.PAGE
;---
; ZERO PAGE MAPPING
;
; The following equates are for dividing RAM into logical areas;
; however, as the code grew, this convention was not strictly adhered
; to and therefore one will find both "LOCAL" and "GLOBAL" variables
; scattered throughout the RAM area
;+++
IOB .Equ 00 ; INPUT OUTPUT BLOCK
This starts at $FCC000. All ofsets from here are WORD offsets!!!. For example, COMMAND is
at FCC002 (offset of one word). Actually, only the low byte of the word has any
significance.
SHARERAM .Equ 10 ; READ/WRITE SHARED RAM, INITIALIZED BY 6504 ON BOOT
Starts at $FCC020
STATUS .Equ 20 ; READ ONLY STATUS FROM THE 6504
$FCC040
IIOB .Equ 30 ; INTERNAL IOB
$FCC060 This can be used to check the last command excuted
GLOBALS .Equ 40 ; 6504 INTERNAL GLOBALS
$FCC080 This is where the actual "ROM" is maintained. Of course these can be changed, but
don't even think about it
LOCALS .Equ 68 ; LOCAL VARIABLES
$FCC0D0 Local storage mainly. Probably should not be changed
;; THESE APPEAR, FROM THE LISTING PROVIDED, TO BE HEX NUMBERS UNLESS FOLLOWED BY A DECIMAL
;; 1/6/89 ARS
.PAGE
;---
;
; IOB
;
; THE IOB IS ALWAYS COPIED INTO THE INTERNAL IOB (IIOB) AREA BEFORE USAGE
; SO THAT THE 68K CAN START TO BUILD A NEW COMMAND INTO THE IOB AS SOON AS
; POSSIBLE. ALL REFERENMCES TO THE IOB OF IIOB ARE DONE IN THE FOLLOWING
; FORMAT:
; IOB IIOB
; -------- --------
; GOBYTE IOB+GOBYTE IIOB+GOBYTE
; DRIVE IOB+DRIVE IIOB+DRIVE
;
;+++
IOBSIZE .Equ 07 ; SIZE OF IOB BLOCK USED FOR PARAMETER PASSING
GOBYTE .Equ 00 ; COMMAND BYTE FROM 68K
$FCC000/060
; 00 COMMAND ACCEPTED BY THE 6504, 68K MAY ISSUE A NEW COMMAND
; 80-89 COMMAND FROM 68K TO 6504
; 80 NULL, TESTS HANDSHAKE
; 81 RWTS COMMAND, COMMAND CODE IN 'COMMAND'
; 83 SEEK
; 84 CALL ADDRESS IN 6504
; 85 CLEAR STATUS
; 86 SET MASK
; 87 CLEAR MASK
; 88 WAIT IN ROM
; 89 Go jump to self forever (Their case change ARS)
;
; 01-7F,82,90-FF *** RESERVED ***
COMMAND .Equ 01 ; RWTS COMMAND CODE
$FCC002/062
; 00 READ Read Read the Data @ Drive/Side/Track/Sector
; 01 WRITE Write Read the Data @ Drive/Side/Track/Sector
; 02 UNCLAMP Unclamp the disk in Drive
; 03 FORMAT Format the disk in Drive
; 04 VERIFY Verify the disk in Drive
; 05 FORMAT TRACK Format single Track on the disk in Drive
; 06 VERIFY TRACK Verify single Track on the disk in Drive
; 07 READBF Read w/o checksum verification
; 08 WRITEBF Write w/o checksum creation
; 09 CLAMP Clamp the disk in Drive
; 0A-FF *** RESERVED ***
MASK .Equ COMMAND ; MASK FOR SETTING AND RESETTING IMSK & IST
$FCC002/062
; 08 SET OR CLEAR INTERRUPT MASK FOR UPPER DRIVE
; 80 SET OR CLEAR INTERRUPT MASK FOR LOWER DRIVE
