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nasdefs.asm
executable file
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nasdefs.asm
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; NAS-SYS 3 routines, rst 18h followed by the appropreate byte
MRET: equ 05bh ; End program and return to NAS-SYS
SCALJ: equ 05ch ; Exec another routine who's number is at 0C0Ah
TDEL: equ 05dh ; time delay (1s at 4MHz), on exit A=0, B=0
FFLP: equ 05eh ; flip 1 or more bits on port 0 then back again, A=bits
MFLP: equ 05fh ; flip tape led on or off
ARGS: equ 060h ; collect args from command line HL=arg1, DE=arg2, BC=arg3
NASIN: equ 062h ; scan for input, if so CF=1, and A=char, does not wait
INLIN: equ 063h ; obtain a line of input, DE=addreess.
NUM: equ 064h ; Examine a line and convert to HEX
TBCD3: equ 066h ; Output HL as hex C=C+H+L
TBCD2: equ 067h ; Output A as hex C=C+A
B2HEX: equ 068h ; Output A as hex
SPACE: equ 069h ; Output a space, a set to space.
CRLF: equ 06ah ; Output CR, LF A=CR
ERRM: equ 06bh ; Error message output "Error"+CR, A=CR
TX1: equ 06ch ; Output HL & DE as hex C=C+H+L+D+E
SSOUT: equ 06dh ; Output string to serial port HL=ptr, B=len
SRLX: equ 06fh ; Output A to the serial port
RLIN: equ 079h ; Eamine input line at DE & convert to bin in ARGs
B1HEX: equ 07ah ; output the LSN of A as hex
BLINK: equ 07bh ; Get a character in A, while waiting blink cursor.
CPOS: equ 07ch ; Gets addr of first character in row pointed to by HL
SP2: equ 07eh ; output 2 spaces
SCALI: equ 07fh ; Exec the routine who's code is in E
; NAS-SYS 3 0C00h page vars
PORT0: equ 0c00h ; Copy of port 0 output status
KMAP: equ 0c01h ; Keyboard map, 9 bytes
ARGC: equ 0c0ah ; Routine number passed to SCALJ
ARGN: equ 0c0bh ; Number of values in input line
ARG1: equ 0c0ch ; Argument #1
ARG2: equ 0c0eh ; Argument #2
ARG3: equ 0c10h ; Argument #3
ARG4: equ 0c12h ; Argument #4
ARG5: equ 0c14h ; Argument #5
ARG6: equ 0c16h ; Argument #6
ARG7: equ 0c18h ; Argument #7
ARG8: equ 0c1ah ; Argument #8
ARG9: equ 0c1ch ; Argument #9
ARG10: equ 0c1eh ; Argument #10
ARG69: equ ARG6
ARGLEN: equ (ARG10-ARG1)+2 ; Length of arguments
NUMN: equ 0c20h ; Number of arguments examined by routine NUM
NUMV: equ 0c21h ; Number returned by NUM
BRKADR: equ 0c23h ; Breakpoint address
BRKVAL: equ 0c25h ; Saved value from breakpoint address
CONFLG: equ 0c26h ; Normally 0 but set to -1 for E command
KOPT: equ 0c27h ; Keyboard option see K command
XOPT: equ 0c28h ; X option see X command.
CURSOR: equ 0c29h ; Position of cursor
ARGX: equ 0c2bh ; last command entered
KCNT: equ 0c2ch ; Keyboard repeat counter
KLONG: equ 0c2eh ; Keyboard initial delay before repeat
KSHORT: equ 0c30h ; Leyboard repeat speed between repeats
KBLINK: equ 0c32h ; Cursor blink speed.
MONSTK: equ 0c34h ; Monitor (NAS-SYS) stack area
RBC: equ 0c61h ; Register BC save
RDE: equ 0c63h ; Register DE save
RHL: equ 0c65h ; Register HL save
RAF: equ 0c67h ; Register AF save
RPC: equ 0c69h ; Register PC save
RSP: equ 0c6bh ; Register SP save
KTABL: equ 0c6dh ; Length of keyboard table
KTAB: equ 0c6fh ; Address of last byte in keyboard table
STAB: equ 0c71h ; Start of routine addresses for routine 00
SOUT: equ 0c73h ; Start of table of output routines
SIN: equ 0c75h ; Start of table of input routines
SUOUT: equ 0c77h ; Jump to user output routine
SUIN: equ 0c7ah ; Jump to user input routine
SNMI: equ 0c7dh ; Address of breakpoint / NMI routine.
