* KERNEL/OSWOSB.S ***************** XC ; 65c02 ************************* * OSBYTE DISPATCH TABLE * ************************* BYTWRDADDR DW BYTE00 ; OSBYTE 0 - Machine host * DW BYTE01 ; OSBYTE 1 - User flag * DW BYTE02 ; OSBYTE 2 - OSRDCH source * DW BYTE03 ; OSBYTE 3 - OSWRCH dest * DW BYTE04 ; OSBYTE 4 - Cursor keys BYTWRDLOW BYTESZLO EQU BYTWRDLOW-BYTWRDADDR BYTELOW EQU BYTESZLO/2-1 ; Maximum low OSBYTE BYTEHIGH EQU $7C ; First high OSBYTE DW BYTE7C ; OSBYTE 124 - Clear Escape DW BYTE7D ; OSBYTE 125 - Set Escape DW BYTE7E ; OSBYTE 126 - Ack. Escape DW BYTE7F ; OSBYTE 127 - Read EOF DW BYTE80 ; OSBYTE 128 - ADVAL DW BYTE81 ; OSBYTE 129 - INKEY DW BYTE82 ; OSBYTE 130 - Memory high word DW BYTE83 ; OSBYTE 131 - MEMBOT DW BYTE84 ; OSBYTE 132 - MEMTOP DW BYTE85 ; OSBYTE 133 - MEMTOP for MODE DW BYTE86 ; OSBYTE 134 - POS, VPOS DW BYTE87 ; OSBYTE 135 - Character, MODE * DW BYTE88 ; OSBYTE 136 - *CODE * DW BYTE89 ; OSBYTE 137 - *MOTOR * DW BYTE8A ; OSBYTE 138 - Buffer insert * DW BYTE8B ; OSBYTE 139 - *OPT * DW BYTE8C ; OSBYTE 140 - *TAPE * DW BYTE8D ; OSBYTE 141 - *ROM * DW BYTE8E ; OSBYTE 142 - Enter language * DW BYTE8F ; OSBYTE 143 - Service call BYTWRDTOP DW BYTEVAR ; OSBYTE 166+ - Read/Write OSBYTE variable * Maximum high OSBYTE BYTESZHI EQU BYTWRDTOP-BYTWRDLOW BYTEMAX EQU BYTESZHI/2+BYTEHIGH-1 ************************* * OSWORD DISPATCH TABLE * ************************* OSWBASE DW WORD00 ; OSWORD 0 - Read input line DW WORD01 ; OSWORD 1 - Read elapsed time DW WORD02 ; OSWORD 2 - Write eleapsed time DW WORD03 ; OSWORD 3 - Read interval timer DW WORD04 ; OSWORD 4 - Write interval timer DW WORD05 ; OSWORD 5 - Read I/O memory DW WORD06 ; OSWORD 6 - Write I/O memory * DW WORD07 ; OSWORD 7 - SOUND * DW WORD08 ; OSWORD 8 - ENVELOPE * DW WORD09 ; OSWORD 9 - POINT * DW WORD0A ; OSWORD 10 - Read character bitmap * DW WORD0B ; OSWORD 11 - Read palette * DW WORD0C ; OSWORD 12 - Write palette * DW WORD0D ; OSWORD 13 - Read coordinates OSWEND DW WORDE0 ; OSWORD &E0+ - User OSWORD * Offset to start of OSWORD table WORDSZOFF EQU OSWBASE-BYTWRDADDR WORDOFF EQU WORDSZOFF/2 * Maximum OSWORD WORDSZ EQU OSWEND-OSWBASE WORDMAX EQU WORDSZ/2-1 ************************ * OSWORD/OSBYTE dispatch ************************ * OSWORD: * On entry, A=action * XY=>control block * On exit, A=preserved * X,Y,Cy trashed (except OSWORD 0) * control block updated * WORDHND PHA PHP SEI STA OSAREG ; Store registers STX OSCTRL+0 ; Point to control block STY OSCTRL+1 LDX #$08 ; X=SERVWORD CMP #$E0 ; User OSWORD BCS WORDGO1 CMP #WORDMAX+1 BCS BYTWRDFAIL ; Pass on to service call ADC #WORDOFF BCC BYTWRDCALL ; Call OSWORD routine WORDGO1 LDA #WORDOFF+WORDMAX+1 BCS BYTWRDCALL ; Call User OSWORD routine * OSBYTE: * On entry, A=action * X=first parameter * Y=second parameter if A>$7F * On exit, A=preserved * X=first returned result * Y=second returned result if A>$7F * Cy=any returned status if A>$7F * BYTEHND PHA PHP SEI STA OSAREG ; Store registers STX OSXREG STY OSYREG LDX #$07 ; X=SERVBYTE CMP #$A6 BCS BYTEGO1 ; OSBYTE &A6+ CMP #BYTEMAX+1 BCS BYTWRDFAIL ; Pass on to service call CMP #BYTEHIGH BCS BYTEGO2 ; High OSBYTEs CMP #BYTELOW+1 BCS BYTWRDFAIL ; Pass on to service call STZ OSYREG ; Prepare Y=0 for low OSBYTEs BCC BYTEGO3 BYTEGO1 