; 01 CLEAR DISK INSERTED INTERRUPT FOR UPPER DRIVE
; 10 CLEAR DISK INSERTED INTERRUPT FOR LOWER DRIVE
; 02 CLEAR BUTTOM PRESSED INTERRUPT FOR UPPER DRIVE
; 20 CLEAR BUTTOM PRESSED INTERRUPT FOR LOWER DRIVE
; 04 CLEAR R/W COMMAND COMPLETED INTERRUPT FOR UPPER DRIVE
; 40 CLEAR R/W COMMAND COMPLETED INTERRUPT FOR LOWER DRIVE
ADRL .Equ COMMAND ; LOW BYTE OF ADDRESS FOR 6504 CALL
$FCC002/062
ADRH .Equ ADRL+1 ; HIGH BYTE OF ADDRESS FOR 6504 CALL
$FCC004/064
; A call to "1FFB" will reset the 65404
DRIVE .Equ 02 ; DRIVE NUMBER
$FCC004/064
; 00 DRIVE 0 UPPER DRIVE
; 80 DRIVE 80 LOWER DRIVE
SIDE .Equ 03 ; SIDE NUMBER
$FCC006/066
; 00 SIDE 0 UPPER SIDE OF MEDIA
; 01 SIDE 1 LOWER SIDE OF MEDIA
SECTOR .Equ 04 ; SECTOR NUMBER
$FCC008/068
; 00-15 MAXIMUM DEPENDES ON TRACK NUMBER
TRACK .Equ 05 ; TRACK NUMBER
$FCC00A/06A
; 00-2D 46 TRACKS TOTAL (twiggy, Sony has 80 -- 0-79)
SPEED .Equ 06 ; SPEED OVERRIDE
$FCC00C/06C
; 00 NOOVERRIDE, SPEED IN DEPENDING ON TRACK NUMBER
; 01-FF Modifier value added to nominal speed
FMTCNFN .Equ 07 ; Format configuration byte
$FCC00E/06E ; Used to ensure format is not executed by mistake
; FF FMTCNFM must be = FF for foramt/format track to work
ERRSTAT .Equ 08 ; ERROR STATUS, RETURNED AFTER R/W COMMANDS
$FCC010/070 ; See constants for current error code values
This also seems to be used for address mark storage?
DISKID .Equ 09 ; Current id of the disk last accessed
$FCC012/072
; 00 UIniFile/DuoFile disk
; 01 Lisa disk
; 02 Macintosh disk
NoSides .Equ 0A ; Number of sides of disk drive mechanism
$FCC014/074
DrvError .Equ 0B ; Hard errors get returned throught his byte
$FCC016/076
HostSeek .Equ 0C ; When moving the head this location = 'FF'
$FCC018/078
SeekErr .Equ 0D ; When seek does not handshake then = '0F'
$FCC01A/07a
.Page
;--
; Shared RAM
;
; SHARED RAM COMES IN TWO FLAVOERS: 'READ/WRITE' AND 'READ ONLY'. THE 68K CAN,
; OF COURSE, READ AND WRITE TO ANY BYTE IN THE RAM AT ANY TIME BUT THIS IS NOT
; VERY WISE, (ONE MIGHT SAY VERY FOOLISH...), SO THE BY 'READ ONLY' WE MEAN
; MEMORY THAT NEVER SHOULD BE WRITTEN TO BY THE 68K BUT IS VALID TO READ AT
; ANY TIME. TYPICAL 'READ ONY' VARIABLES ARE THE STATUS FLAGS CLMED0 AND
; CLMPED80 THAT TELLS THE 68K THAT A DISK IS CLAMPED IN DRIVE 0 OR 80
;
; 'READ/WRITE' SHARED MEMORY IS, FOR EXAMPLE, THE IOB BUT IN THIS CASE IT IS
; A FAMILY OF 'CONSTANTS' SET UP ON COLD START BY THE 6504 TO THEIR DEFAULT
; VALUES, BUT THEY CAN BE CHANGED AT ANY TIME BY THE 68K TO ANY VALUE. THERE
; IS NO CHECKING OF THE RANGE OF THESE VALUES O THE NEW ONE BETTER MAKE SENSE
; OR THE 6504 MIGHT GO OF TO NEVER, NEVER LAND...
