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dosdefs.asm
executable file
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dosdefs.asm
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;
; DragonDos, Copyright (C) 1983,1984 Dragon Data Ltd.
;
; Disassembled 2004-11-05, P.Harvey-Smith.
;
; 2005-10-10, forked ram vars into seperate include file.
;
TrackPrecomp EQU $10 ; Track to enable precomp if greater
SectorsPerTrack EQU $12 ; Sectors per track
FmtDefTracks EQU $28 ; Default tracks for format
FmtDefTracksA EQU $50 ; Dragon Alpha default tracks for format
FmtDefSides EQU $01
MaxDriveNo EQU $04 ; Maximum valid drive no
MaxFilenameLen EQU $0E ; Max filename length, DriveNo:Filename.EXT
MaxTrack EQU $4F ; Maximum track no (80)
;
; Boot command related.
;
BootFirstSector EQU $03 ; Boot sector is track 0 sector 3
BootLastSector EQU $12 ; Last sector of boot
BootSignature EQU $4F53 ; Boot signature 'OS'
BootLoadAddr EQU $2600 ; Boot area load address.
BootEntryAddr EQU $2602 ; Boot entry address
;
; Dir track related
;
DirPrimary EQU $14 ; Primary dir track is track 20
DirBackup EQU $10 ; Backup on track 16
;
; DOS Low memory variables
;
AutoFlag EQU $FF ; Auto re-number flag, if $613=this then auto enter basic lines
DosCommand EQU $00EA ; Dos function no to execute
DosDriveNo EQU $00EB ; Last active drive number
DskTrackNo EQU $00EC ; Disk track no
DskSectorNo EQU $00ED ; Disk sectror no
DiskBuffPtr EQU $00EE ; Disk buffer pointer
DosDiskError EQU $00F0 ; Disk error status byte
DosCurrCtrlBlk EQU $00F1 ; Current file control block (FIB) (0..9) $FF=no files open
DosBytesInDTA EQU $00F2 ; Number of bytes in DTA (also used for tracks in DSKINIT).
DosDSKINITraks EQU $00F2
DosNoBytesMove EQU $00F3 ; Number of bytes to transfer to/from buffer, also head during format
DosDSKINIHead EQU $00F3
DosRecLenFlag EQU $00F4 ; Record length flag, 00 don'r care $FF=do care, also DS flag in format
DosRWFlag EQU $00F5 ; Read write flag, $00=read, $01= write, $FF=verifying
DosIOInProgress EQU $00f6 ; I/O currently in progress flag 0x00 check for time out, Non-0x00 skip timeout check
DosMakeSysDsk EQU $00f7 ; Make system disk during format, $00=no, $FF=yes
DosSectorSeek EQU $00F8 ; Sector currently seeking {SuperDos Rom}
*************************************************************************
DosAreaStart EQU $0600 ; Start of RAM used by DOS
Thrash EQU $0600 ; Work byte, yes that's what it's called in the DD sourcecode!
