os.asm

\ OS function vectors

USERV = &0200
BRKV = &0202
IRQ1V = &0204
IRQ2V = &0206
CLIV = &0208
BYTEV = &020A
WORDV = &020C
WRCHV = &020E
RDCHV = &0210
FILEV = &0212
ARGSV = &0214
BGETV = &0216
BPUTV = &0218
GBPBV = &021A
FINDV = &021C
FSCV = &021E
EVNTV = &0220
UPTV = &0222
NETV = &0224
VDUV = &0226
KEYV = &0228
INSBV = &022A
REMVB = &022C
CNPV = &022E
IND1V = &0230
IND2V = &0232
IND3V = &0234

\ OS function call locations

OSFSC  = &F1B1 \ filing system control (entry via FSCV)

OSWRSC = &FFB3 \ write byte to screen
OSRDSC = &FFB9 \ read byte from screen

OSNULL = &FFA6 \ blank function handler (just an RTS)

VDUCHR = &FFBC \ VDU character output
OSEVEN = &FFBF \ generate an EVENT
GSINIT = &FFC2 \ initialise OS string
GSREAD = &FFC5 \ read character from input stream
NVRDCH = &FFC8 \ non vectored OSRDCH
NVWRCH = &FFCB \ non vectored OSWRCH
OSFIND = &FFCE \ open or close a file
OSGBPB = &FFD1 \ transfer block to or from a file
OSBPUT = &FFD4 \ save a byte to file
OSBGET = &FFD7 \ get a byte from file
OSARGS = &FFDA \ read or write file attributes
OSFILE = &FFDD \ read or write a file
OSRDCH = &FFE0 \ get a byte from current input stream
OSASCI = &FFE3 \ output a byte to VDU stream expanding CR (&0D) to CR/LF (&0A,&0D)
OSNEWL = &FFE7 \ output a CR/LF to VDU stream
OSWRCH = &FFEE \ output a character to the VDU stream
OSWORD = &FFF1 \ perform operation using parameter table
OSBYTE = &FFF4 \ perform operation on single byte
OSCLI  = &FFF7 \ pass string to command line interpreter

\ Other constants

MODE0BASE = &3000
MODE1BASE = &3000
MODE2BASE = &3000
MODE3BASE = &4000
MODE4BASE = &5800
MODE5BASE = &5800
MODE6BASE = &6000
MODE7BASE = &7C00
ROMSBASE = &8000