;
; SHARED: READ/WRITE
;++
MSpdTbl .Equ ShareRam
$FCC020
SCDLY .Equ SHARERAM+5. ; Speed change delay in 5 ms intervals
$FCC02A
HEADELAY .Equ SHARERAM+6. ; Head settling time in 5 ms intervals
$FCC02C
MAXDDLY .Equ SHARERAM+7. ; Timer value in 2/3 second before motor off
$FCC02E
ROMIDNUM .Equ SHARERAM+8. ; ROM identification number ( 0018/FCC031 )
$FCC030
MAXRETRY .Equ SHARERAM+9. ; Maximum number of retries during a read/rwite
$FCC032
MAXRECAL .Equ SHARERAM+10. ; Maximum number of recalibrations during a r/w
$FCC034
StpDly .Equ SHARERAM+11. ; Step dely time in 100 usec intervals
$FCC036
MONDLY .Equ SHARERAM+12. ; Motor on delay time in 5 ms intervals
$FCC038
.Page
;++
; SHARED: READ ONLY
;--
Clamped .Equ Status ; Disk in Place (=0 EMPYT, =FF CLAMPED)
$FCC040
MtrOn .Equ Clamped+1 ; DRIVE MOTOR SELECT (0=OFF, FF=ON)
$FCC042
CurTrack .Equ Status+2 ; value of current track
$FCC044
CurClass .Equ CurTrack+1 ; Current track class (0: 4)
$FCC046
DrvConn .Equ Status+4 ; Will be 'FF' if a drive is physically there
$FCC048
FmtType .Equ DrvConn+1 ; '2' for single, '22' for double sided mechanism connected
$FCC04A
RetryCnt .Equ Status+6 ; RETRY COUNT
$FCC04C
RecalCnt .Equ RetryCnt+1 ; RECALIBRATION COUNT
$FCC04E
ImAlive .Equ Status+8 ; THIS VARIABLE SPINNS AS LONG AS THE MAIN LOOP IS EXECUTING
$FCC050
Counter .Equ Status+9. ; GENERAL COUNTER
$FCC052
HoldInx .Equ Counter+1 ; Holds command index temporarily
$FCC054
FmtGap .Equ Counter+2 ; Amt * 5 of 20 usec 'FF's to write as selfsync
$FCC056
Imsk .Equ Status+12. ; Bits 7 & 3 are mask; if set the drive enabled
$FCC058
DipIntr .Equ Imsk+1 ; Flag reflects DIP interrupt
$FCC05A
OkToGo .Equ Imsk+2 ; REFLECTS FDIR (=0, FDIRL; <>0, FDIRH)
$FCC05C
IST .Equ Imsk+3 ; INTERRUPT STATUS
$FCC05E
; Bits of IST are numbered for LSb (0) to MSb (7)
;
; Bit Meaning
; --- -------
; 0 Drive 0 disk inserted
; 1 Drive 0 button pressed
; 2 Drive 0 R/W completed
; 3 Logical OR of bit 0,1 & 2
; 4 Drive 80 disk inserted
; 5 Drive 80 button pressed
; 6 Drive 80 R/W completed
; 7 Logical OR of bit 4,5 & 6
AdrMk1 .Equ IIob+8 ; 5 values that indicate start and end of address field
$FCC050
AdrMk2 .Equ AdrMk1+1 These seem to be overlapping w/ some of the good stuff in
$FCC052 the main IIob? Maybe the two purposes are mutualy exclusive.
AdrMk3 .Equ AdrMk1+2
$FCC054
AdrMk4 .Equ AdrMk1+3
$FCC056
AdrMk5 .Equ AdrMk1+4
$FCC058
.Page
; Following 3 byte counter controls both testing
; for DIP and shutting off teh motors. When
WtLow .Equ Globals ; the low 2 bytes = 0 then test for DIP. When
WtMid .Equ WtLow+1 ; the third byte becomes 0 the heads are parked
WtHih .Equ WTLow+2 ; and the motors are turned off
$FCC080/082/084
; For timing and space purposes during writing
; of data, an indexed by "y" through zero
INXPTRL .Equ Globals+3 ; pge instruction is used. The two bytes
INXPTRH .Equ INXPTRL+1 ; hold the base address for the index.
$FCC086/088
; Some constants for timing purposes
K000 .Equ Globals+5 ; A constant '00'
K0FF .Equ K000+1 ; A constant 'FF'
$FCC08A/08C
; Following 8 locations hold error counters for
; various read errors. The first three are for
; error w/ reading data and the last five are
; for errors associated w/ the header.
