEL: ANDI R2,00000011B ;MAKE SURE IT'S IN RANGE
MOVB @SELTAB(R2),@SELCPY ;STORE NEW STATE OF SELECT/MUX PORT
RET
;
SELTAB: BYTE 00000001B ;BITS FOR UNIT # 0 (INCLUDE DENSITY BIT)
BYTE 00000010B
BYTE 00000100B
BYTE 00001000B
;
; TURN OFF ALL DRIVES
;
DESELECT: LI PORT,SELMUX
CLR R0
LDCR R0,00000101B ;CLEAR DISKS
RET
;
; EMIT MUX BITS AND SEE IF DRIVE IS READY
;
READY: LI R1,1
MOV R1,@DISC_INUSE ;SET DISK-ACTIVE FLAG
LI PORT,SELMUX ;SELECT PORT
CLR R1
LDCR R1,5 ;CLEAR SELECT BITS FIRST
LDCR @SELCPY,6 ;;OUTPUT CURRENT DRIVE SELECT/MUX 5 BITS PLUS DENSITY
MOV @TIMEOUT,R0
CI R0,1
JNE READY1
CALL @FORCE
ANDI R1,10000000B
JNE READY2
READY1: CALL @WAITRDY
CALL @FORCE ;CLEAR CONTROLLER AND TEST DRIVE
ANDI R1,10000000B ;READY FLAG
READY2: MOV R1,@FDCSTATUS
RET
;
;
FORCE: LI R1,FINTCMD ;FORCE INTERRUPT COMMAND
CALL @EXCMD
LI PORT,STSREG ;GET RESULT BYTE AS NO INTERRUPT
STCR R1,BYTEWIDE ;HAS OCCURRED
SRL R1,8
RET
;
;*****************************
;
;--RECAL IS JUST SEEK TO TRK ZERO (RECAL IS HANDLED THERE)
;
;*****************************
;
RECAL: LI R3,0 ;RECAL COMMAND
SETO @TRACK ;INVALIDATE TRACK SEEK WILL ZERO
CALL @SEEK ;TRACK REGISTER IS ZEROED
ANDI R1,10000001B
RET
;
;*******************************
;
;READ ID FIELDS
;
;******************************
;
RDID MOV R4,@IOPTR
CALL @READY
JNE RDIDX
LI R2,RIDCMD
CALL @RDWRT ;READ ID RECORD INTO (R4)
JNE RDIDX ;EXIT IF DISK ERROR
MOV @IOPTR,R4
AI R4,6 ;POINT TO 7TH BYTE AFTER ID RECORD
MOV @DSKTYP,*R4 ;STORE DISK TYPE THERE
RDIDX BLWP @SETTIMER
RET
;
;****************************
;
;READ A RECORD
; R3 HOLDS SECTOR
; R4 HOLDS BUFFER POINTER
;
;*****************************
;
RDREC: MOV R4,@IOPTR
MOV R3,@SECTOR
CALL @READY
JNE RDRECX ;EXIT IF DRIVE NOT READY
LI R2,RDCMD ;DO A READ COMMAND
CALL @RDWRT
RDRECX: BLWP @SETTIMER
RET ;BIND *SP+ ;RET
;****************************
;
;READ A TRACK
; R3 NOT REQUIRED
; R4 HOLDS BUFFER POINTER
;
;*****************************
;
RDTRK MOV R4,@IOPTR
LI R3,1 ;DUMMY
MOV R3,@SECTOR
CALL @READY
JNE RDTRKX ;EXIT IF DRIVE NOT READY
LI R2,RTCMD ;DO A READ COMMAND
CALL @RDWRT
RDTRKX BLWP @SETTIMER
RET ;BIND *SP+ ;RET;
;
;****************************
;
;WRITE A TRACK
; R3 NOT REQUIRED
; R4 HOLDS BUFFER POINTER
;
;*****************************
;
WRTRK MOV R4,@IOPTR
MOV R3,@TRACK
CALL @READY
JNE RDTRKX ;EXIT IF DRIVE NOT READY