SYSSTACK: equ 01000h ; System stack
; Floppy controller WD179x or WD279x
CmdStatReg: equ 0xe0
TrackReg: equ 0xe1
SectorReg: equ 0xe2
DataReg: equ 0xe3
CTRLReg: equ 0xe4
INTReg: equ 0xe5
DOSErrBadFn: equ 0x00 ; Bad ARH / BRH function
DOSErrDirEnd: equ 0x01 ; End of directory reached, need to ]C
DOSErrNotOpen: equ 0x02 ; File being accessed is not open
DOSErrPastEOF: equ 0x03 ; Specified rel sector is past EOF.
DOSErrNoSpace: equ 0x04 ; No spece to extend / save file.
DOSErr05: equ 0x05
DOSErr1F: equ 0x1f
DOSErrTimeOut: equ 0xfd ; Time out talking to FDC
DOSErrInvDat: equ 0xfe ; Invalid data
DOSErrInvFmt: equ 0xff ; Invalid format
; FDC commands
WDCmdRestore: equ 0x00 ; Restore to track 0
WDCmdSeek: equ 0x10 ; Seek to track command
WDCmdStep: equ 0x20 ; Step heads
WDCmdStepIn: equ 0x40 ; Step heads in
WDCmdStepOut: equ 0x60 ; Step heads out
WDCmdReadSec: equ 0x80 ; Read sector command
WDCmdWriteSec: equ 0xA0 ; Write sector command
WDCmdReadAddr: equ 0xC0 ; Read address mark
WDCmdForceInt: equ 0xD0 ; Force inturrupt
WDCmdReadTrack: equ 0xE0 ; Read a track
WDCmdWriteTrack: equ 0xF0 ; Write (format) track
; FDC command options
WDCStep6ms: equ 0x00 ; Type 1 step rate 0, 6ms
WDCStep12ms: equ 0x01 ; Type 1 step rate 1, 12ms
WDCStep20ms: equ 0x02 ; Type 1 step rate 2, 20ms
WDCStep30ms: equ 0x03 ; Type 1 step rate 3, 30ms
WDCVerifyTrk: equ 0x04 ; Type I verify track
WDCHeadLoad: equ 0x08 ; Type 1 head load
WDCTrkUpdate: equ 0x10 ; Type 1 track update (steps only)
WDCSideComp: equ 0x02 ; Type II side compare (x791, x793)
WDCSetSSO: equ 0x02 ; Type II update SSO (x795, x797)
WDCDelay5ms: equ 0x04 ; Type II / III command delay
WDCSide1: equ 0x08 ; Type II Compare for side 1 (x791, x793)
WDCMultiple: equ 0x10 ; Type II multiple sectors
; Define this to WDCStepXms, Where X= 6,12,20,30 as defined above to globally set step rate.
; Early versions used 30ms, later versions used 20ms or even 12ms,
; with suitable drives this can be set to 6ms. e.g. TEAC FD55-F or most 3.5" drives.
WDCStepRate: equ WDCStep20ms
; FDC Status bits
; Type I
WDSTNotReady: equ 0x80 ; Drive not ready
WDSTWriteProt: equ 0x40 ; Drive write protected
WDSTHeadLoad: equ 0x20 ; Head is loaded
WDSTSeekErr: equ 0x10 ; Error seeking to track
WDSTCRCErr: equ 0x08 ; CRC error
WDSTTrk0: equ 0x04 ; Heads are at track 0
WDSTIndex: equ 0x02 ; Index pulse from drive
WDSTBusy: equ 0x01 ; Controller is busy
WDSTRNF: equ 0x10 ; Record not found
WDSTRecordType: equ 0x20 ; Record type
WDSTLostData: equ 0x04 ; Lost data
WDSTDRQ: equ 0x02 ; Copy of DRQ line
; Control reg E4, read
CTLBDS0: equ 0x01 ; Drive select 0
CTLBDS1: equ 0x02 ; Drive select 1
CTLBDS2: equ 0x04 ; Drive select 2
CTLBDS3: equ 0x08 ; Drive select 3
CTLBSide: equ 0x10 ; Side select (if 1793 / 2793) & LK2 A-C
CTRLBSpare1: equ 0x20 ; Spare 1 connected to LK3
CTRLBDDEN: equ 0x40 ; Double desnity enable DD=1, SD=0
CTRLBSpare2: equ 0x80 ; Spare 2 connected to LK4
MaskDrives: equ CTLBDS0 + CTLBDS1 + CTLBDS2 + CTLBDS3
MaskDriveSide: equ MaskDrives + CTLBSide
; Control reg E4, write
; Bits 0..3 DS0 to DS3 will be as last write
; Bit 4 Side select will be valid only if LK2 connects A & C
; Bit 6 will be as last written
; Bit 7 connected to LK4
CTRLBMotor: equ 0x20 ; Low stops motor, high starts motor, times out after 10s
; Control reg E5, read only
; Bits 2..6 unused.