Temps1 EQU $0601 ; Temp storage for registers #1
Temps2 EQU $0602 ; Temp storage for registers #2
TempC EQU $0603 ; Temp for FREAD
TempL EQU $0604 ; Temp for FREAD
DosErrorCode EQU $0603 ; Error code from DOS
DosTimeout EQU $0605 ; Timeout count, Motor timer
; timeout occurs when this location is decremented from 0x01 to 0x00,
DosHWMaskFF40 EQU $0606 ; Hardware command byte mask for FF40 (disk option)
DosHWMaskFF48 EQU $0607 ; hardware control mask for $ff48 (latch temp)
DosVerifyFlag EQU $0608 ; Verify flag, 00=no verify $FF=verify
DosErrorMask EQU $0609 ; Error mask, ANDed with error code from WD
DosDefDriveNo EQU $060A ; Default drive number
DosFWriteBPtr EQU $060B ; FWrite buffer pointer
DosBuffStart EQU $060D ; Buffer start
DosBuffEnd EQU $060F ; Buffer end
DosRunLoadFlag EQU $0611 ; Run/load flag $00=LOAD
DosFlFreadFlag EQU $0612 ; Fread/FLread flag 00=fread, $FF=FLread
*************************************************************************
; Auto flags share their locations with FWrite buffers as they cannot both be
; active together
DosAutoFlag EQU $0613 ; Auto flag, $FF=auto, $00=no auto
DosAutoCurrent EQU DosBuffStart ; AUTO current line no
DosAutoInc EQU DosBuffEnd ; AUTO line increment
*************************************************************************
; variables for ON ERROR
DosErrGotoFlag EQU $0614 ; ERROR GOTO flag, 0x00 Off Non-0x00 On
DosErrDestLine EQU $0615 ; Error destination line
DosErrLineNo EQU $0617 ; line no error occured in (ERR line no)
DosErrLast EQU $0619 ; Error that occured
DosErrPtr EQU $061A ; pointer to the statement that caused the error
*************************************************************************
Drv0Details EQU $061C ; Drive 0 details (6 bytes)
Drv1Details EQU $0622 ; Drive 1 details (6 bytes)
Drv2Details EQU $0628 ; Drive 2 details (6 bytes)
Drv3Details EQU $062E ; Drive 3 details (6 bytes)
DrvDeatailLen EQU $06 ; Entries are 6 bytes long
; Offsets into drive details
DrvDetDirLSN EQU $00 ; LSN of directory
DrvDetFreeLen EQU $02 ; Free length
DrvDetFreeEPtr EQU $03 ; Free extent pointer (LSN)
DrvDetUseCnt EQU $05 ; Usage/open file count ?
*************************************************************************
BuffCount EQU $04 ; 4 disk buffers
BuffDetailSize EQU $07 ; Buffer detail entries ar 7 bytes long
Buff1Details EQU $0634 ; Disk buffer 1 details
Buff2Details EQU $063B ; Disk buffer 2 details
Buff3Details EQU $0642 ; Disk buffer 3 details
Buff4Details EQU $0649 ; Disk buffer 4 details
; Disk buffer details offsets for above table
BuffLSN EQU $00 ; LSN number
BuffFlag EQU $02 ; Flag, see below...
BuffDrive EQU $03 ; Drive no 1..4
BuffAge EQU $04 ; Age of buffer since last use, 1=oldest..4=youngest
BuffAddr EQU $05 ; Buffer address
;BuffFlag values
BuffFree EQU $00 ; Disk buffer is free
BuffUnknown EQU $01 ; Valid, clean
BuffInUse EQU $55 ; Buffer in use** not documented in DDv2c source.
BuffDirtyExpire EQU $FE ; Buffer has been modified, but not written to disk, grace period expired
BuffDirty EQU $FF ; Buffer has been modified, but not written to disk
*************************************************************************
DosCurDriveInfo EQU $0650 ; Dos current drive info
DosCurFilename EQU $0650 ; Current filename
DosCurExtension EQU $0658 ; Current extension, used in validation
DosCurDriveNo EQU $065B ; Current drive no
DosLSNCounter EQU $065C ; LSN counter in directory search
DosSaveBuffAddr EQU $065E ; Save buffer address
DosCurCount EQU $0660 ; Current count, used in various places (extent found?)
; marked as "Temp1, extent found" in DDv2c source
DosBytesRead EQU $0661 ; Number of bytes to read in DosFRead
DosSecOffset EQU $0663 ; Offset within sector for DosFRead to start
DosFWriteAddr EQU $0664 ; Fwrite address
DosPageBufAddr EQU $0667 ; Page buffer address
DosCurrSector EQU $0669 ; Current sector (LSN?)
DosTotalSFound EQU $066B ; Total sectors found
DosFSNToFind EQU $066D ; FSN sought
DosCurLSN EQU $066F ; Current LSN, of current DIR sector being processed
DosFWBufPtr EQU $0671 ; Pointer to buffer in FWrite
DosFWByteCount EQU $0673 ; Number of bytes to write in FWrite
DosFWFPoint EQU $0675 ; File pointer to write at in FWrite
DosSaveFCB EQU $0678 ; Temparary FCB pointer used by DosCreateFile.