STSLP .Equ GLOBALS+8. ; Read Data Starting Bitslip
$FCC090
BSCNT .Equ StSlp+1 ; Read Data ending Bitslip
$FCC092
CSERROR .Equ StSlp+2 ; Read data Checksum error
$FCC094
RASTRT .Equ StSlp+3 ; Read Address Starting Bitslip
$FCC096
RAEND .Equ StSlp+4 ; Read Address Ending Bitslip
$FCC098
RASCTR .Equ StSlp+5 ; Read Address wrong sector
$FCC09A
RATRK .Equ StSlp+6 ; Read Address wrong track
$FCC09C
RACSUM .Equ StSlp+7 ; Read Address Checksum error
$FCC09E
ERRLEN .Equ 7 ; 8 bytes, zero based
CSMFND .Equ Globals+16. ; CHECKSUM read from disk
$FCC0A0
VOLFND .Equ CsmFnd+1 ; 0 = UniFile/DuoFile, 1 = Lisa, 2 = Mac
$FCC0A2
SDFND .Equ CsmFnd+2 ; SIDE FOUND
$FCC0A4
SECFND .Equ CsmFnd+3 ; SECTOR FOUND
$FCC0A6
TRKFND .Equ CsmFnd+4 ; TRACK FOUND
$FCC0A8
CSUM .Equ CsmFnd+5 ; Checksum calculated from ADDRESS data
$FCC0AA
ADRSLEN .Equ 4 ; LENGTH OF ADDRESS HEADER - 1
TrkFlg .Equ Globals+22.
$FCC0AC
MtrFlg .Equ TrkFlg+1
$FCC0AE
StpAmt .Equ TrkFlg+2
$FCC0B0
Direct .Equ TrkFlg+3
$FCC0B2
IndexL .Equ Globals+26.
$FCC0B4
IndexH .Equ IndexL+1
$FCC0B6
RangeL .Equ IndexL+2
$FCC0B8
RangeH .Equ IndexL+3
$FCC0BA
CPBY01 .Equ Globals+30. ; Composite byte formed from BUFFER[ 2FF:301 ]
$FCC0BC
CPBY02 .EQY CPBY01+1 ; [ 3FE:3FF ]
$FCC0BE
CPCKSUM .Equ Globals+32. ; Composite byte formed from 3 checksum bytes
$FCC0C0
CKSUM1 .Equ CPCKSUM+1 ; First checksum byte
$FCC0C2
CKSUM2 .Equ CPCKSUM+2 ; Second shecksum byte
$FCC0C4
CKSUM3 .Equ CPCKSUM+3 ; Third checksum byte
$FCC0C6
TCKSM1 .Equ Globals+36. ; During a read of data, the checksum is read
$FCC0C8
TCKSM2 .Equ TCKSM1+1 ; into "CKSM1..3". A new checksum is created
$FCC0CA
TCKSM3 .Equ TCKSM1+2 ; and stored in these 3 bytes to verify matters
$FCC0CC
TEMPSEC .Equ Globals+39. ; TEMPRARY SECTOR COUNTER USED BY FORMAT
$FCC0CE
.Page
;--
; LOCAL VARIABLES USED IN ONE OR SEVERAL ROUTINES
;++
RWCSMFLG .Equ LOCALS ; Flag fro usage of host supplied checksum
DELAY .Equ LOCALS+1 ; COMPUTED DELAY FOR TOTAL SEEK
Sv1 .Equ LOCALS+2 ; storage during Write16
Sv2 .Equ Sv1+1
Sv3 .Equ Sv1+2
Sv4 .Equ Sv1+3
TEMP1 .Equ Locals+6. ; 2 Locations for temporary by many routines
TEMP2 .Equ TEMP1+1
DatMk1 .Equ Locals+8 ; 5 values that indicate start and end of Data field
DatMk2 .Equ DatMk1+1
DatMk3 .Equ DatMk1+2
DatMk4 .Equ DatMk1+3
DatMk5 .Equ DatMk1+4
LOWCNT .Equ LOCALS+13. ; Holds value for physiacl interleave count
HIHCNT .Equ LOWCNT+1. ; Same but opposite/complimentary value
CNTPTR .Equ LOWCNT+2. ; Pointer to which cnt to use ( high or low )
TOTCNT .Equ LOWCNT+3. ; Total count of sectors written
TEMP3 .Equ Locals+17.