CTRLBIntRQ: equ 0x01 ; Int rq from FDC
CTRLBNotReady: equ 0x02 ; For this to be low motor must be on and in the case of 8" drives LK1
; must be present and READY i/p must be true.
CTRLBDRQ: equ 0x80 ; DRQ from FDC.
; DOS constants
DOSSecPerTrk: equ 010h ; Sectors per track
DOSTrkPerDsk: equ 04Dh ; Tracks per disk : 77 (was 050h(80) in hacked bios in MAME)
DOSSides: equ 001h ; Sides per disk
DOSSecSize: equ 00100h ; sector size in bytes
DOSDataSecs: equ (DOSTrkPerDsk-1) * DOSSecPerTrk
DOSFormatBuf: equ 01000h ; Where format buffer is in memory
DOSRawSecBuf: equ DOSFormatBuf + DOSSecPerTrk ; buffer for raw sector data for format
DOSMaxFNLen: equ 008h ; Max filename length
DOSSeperator: equ ':' ; Dos seperator character ':'
DOSUserAddr: equ 01000h ; Address userboot loaded at
DOSMaxPrep: equ 00030h ; default max sectors to allocate with prep
DOSEoFMarker: equ 0ffh ; End of file marker
DOSInvalid: equ 0ffh ; Invalid / closed flag
;Dos workspace
USRMCP: equ 0x0d00 ; user master control program
WFDC: equ 0x0d03 ; Jump to cold start DOS
CMDCHR: equ 0x0d06 ; Command character normally ']'
WCMTAB: equ 0x0d07 ; Start of command table
WFILENAME: equ 0x0d09 ; Filename being accessed ?
WKSPACE: equ 0x0d18 ; Workspace (8 bytes).
PHYSDRV: equ WKSPACE+0 ; Current physical drive
WDCMD: equ WKSPACE+1 ; Currently executing command
WDRV: equ 0x0d20 ; Drive number to be accessed
WFILE: equ 0x0d21 ; Filename address
WEXEC: equ 0x0d23 ; Exec address
WSECT: equ 0x0d25 ; Random sector number for BRH
WSIZE: equ 0x0d27 ; Max number of sectors to allocate during #prep
USDIO: equ 0x0d29 ; User disk I/O error routine
WDIRP: equ 0x0d2C ; Directory pointer
WDIRS: equ 0x0d2e ; Next dir sector to be read
WDDRV: equ 0x0d2f ; Last dir drive accessed
WONME: equ 0x0d30 ; Current output filename (if open)
; Offsets within WFPIN and WFPOT
FPST: equ 000h ; Start track
FPSS: equ 001h ; Start sector
FPLN: equ 002h ; Length of file (in sectors) at open
FPDN: equ 004h ; Drive number where file located
FPTK: equ 005h ; Current track pointer within file
FPSE: equ 006h ; Current sector pointer within file
WIBP: equ 0x0d38 ; Input file pointer within buffer
WFPIN: equ 0x0d3A ; Input file pointers
WFPINST: equ WFPIN+FPST ; Start track
WFPINSS: equ WFPIN+FPSS ; Start sector
WFPINLN: equ WFPIN+FPLN ; Length of file (in sectors) at open
WFPINDN: equ WFPIN+FPDN ; Drive number where file located
WFPINTK: equ WFPIN+FPTK ; Current track pointer within file
WFPINSE: equ WFPIN+FPSE ; Current sector pointer within file
WOBP: equ 0x0d41 ; Output buffer pointer within buffer
WFPOT: equ 0x0d43 ; Output file pointers
WFPOTST: equ WFPOT+FPST ; Start track
WFPOTSS: equ WFPOT+FPSS ; Start sector
WFPOTLN: equ WFPOT+FPLN ; Length of file (in sectors) at open
WFPOTDN: equ WFPOT+FPDN ; Drive number where file located
WFPOTTK: equ WFPOT+FPTK ; Current track pointer within file
WFPOTSE: equ WFPOT+FPSE ; Current sector pointer within file
WIBFL: equ 0x0d4a ; Input buffer location