DosSaveExt EQU $067A ; Temporary extension used during DosCreateFile
DosTempFCBNo EQU $067D ; Temporary Fileno / FCB no storage used by DosCreateFile.
DosCurDirBuff EQU $067F ; Pointer to the current Dir sector, Buffer def block
DosTempFileNo EQU $0681 ; Temp file no whilst opening file
DosCurFileNo EQU $0682 ; Current file number on disk, to get dir entry for
DosNewUSRTable EQU $0683 ; New USR table, relocated from low ram
;Drive parameter tables, note these need to be in this order.
DosD0Online EQU $0697 ; Drive 0 online flag
DosD1Online EQU $0698 ; Drive 1 online flag
DosD2Online EQU $0699 ; Drive 2 online flag
DosD3Online EQU $069A ; Drive 3 online flag
DosD0Track EQU $069B ; Drive 0 current track
DosD1Track EQU $069C ; Drive 1 current track
DosD2Track EQU $069D ; Drive 2 current track
DosD3Track EQU $069E ; Drive 3 current track
DosTemp2 EQU $067E ; Temp, used in FindEmptyDir, CmdFLRead....
DosLBASec EQU $069F ; as step rates meaningless for disk image
DosD0StepRate EQU $069F ; Drive 0 step rate
DosD1StepRate EQU $06A0 ; Drive 1 step rate
DosD2StepRate EQU $06A1 ; Drive 2 step rate
DosD3StepRate EQU $06A2 ; Drive 3 step rate
DosD0Tracks EQU $06A3 ; Tracks on disk in drive 0
DosD1Tracks EQU $06A4 ; Tracks on disk in drive 1
DosD2Tracks EQU $06A5 ; Tracks on disk in drive 2
DosD3Tracks EQU $06A6 ; Tracks on disk in drive 3
DosD0SecTrack EQU $06A7 ; Sectors per track drive 0
DosD1SecTrack EQU $06A8 ; Sectors per track drive 1
DosD2SecTrack EQU $06A9 ; Sectors per track drive 2
DosD3SecTrack EQU $06AA ; Sectors per track drive 3
; Offsets of tables from Online table, this way we can point an index register
; at the drive online byte and access the other tables with offset,IR
DosTrackTblOfs EQU (DosD0Track-DosD0Online)
DosStepTblOfs EQU (DosD0StepRate-DosD0Online)
DosTracksTblOfs EQU (DosD0Tracks-DosD0Online)
DosSecTrkTblOfs EQU (DosD0SecTrack-DosD0Online)
DosDirSecStatus EQU $06AB ; Directory sector status $06ab-$06bc
DosFCB0Addr EQU $06BD ; File Control Block 0 Address
DosFCB1Addr EQU $06DC ; File Control Block 1 Address
DosFCB2Addr EQU $06FB ; File Control Block 2 Address
DosFCB3Addr EQU $071A ; File Control Block 3 Address
DosFCB4Addr EQU $0739 ; File Control Block 4 Address
DosFCB5Addr EQU $0758 ; File Control Block 5 Address
DosFCB6Addr EQU $0777 ; File Control Block 6 Address
DosFCB7Addr EQU $0796 ; File Control Block 7 Address
DosFCB8Addr EQU $07B5 ; File Control Block 8 Address
DosFCB9Addr EQU $07D4 ; File Control Block 9 Address
DosFCBEnd EQU $07F3 ; First byte beyond last FCB
DosDiskBuffBase EQU $0800 ; Base of Disk buffers
DosFCBLength EQU $1F ; 31 bytes per FCB
DosNumFCBs EQU (DosFCBEnd-DosFCB0Addr)/DosFCBLength ; number of FCBs
;
; FCB structure is :
;
; FCB format :
; Pos Len Use
; $00 8 File name
; $08 3 Extension
; $0B 1 Drive no (1..4)
; $0C 3 Next read byte (file pointer?)