LI R2,WTCMD ;DO A WRITE COMMAND
CALL @RDWRT
WRTRKX BLWP @SETTIMER
RET ;BIND *SP+ ;RET;
;
;******************************
;
;WRITE A RECORD
; R3 HOLDS SECTOR
; R4 HOLDS BUFFER POINTER
;
;*****************************
;
WRREC MOV R4,@IOPTR
MOV R3,@SECTOR
CALL @READY
JNE WRRECX
LI R2,WRCMD
CALL @RDWRT
WRRECX ;BLWP @SETTIMER
RET
;
; SECTOR TRANSLATE (NOT NEEDED ANYMORE MAY 2010)
; SO JUST RETURN
;
;SECTRAN RET ;NOT NEEDED WITH IBM FORMATS
; ANDI R3,000FH
; DEC R3 ; 0 -> 8
; AI R3,SETTBL
; MOVB *R3,R0
; MOV R0,R3
; SRL R3,8
; RET
;SETTBL BYTE 1,4,7,2,5,8,3,6,9 ;1,4,7,9,2,5,8,3,6
; EVEN
;
;
;********************************
;
; COMMON READ AND WRITE ROUTINE (RDWRT)
; ENTER WITH
; R4 -> IO BUFFER
; R3 -> SECTOR
; R2 -> COMMAND TYPE
;
; ASSUME THE CORRECT TRACK IS UNDER THE DISK HEAD
;
; TREAT DRQINT AS A PSUEDO DMA CHANNEL
; BY LOADING THE PORT REGISTER(R12) WITH THE
; I/O ADDRESS AND THE TYPE OF OPERATION I.E. READ/WRITE
; THERE IS NO COUNT AS I RELY ON AN INTERRUPT FROM THE
; FDC1797 TO TERMINATE THE TRANSFER.
;
;*********************************
;
RDWRT: MOV R2,@CMDTYP ;SAVE READ/WRITE/READID COMMAND
MOV @MAXRWT,@RWTRY ;SET READ/WRITE RETRY
RDWRT0: MOV @SECTOR,R3
LI PORT,SECREG ;FDC SECTOR REGISTER
SWPB R3
LDCR R3,BYTEWIDE
;
; SET UP PSUEDO DMA CHANNEL
;
CLR R3 ;INDEX POINTER
LI R0,DATREG ;FDC REG WHERE DATA IS
MOV R0,@DMAPORT
MOV @IOPTR,@DMAADDR ;DMA TRANSFER ADDRESS
MOV @CMDTYP,R1
CI R1,WRCMD ;WRITE COMMAND ?
JEQ RDWRT1 ;YES
CI R1,WTCMD ;WRITE COMMAND ?
JEQ RDWRT1 ;YES
MOV @CMDTBL(R3),@DMACMD ;EXECUTE A READ COMMAND (STCR)
JMP RDWRT2
RDWRT1: INCT R3
MOV @CMDTBL(R3),@DMACMD ;EXECUTE A WRITE COMMAND (LDCR)
;
;
;--MERGE SIDE BIT BEFORE COMMAND IS EXECUTED
;
RDWRT2: CI R1,RIDCMD ;IF ID CMD DON'T NEED TO MERGE
JEQ RDWRT5
MOV @SIDE,R0 ;GET SIDE BIT
SLA R0,1
SOC R0,R1 ;OR IN SIDE BIT INTO COMMAND BYTE
RDWRT5: CALL @EXCMD
ANDI R1,11011111B ;MASK READY/WRITEPROTECT/RNF/CRC/OVERRUN/DRQ/BUSY
JEQ RDWRT4 ;RETURN IN NO DISK IO ERROR
DSKERR: MOV R1,@ERRTYP
CALL @RECOVER ;DO READ/WRITE ERROR RECOVERY
JNE RDWRT3 ;DON'T RETRY IF UN-RECOVERABLE ERROR
DEC @RWTRY ;ELSE DECREMENT AND KEEP TRYING UNTIL 0
JNE RDWRT0
RDWRT3: MOV @ERRTYP,R1
B @IOERR
RDWRT4: RET
;
;***************************************
;
; ATTEMPT TO RECOVER FROM A READ WRITE
; ERROR
;
;****************************************
;