TEMP4 .Equ TEMP3+1
RtyFlg .Equ Locals+19. ; flag for use in BadAddr error handling
Uu6 .Equ Locals+20. ; 2 unused locations
Cmdx .Equ Locals+21.
SaveL .Equ Locals+22.
SaveH .Equ Locals+23.
CmdLeng .Equ 3F ; 64 byte ring buffer of 8 byte IOB's
SavIndex .Equ 80
; *** NOTE -- Ram from 'C0' to 'FF' is used by the 68K as parameter memory ***
LSTUSED .Equ 0BF ; last used location in the ZERO PARE RAM
.Page
;--
;
; CONSTANTS
;
;++
BUFR12SZ .Equ 0B ; LENGTH OF 12 BYTE BLOCK HEADER - 1
NIBLRETR .Equ 20 ; THE NUMBER OF NIBBLES READ SEARCHING FOR THE
; FIRST ADDRESS MARK DURING A READ
MAXTRACK .Equ 4F ; MAXIMUM TRACK NUMBER: 79.
MINTRACK .Equ 0 ; MIMIMUM TRACK NUMBER: 0
MAXCLASS .Equ 04 ; Maximum track class value -- range from 0..4
MINSECNT .Equ 08 ; Minimum sector count
MAXSECNT .Equ 0C ; Maximum sector count
MINSPEED .Equ 0D4 ; Minimum speed value
MAXSPEED .Equ 038 ; Maximum speed value -- Low # = high speed
OkDly .Equ 28.
CNFMVAL .Equ 0FF ; Format configuration check byte
LOW6 .Equ 3F ; mask for low 6 bit
MaxCmd .Equ 09 ; 10 commands return FDirH ( -1 )
CmdNumb .Equ 07 ; Seven commands nao accessed through '81'
NullCmd .Equ 080 ; Null/Handshake command
RwtsCmd .Equ 091 ; Read/Write Track/Sector command value
LwCmdNo .Equ 083 ; Lowest command number ( not including '81' )
ClStsCmd .Equ 085 ; Command to clear interrupt status
WrtCmd .Equ 01 ; Value of command to write data to disk
WrtBfCmd .Equ 08 ; Write data, brute force method
FrmtDsk .Equ 03 ; Value of command host to to format disk
VrfyDsk .Equ 04 ; Value of command host to to verify disk
FrmtTrk .Equ 05 ; Value of command from host to format a track
VrfyTrk .Equ 06 ; Value opf command from host to verify a track
ADM1 .Equ 0D5 ; Address mark one
ADM2 .Equ 0AA ; Address mark two
ADM3 .Equ 096 ; Address mark three
DDM3 .Equ 0AD ; Data mark three
BitSlp1 .Equ 0DE ; Bit slip mark one
BitSlp2 .Equ 0AA ; Bit slip mark two
RclStep .Equ 4. ; # of steps to take away from Trk00 during recal
OneScc .Equ 200. ; constant for a one second wait
TmOutRcl .Equ 100. ; Timeout for recal wait
RdAdrTmt .Equ 08. ; Tiomeout for looking for address header
IWMMode .Equ 01F ; constant to setup IWM modes
TurnRound .Equ 08. ; 5*8=40 msec turn around time for changing directions
Lrge .Equ 05.
Smal .Equ 01.
TblJmp .Equ 09.
WHih .Equ 17. ; '11' hex
WLow .Equ 00.
tLow .Equ 20.