; $0F 1 Directory flags
; $10 3 Length of file
; $13 2 First sector number (FSN) of extent 1
; $15 2 LSN of extent 1
; $17 1 sextors in extent 1
; $18 2 First sector number (FSN) of extent 1
; $1A 2 LSN of extent 1
; $1C 1 sectors in extent 1
; $1D 1 Number of dir entry
; $1E 1 Directory number of last entry
FCBFileName EQU $00 ; Filename (zero padded)
FCBExtension EQU $08 ; Extension (zero padded)
FCBDrive EQU $0B ; Drive no
FCBFilePointer EQU $0C ; File Pointer
FCBDirFlags EQU $0F ; Dir flags (attributes)
FCBFileLen EQU $10 ; File Length
FCBFSNExtent1 EQU $13 ; FSN of extent 1
FCBLSNExtent1 EQU $15 ; LSN of extent 1
FCBSecExtent1 EQU $17 ; Sectors in extent 1
FCBFSNExtent2 EQU $18 ; FSN of extent 2
FCBLSNExtent2 EQU $1A ; LSN of extent 2
FCBSecExtent2 EQU $1C ; Sectors in extent 2
FCBDiskFileNo EQU $1D ; File number on disk, (dir entry no).
FCBDirNoLast EQU $1E ; Dir no of last entry
;
; Backup command stack frame offsets
;
; These are offset from U on stack
;
BupSrcDrive EQU 0 ; Drive number of source
BupSrcTrk EQU 1 ; Source track
BupSrcSec EQU 2 ; Source sector no
BupSrcMess EQU 3 ; Insert source message ptr
BupSrcBuff EQU 5 ; Source sector buffer addr
BupDestDrive EQU 7 ; Drive number of dest
BupDestTrk EQU 8 ; Dest track a
BupDestSec EQU 9 ; Dest sector no
BupDestMess EQU 10 ; Insert dest message ptr
BupDestBuff EQU 12 ; Dest sector buffer addr
BupSecTrk EQU 14 ; Sector count per track to copy
BupAvailPages EQU 15 ; Pages available to buffer sectors
;
; Offset from X, which will point to BupSrcDrive, or BupDestDrive
;
BupDrive EQU 0 ; Drive number
BupTrk EQU 1 ; track
BupSec EQU 2 ; sector
BupMess EQU 3 ; backup message
BupBuff EQU 5 ; Source sector buffer addr ?
BupStackFrame EQU 16 ; backup stack frame size
SpinUpDelay EQU $D800 ; Value for timeout loop
;
; Sync dir stack frame offsets
;
; These are offset from U on stack
;
SyncDriveCount EQU 0 ; drive counter, done by bitshift
SyncDrive EQU 1 ; Drive we are syncing
SyncBufferNo EQU 2 ; Current buffer no
SyncSecNo EQU 3 ; Sector we are syncing
SyncSectors EQU 4 ; 4 sector numbers in the disk buffers
;
; Dos function codes used by hardware routine.
;
DosFnRestore EQU $00 ; Restore to track 0
DosFnSeek EQU $01 ; Seek to a track
DosFnReadSec EQU $02 ; Read a sector
DosFnWriteSecV EQU $03 ; Write a sector with verify
DosFnWriteSecN EQU $04 ; Write a sector no verify
DosFnWriteTrack EQU $05 ; Write (format) track
DosFnReadAddr EQU $06 ; Read address mark
DosFnReadSec2 EQU $07 ; Read first two bytes of a sector
DosFnWriteDef EQU $08 ; Write defective sector
*******************************************
***** Directory Track realted defines *****
*******************************************
;
; Dir entry format(s).
;
; Dragon/Super dos directory entries can take one of 2 formats, they can be either a
; filename block, containing filename, attributes & 4 allocation entries, or they can
; be a continuation block, containing just allocation entries.
; This is controled by the byte at offset $18, and the attributes.
;
; if AttrContinued = 0 then
; the byte at offset $18, contains the number of number of bytes in the last sector (256 bytes = 0).
;
; if AttrContinued = 1 then
; the byte at offset $18 controls the format of the entry :
; if 0 then
; Entry is a filename entry
; else
; Entry is a continuation block.