RECOVER MOV R1,R2 ;COPY ERROR CODE TO R2
ANDI R2,10000111B ;ISOLATE READY/OVERRUN/DRQ/BUSY ERRORS
JEQ RECOV1 ;JUMP IF NONE OF THOSE SET
MOV R1,R2
CALL @FORCE ;CLEAR ERROR FLAGS IN 1797
MOV R2,R1
RECOV0 RET
;
; ARRIVE HERE IF CRC OR RNF ERROR
;
RECOV1 MOV R1,R2
ANDI R2,00010000B ;SECTOR ID NOT FOUND
JEQ STEP
ANDI R2,00100000B ;RNF ERROR
JEQ RECOV3
RET ;PROCESS ID NOT FOUND ERROR
;
; ARRIVE HERE ON BAD CRC IN DATA OR ID FIELD
;
STEP: C @RWTRY,@MAXRWT ;CHECK FOR FIRST TIME
JEQ RECOV0
LI R1,SICMD ;STEP BACK AND FORTH
CALL @EXCMD
LI R1,SICMD ;STEP IN TWO TRACKS THEN BACK
CALL @EXCMD
LI R1,SOCMD
CALL @EXCMD
LI R1,SOCMD
CALL @EXCMD
CALL @VERIFY
RET ;RETURN WITH STATUS IN R1
;
; ARRIVE HERE IF RNF ERROR
;
RECOV3 PUSH @DSKTYP ;SAVE DENSITY CONTROL BYTE
CALL @VERIFY ;TRACK VERIFY USING READ - ID
POP R3 ;KEEP PREVIOUS DENSITY BYTE HERE
JEQ RECOV4 ;RETURN IF NO ID MARK FOUND
RET
;
RECOV4 C @DSKTYP,R3 ;SEE IF DENSITY WAS CHANGED BY 'VERIFY'
JEQ RECOV5 ;AND EXIT WITH RNF IF NOT
CLR R1
MOV R1,R1 ;CLEAR R1 TO INDICATE A RETRY SHOULD BE
RET ;DONE NOW THAT DENSITY IS RIGHT
;
RECOV5 LI R1,00010000B ;HEX 0010H
MOV R1,R1 ;INDICATE ERROR DUE TO NON-EXISTENT
RET ; SECTOR OR INDETERMINATE TRACK
;
; VERIFY WE ARE TRACK
;
VERIFY LI R1,RIDCMD
CALL @EXCMD ;READ NEXT ID-MARK TO VERIFY SEEK
ANDI R1,10011001B
JEQ VERFY2 ;JUMP IF ID MARK READ SUCCESSFULLY
CALL @FLIPDENS ;ELSE SWITCH DISK DENSITY CONFIGURATION
LI R1,RIDCMD
CALL @EXCMD ;TRY AGAIN
ANDI R1,10011001B
VERFY2 MOV R1,R5 ;SAVE STATUS OF READ-ID COMMAND
CALL @FORCE ;CLEAR OVERRUN AND DRQ BITS IN 1797
MOV R5,R1
JNE VERFY3 ;RETURN IF ID MARK WAS FOUND
RET
VERFY3 CALL @SETDENS ;ELSE GO BACK TO ORIGINAL DENSITY
MOV R5,R1 ;RETURN WITH ERROR INDICATED
RET
;
;********************************
;
;INTIALISE INT.VECTORS ETC
;
;*******************************
;
INTSYS RET
;
;********************************
;
;RESET FDC
;
;********************************
;
RSET RET
;
;
;*******************************************
;
; SET THE TIME OUT TIMER
;
SETTIMER: WORD INTWP4,SETTIMER+4
LI PORT,0080H
SBZ 20 ;RESET INTERRUPT
LI R8,200 ; 200 X 16MS = 7.0SEC
MOV R8,@TIMEOUT
SBZ 14
SBO 13 ;LOAD INTERVAL TIMER ONLY
LDCR @INTLV2,8
SBO 20 ;ENABLE INTERRUPT
RTWP
;
INTLV2: BYTE 255 ;16.0 MILLISECONDS
EVEN
;
;ALLOW TIME FOR USER TO INSERT DISC (IN FUTURE MAY INCREASE THE TIMEOUT)
;
WAITRDY:
CALL @FORCE