; ERROR NUMBERS
GErrCmd .Equ 01 ; Gobyte error: Invalid command
GErrDrv .Equ 02 ; Gobyte error: Invalid drive number
GErrSid .Equ 03 ; GoByte error: Invalid side number
GErrSec .Equ 04 ; Gobyte error: Invalid Sector number
GErrTrk .Equ 05 ; Gobyte error: Invalid Track number
GErrMsk .Equ 06 ; Gobyte error: Invalid mask
GErrClm .Equ 07 ; Gobyte error: No clamped disk in drive
GErrEna .Equ 08 ; Gobyte error: Drive not enabled
GErrIntr .Equ 09 ; Gobyte error: Pending interrupts not cleared
GErrFmPr .Equ 10. ; Gobyte error: Invalid format parameter
PErrROM .Equ 11. ; Program error: ROM test failed
PErrInt .Equ 12. ; Program error: Random IRQ, NMI or BRK
DErrCal .Equ 13. ; Drive error: time out while looking for track zero
IWMError .Equ 14. ; Fatal error: IWM doesn't respond to commands
StepErr .Equ 15. ; Handshake diod not occur when stepping
DErrTk0 .Equ 16. ; Drive Error: Unable to leave track zero location
SErrProt .Equ 20. ; Errstat error: Write protect error
SErrFrmt .Equ 21. ; Errstat error: Can't verify disk
SErrClmp .Equ 22. ; Errstat error: Unable to clamp disk
SErrRd .Equ 23. ; Errstat error: Read error
SErrWr .Equ 24. ; Errstat error: Write error
SErrUclmp .Equ 25. ; Errstat error: Unable to unclamp diskette
SErrNoA9 .Equ 26. ; Errstat error: Cannot find A9's during chkspd
SErrTmt .Equ 27. ; Errstat error: Unable to adjust speed w/in timeout
SErrM1Tk .Equ 28. ; Errstat error: Cannot write speed track
ErrHdr .Equ 30. ; UnderRun while writing header
ErrWrt .Equ 31. ; UnderRun while writing data fields
.Page
;++
;
; Data Buffer equates and Bad Block equates
;
;--
StackSt .Equ 0CF ; Init stack to "01CF" -- push down stack
SctrCnt .Equ 01D0 ; During VERIFY, will no. of bad sectors
TrkNumb .Equ SctrCnt+1 ; Track number where bad sector occurred
SidNumb .Equ SctrCnt+2 ; Side number where bad sector occurred
SctrSav .Equ SctrCnt+3 ; Start of buffer where sector numbers are saved
Page01 .Equ 100 ; last 12 bytes of data are for read/write
Bufr12 .Equ 1F4 ; last 12 bytes of data for raed/write
Page02 .Equ 200 ; 256 bytes of data for read/write
Page03 .Equ 300 ; "
Pg2Len .Equ 0FF ; # of bytes to read during Wrbf02 loop
Pg3Len .Equ 0FE ; # of bytes to read during Wrbf03 loop
.Page
;--
; I/O Space
;++
IOSpace .Equ 800 ; name for beginning of I/O space offsets
Off .Equ 00 ; Offset to switch a phase off
On .Equ 01 ; Offset to switch a phase on
Zero .Equ 00 ; Offset to drive zero
Eighty .Equ 01 ; Offset to drive eighty
Low .Equ 00 ; PwmEna + Low enables output of PWMReg
High .Equ 01
InWard .Equ 00 ; direction offsets
OutWard .Equ 01
CA0 .Equ IOSpace ; Control signal 0 for MCI PAL in Sony drive
CA1 .Equ IOSpace+2 ; signal 1
CA2 .Equ IOSpace+4 ; signal 2
LStrb .Equ IOSpace+6 ; Load strobe -- 0 to 1 to 0 will strobe PAL
MtEna .Equ IOSpace+8 ; Enables output of DrvEna
DrEna .Equ IOSpace+10. ; = 0 --> drive 0, = 1 ==> drive 80
Q6L .Equ IOSpace+12. ; Low = Read or Write
Q6H .Equ Q6L+1 ; High = Sense or Write Load
Q7L .Equ IOSpace+14. ; Low disables writing to disk
Q7H .Equ Q7L+1 ; Enables /WrReq output of IWM
CntEna .Equ IOSpace+16. ; low enables PWM counter/comparator
PwmEna .Equ IOSpace+22. ; High enables pulses to Sony, else always low
DisL .Equ IOSpace+24. ; Memory enable for the 68K
DisH .Equ DisL+1 ; Memory disable for the 68K
Side0Sel .Equ IOSpace+26. ; Selects side 0
Side1Sel .Equ Side0Sel+1 ; Selects side 1
BootL .Equ IOSpace+28. ; Disk Diag Line; when High then I'm listening
BootH .Equ BootL+1
FDirL .Equ IOSpace+30. ; Deselects the interrupts to the 68K
FDirH .Equ FDirL+1 ; Selects the interrupts to the 68K
PWMReg .Equ IOSpace+32. ; Selects the PWM register for writing
;