; Filename block format
DirEntAttr EQU $00 ; Attributes (see below)
DirEntFilename EQU $01 ; Filename, zero padded
DirEntExtension EQU $09 ; Extension, zero padded
DirEntFnBlock1 EQU $0C ; Allocation block #1
DirEntFnBlock2 EQU $0F ; Allocation block #2
DirEntFnBlock3 EQU $12 ; Allocation block #3
DirEntFnBlock4 EQU $15 ; Allocation block #4
DirEntFlag EQU $18 ; Filename/Continuation flag 0/nonzero
DirEntLastBytes EQU $18 ; bytes in last sector
DirEntryLen EQU $19 ; Length of Dir Entry.
DirEntExts EQU 4 ; 4 allocatoion blocks in filename block
; Continuation block, DirEntAttr, and DirEntFlag, as above.
DirEntCntBlock1 EQU $01 ; Allocation block #1
DirEntCntBlock2 EQU $04 ; Allocation block #2
DirEntCntBlock3 EQU $07 ; Allocation block #3
DirEntCntBlock4 EQU $0A ; Allocation block #4
DirEntCntBlock5 EQU $0D ; Allocation block #5
DirEntCntBlock6 EQU $10 ; Allocation block #6
DirEntCntBlock7 EQU $13 ; Allocation block #7
DirEntCntExts EQU 7 ; 7 allocatoion blocks in continuation block
DirBlksPerSec EQU $0A ; Number of dir blocks per dir sector
;
; Allocation block format.
;
AllocLSN EQU $00 ; Logical sector number of start of allocation
AllocCount EQU $02 ; Count of number of sectors allocated.
AllocEntrySize EQU $03 ; Size of allocation entry
AllocLen EQU 3 ; Allocation length
;
; File Attributes
;
AttrDeleted EQU %10000000 ; Deleted, may be reused
AttrContinued EQU %00100000 ; Continuation entry, byte at $18 giver next entry no
AttrEndOfDir EQU %00001000 ; End of directory, no more entries need to be scanned
AttrWriteProt EQU %00000010 ; Write protect flag
AttrIsCont EQU %00000001 ; This is a continuation entry.
AttrAtFormat EQU AttrDeleted+AttrEndOfDir+AttrIsCont ; Attributes set in DSKINIT
AttrAfterDel EQU AttrDeleted+AttrIsCont ; Attributes set by DosDeleteFile
DirEntPerSec EQU $0A ; Directory entries per sector
DirLastByte EQU (DirEntPerSec*DirEntryLen) ; First byte beyond last dire entry in sector
;
; Offsets in Sector 0 on Dir track
;
BitmapPart1 EQU $00 ; Bitmap uses bytes $00..$FB on first sector
DirTracks EQU $FC ; Tracks on disk
DirSecPerTrk EQU $FD ; Sectors/track 18=Single sided, 36=Double sided
DirTracks1s EQU $FE ; complement of DirTracks (used to validate)
DirSecPerTrk1s EQU $FF ; Complement of DirSecPerTrk (used to validate)
;
; DOS Error codes.
;
ErrNR EQU $80 ; not ready
ErrSK EQU $82 ; seek
ErrWP EQU $84 ; write protect
ErrRT EQU $86 ; record type
ErrRF EQU $88 ; record not found
ErrCC EQU $8A ; CRC
ErrLD EQU $8C ; Lost data
ErrBT EQU $8E ; boot
ErrIV EQU $90 ; invalid volume / directory
ErrFD EQU $92 ; Full directory
ErrDF EQU $94 ; Disk full
ErrFS EQU $96 ; File spec
ErrPT EQU $98 ; Protection
ErrPE EQU $9A ; (read) Past end
ErrFF EQU $9C ; File not Found
ErrFE EQU $9E ; File exists
ErrNE EQU $A0 ; (file does) Not Exist
ErrTF EQU $A2 ; Too many Files open
ErrPR EQU $A4 ; Parameter
ErrUD EQU $A6 ; Undefined
ErrSFF EQU $FF ; ????