LI PORT,STSREG
SETO @DRVRDY ;ALLOWS US TO TIMEOUT
;
WAITRDY1:
STCR R0,BYTEWIDE
ANDI R0,8000H
JEQ WAITRDY2
;
; WAIT FOR 32uS FOR DRIVE TO BECOME READY
;
DEC @DRVRDY
JNE WAITRDY1
WAITRDY2:
RET
;
;******************************************
;
; SET DENSITY BIT
;
;******************************************
;
SETDENS: MOV R1,@DSKTYP
LI PORT,TYPMUX
SWPB R1
LDCR R1,2 ;OUTPUT CONTROL BITS
CLR R1
MOV R1,R1
RET
;
;******************************************
;
; FLIP DENSITY BIT
;
;******************************************
;
FLIPDENS: MOV R1,@DSKTYP
LI PORT,TYPMUX
SWPB R1
LDCR R1,0 ;OUTPUT CONTROL BITS
CLR R1
MOV R1,R1
RET
;
;;*******************************************
;
; SEEK TO THE TRACK NUMBER HELD IN R3
;
; DRIVE # IS IN DRIVE
;
;********************************************
;
SEEK: CALL @READY ;SEE IF DRIVE IS READY FIRST
JNE SEEKX ;ERROR CONDITION IN OPSTAT
CLR @SIDE ;ASSUME SIDE 0
TCMB R3,0 ;TEST AND CLEAR MSB
STST ST
JNE SEEK0 ;SIDE 0
INC @SIDE ;SIDE 1
SEEK0: C R3,@TRACK ;ARE WE ALREADY THERE ?
JEQ SEEKX ;STAT WILL SHOW OKAY
MOV @TRACK,R1
CI R1,-1 ;IF NOT KNOWN TRACK RECAL DRIVE
JNE SEEK3
CLR @SIDE ;ASSUME SIDE 0
LI R1,RSTCMD
CALL @EXCMD ;EXECUTE RESTORE COMMAND AT SLOWEST STEP SPEED
LI R0,00000100B ;TRK00 BIT
XOR R0,R1 ;MAKE TRK00 BIT TRUE
ANDI R1,10000101B ;NOT FOUND AND NOT READY BITS
JNE SEEKX ;EXIT IF RESTORE CANNOT BE DONE
SEEK2: LST ST
JNE SEEK3
INC @SIDE
SEEK3: ;LI R3,1
;WHEX R3
MOV R3,@TRACK
LI PORT,DATREG ;ALSO PUT IN 179X TRACK REGISTER
SWPB R3
LDCR R3,BYTEWIDE ;OUTPUT TO FDC PORT
LI R1,SEKCMD
CALL @EXCMD
ANDI R1,10010000B ;NOT FOUND & NOT READY ERROR
JEQ SEEKX
SETO @TRACK
SEEKX: MOV R1,R1 ;INDICATE RESULT TYPE
RET
;
;
; RETURN WITH COMPLETION STATUS IN ACC
;
; EXECUTE THE COMMAND IN REGISTER R1
;
;
EXCMD: LIMI 3 ;DISABLE INTERRUPTS EXCEPT TMS9902 AND DISK
LI PORT,CMDREG
SWPB R1
LDCR R1,BYTEWIDE ;OUTPUT CONTROLLER COMMAND
; LIMI 3 ;ENABLE FDC INTERRUPTS ONLY
LI R0, 40 ;DELAY AROUND 60uS BEFORE READING STATUS
EXCMD1: DEC R0
JNE EXCMD1
CI R1,FINTCMD*256 ;IF FORCE INTERRUPT EXIT
JEQ EXCMD3
; CI R1,RDCMD*256
; JNE EXT
;
;--WHEN THE FDC COMPLETION INTERRUPT ROUTINE IS ENTERED THIS TEMPORARY
; HALT INSTRUCTION WILL BE BYPASSED
;
SETO @OPCOMP
EXCMD4A MOV @OPCOMP, R1 ;TIMEOUT WILL ALSO CLEAR THIS
JNE EXCMD4A ;USE FDCINT TO BUMP PAST THIS ADDRESS
MOV @FDCSTATUS,R1 ;STATUS REGISTER RESULT