WOBFL: equ 0x0d4c ; Output buffer location
WDTAB: equ 0x0d4e ; Address of ARH table
DWDRV: equ 0x0de9 ; working drive whilst reading file
DSAVESP: equ 0x0dea ; Saved SP
DOSDirBuff: equ 00e00h ; DOS Directory buffer
DOSDirBuffEnd: equ DOSDirBuff + DOSSecSize
; Opcodes used to fill in vectors etc
OpCodeJP: equ 0c3h
; ARH Codes
AINITD: equ 001h ; Initialize drive
AFORM: equ 002h ; Format a disk
ACHAIN: equ 003h ; Chain another program
ACRATE: equ 004h ; Create a directory entry
ASCRAT: equ 005h ; Scratch a directory entry
ASCAND: equ 006h ; Scan directory
AOPEND: equ 00ah ; Open a directory
AOPENI: equ 00bh ; Open input file
AOPENO: equ 00ch ; Open output file
APREPO: equ 00dh ; Prepare new output file
AREAD: equ 014h ; Direct read
AREADD: equ 015h ; Read directory
AREADS: equ 016h ; Read sequential
AREADR: equ 017h ; Read random
AREADF: equ 018h ; Read whole file
AREADH: equ 019h ; Read directory header
ASAVE: equ 01eh ; Direct save
ASAVED: equ 01fh ; Directory save
ASAVES: equ 020h ; Save sequential
ASAVER: equ 021h ; Save random
ASAVEF: equ 022h ; Save whole file
ASAVEH: equ 023h ; Save directory header
ACLSEI: equ 028h ; Close input file
ACLSEO: equ 029h ; Close output file
; BRH Codes, these are a subset of the ARH codes
BINITD: equ AINITD ; Initialize drive
BCHAIN: equ ACHAIN ; Chain another program
BSCRAT: equ ASCRAT ; Scratch a directory entry
BOPENI: equ AOPENI ; Open input file
BOPENO: equ AOPENO ; Open output file
BPREPO: equ APREPO ; Prepare new output file
BREADS: equ AREADS ; Read sequential
BREADR: equ AREADR ; Read random
BSAVES: equ ASAVES ; Save sequential
BSAVER: equ ASAVER ; Save random
BCLSEI: equ ACLSEI ; Close input file
BCLSEO: equ ACLSEO ; Close output file
; DIR entry offsets
DIRFilename: equ 000h ; Filename
DIRExecAddr: equ 008h ; Exec addresss
DIRLoadAddr: equ 00Ah ; Load address
DIRTrack: equ 00Ch ; Start track
DIRSector: equ 00Dh ; Start sector
DIRFlen: equ 00Eh ; File length
DIREntryLen: equ DIRFlen+2 ; Length of each dir entry
DIRFirstSec: equ 003h ; First sector of dir
DIRSize: equ (DOSSecPerTrk - DIRFirstSec)+1
DIRCleanAddr: equ 01000h ; Load address when cleaning dir
DIRNewAddr: equ 01e00h ; Address where new dir built up
DIREntryCount: equ (DIRSize * DOSSecSize) / DIREntryLen
DIRDeleted: equ 0feh ; Deleted file marker
DIRHeadFlag: equ 0eeh ; Flag to read / write dir header
; 8K ROM Basic defs
BASBaseAddr: equ 01000h ; Base address of basic
BASTXT: EQU 105EH ; Pointer to start of program
PROGND: EQU 10D6H ; End of program
VAREND: EQU 10D8H ; End of variables
ARREND: EQU 10DAH ; End of arrays
BASVarSize: equ 006h ; Size of basic variable definition
TokREM: equ 08eh ; REM basic token
; basic calls
CPDEHL: equ 0e68ah ; Compare DE & HL
; NAS-PEN defs
PENBaseAddr: equ 01000h ; Base address of NAS-PEN
PENEndText: equ 0101ah ; End of text pointer
PENCold: equ 0b800h ; NAS-PEN Cold start
PENWarm: equ 0b806h ; NAS-PEN Warm start
; Zeap defs
ZEPBaseAddrPtr: equ 00f00h ; Base address pointer to Zeap source file