if 0
DDErrNR EQU $80 ; Not ready
DDErrSK EQU $82 ; seek
DDErrWP EQU $84 ; write protect
DDErrRT EQU $86 ; record type
DDErrRF EQU $88 ; record not found
DDErrCC EQU $8A ; CRC
DDErrLD EQU $8C ; Lost data
DDErrBT EQU $8E ; boot
DDErrIV EQU $90 ; invalid volume / directory
DDErrFD EQU $92 ; Full directory
DDErrDF EQU $94 ; Disk full
DDErrFS EQU $96 ; File spec
DDErrPT EQU $98 ; Protection
DDErrPE EQU $9A ; (read) Past end
DDErrFF EQU $9C ; File not Found
DDErrFE EQU $9E ; File exists
DDErrNE EQU $A0 ; (file does) Not Exist
DDErrTF EQU $A2 ; Too many Files open
DDErrPR EQU $A4 ; Parameter
DDErrUD EQU $A6 ; Undefined
DDErrSFF EQU $FF ; ????
endc
DDFirstError EQU ErrNR ; First error code
SecTrkSS EQU 18 ; 18 sectors / track single sided
SecTrkDS EQU 36 ; 36 sectors / track double sided
MaxLSN EQU (SecTrkDS*80) ; Maximum possible LSN
DskInitBuffer EQU $0800 ; Address of format disk buffer
SectorsPerBAM EQU $08 ; Each BAM entry is for 8 sectors
BAMEntries40SS EQU (SectorsPerTrack*40)/SectorsPerBAM ; Number of BAM entries for a single sided 40 track disk
BAMEntriesSec EQU (MaxLSN/2)/SectorsPerBAM ; Number of BAM entries per BAM sector
BAMLSNPerSec EQU MaxLSN/2 ; Number of LSNs per BAM sector
; Offsets within BAM of directory track flags
BAMOffDirPriSS EQU (SectorsPerTrack*DirPrimary)/SectorsPerBAM
BAMOffDirBakSS EQU (SectorsPerTrack*DirBackup)/SectorsPerBAM
BAMOffDirPriDS EQU (SectorsPerTrack*(DirPrimary*2))/SectorsPerBAM
BAMOffDirBakDS EQU (SectorsPerTrack*(DirBackup*2))/SectorsPerBAM
BAMSecCount EQU $02 ; No of BAM Sectors
DIRSecCount EQU $10 ; Dir sector count
DosFlagTrue EQU $FF ; flag true / enabled
DosFlagFalse EQU $00 ; flag false /disabled
IOInProgress EQU DosFlagTrue ; Flag that DOS IO in progress
ErrGotoEnabled EQU DosFlagTrue ; Flag that on error goto is enabled
AutoStartLine EQU 100 ; Default start line for AUTO
AutoIncrement EQU 10 ; Default increment for AUTO
; DosFRead code shared between file read wrie and verify
; DosRWFlag determines the operation to be performed
FileOpRead EQU $00 ; Reading file
FileOpWrite EQU $01 ; Writing file
FileOpVerify EQU $FF ; verifying written data
; Extend file stack fram offsets
ExtendSecCount EQU $00 ; Sector count
;ExtendDirEntPtr EQU $04 ; Pointer to dir entry with last sector
;ExtendGeomPtr EQU $08 ; Pointer to disk geometry buffer
ExtendSecCount2 EQU $0A ; Sector count
;
; Offsets within file header, compatible with DragonDos/SuperDos
;
HdrID55 EQU $00 ; magic marker byte #1
HdrType EQU $01 ; file type see filetypes below
HdrLoad EQU $02 ; Load address of file
HdrLen EQU $04 ; length of file
HdrExec EQU $06 ; entry address of file
HdrIDAA EQU $08 ; magic marker byte #2
FileHeadLen EQU $09 ; header length in bytes
; File types
FTypeBas EQU $01 ; Basic files
FTypeBin EQU $02 ; Binary file types
; Marker bytes
MarkerHeadStart EQU $55 ; start header marker
MarkerHeadEnd EQU $AA ; end header marker
; Device number
DevDisk EQU $01 ; disk device