LDA #BYTEMAX+1 ; Index for BYTEVAR BYTEGO2 SBC #BYTEHIGH-BYTELOW-1 ; Reduce OSBYTE number BYTEGO3 ORA #$80 ; Will become CS=OSBYTE call BYTWRDCALL ASL A ; Index into dispatch table TAY ; Y=offset into dispatch table * BIT FXNETCLAIM ; Check Econet intercept flag * BPL BYTWRDNONET ; No intercept, skip past * TXA ; Set A=BYTE or WORD call * CLV ; Clear V * JSR CALLNET ; Call Econet with X=call type * BVS BYTWRDEXIT ; V now set, claimed by NETV BYTWRDNONET LDA BYTWRDADDR+1,Y ; Get routine address STA OSINTWS+1 LDA BYTWRDADDR+0,Y STA OSINTWS+0 LDA OSAREG ; Get A parameter back LDY OSYREG ; Get Y parameter back LDX OSXREG ; Get X parameter, set EQ from it BCS BYTWRDGO ; Skip if OSBYTE call LDY #$00 ; OSWORD call, enter with Y=0 LDA (OSCTRL),Y ; and A=first byte in control block SEC ; Enter routine with CS BYTWRDGO JSR JMPADDR ; Call the routine * Routines are entered with: * A=OSBYTE call or first byte of OSWORD control block * X=X parameter * Y=OSBYTE Y parameter for A>$7F * Y=$00 for OSBYTE A<$80 * Y=$00 for OSWORD so (OSCTRL),Y => first byte * Carry Set * EQ set from OSBYTE X or from OSWORD first byte * X,Y,Cy from routine returned to caller BYTWRDEXIT ROR A ; Move Carry to A PLP ; Restore original flags ROL A ; Move Carry back to flags PLA ; Restore A CLV ; Clear V = Actioned RTS BYTWRDFAIL * JSR SERVICE ; Offer to sideways ROMs * LDX OSXREG ; Get returned X * CMP #$00 * BEQ BYTWRDEXIT ; Claimed, return JSR UNSUPBYTWRD ; *DEBUG* LDX #$FF ; X=&FF if unclaimed PLP ; Restore IRQs PLA ; Restore A BIT SETV ; Set V = Not actioned RTS SETV ; JMP() is $6C, bit 6 set to set V * JMPADDR JMP (OSINTWS) * Merlin doesn't like the above JMPADDR JMP ($00FA) * OSWORD &00 - Read a line of input *********************************** * On entry, (OSCTRL)=>control block * Y=0, A=(OSCTRL) * On exit, Y=length of line, offset to * CC = Ok, CS = Escape * XC ; 65c02 WORD00 IF MAXLEN-OSTEXT-2 LDY #$04 :WORD00LP1 LDA (OSCTRL),Y ; Copy MAXLEN, MINCH, MAXCH to workspace STA MAXLEN-2,Y DEY CPY #$02 BCS :WORD00LP1 :WORD00LP2 LDA (OSCTRL),Y ; (OSTEXT)=>line buffer STA OSTEXT,Y DEY BPL :WORD00LP2 INY ; Initial line length = zero ELSE LDA (OSCTRL),Y ; Copy control block STA OSTEXT,Y ; 0,1 => text INY ; 2 = MAXLEN CPY #$05 ; 3 = MINCHAR BCC WORD00 ; 4 = MAXCHAR LDY #$00 ; Initial line length = zero FIN * STY FXLINES ; Reset line counter CLI BEQ :WORD00LP ; Enter main loop :WORD00BELL LDA #$07 ; $07=BELL DEY ; Balance next INY :WORD00NEXT INY ; Step to next character :WORD00ECHO JSR OSWRCH ; Print character :WORD00LP JSR OSRDCH BCS :WORD00ESC ; Escape * TAX ; Save character in X * LDA FXVAR03 ; Get FX3 destination * ROR A * ROR A ; Move bit 1 into Carry * TXA ; Get character back * BCS :WORD00TEST ; VDU disabled, ignore * LDX FXVDUQLEN ; Get length of VDU queue * BNE :WORD00ECHO ; Not zero, just print :WORD00TEST CMP #$7F ; Delete BNE :WORD00CHAR CPY #$00 BEQ :WORD00LP ; Nothing to delete DEY ; Back up one character BCS :WORD00ECHO ; Loop back to print DEL :WORD00CHAR CMP #$15 ; Ctrl-U BNE :WORD00INS ; No, insert character LDA #$7F ; Delete character INY ; Balance first DEY :WORD00ALL DEY ; Back up one character BEQ :WORD00LP ; Beginning of line JSR OSWRCH ; Print DELETE JMP :WORD00ALL ; Loop to delete all :WORD00INS STA (OSTEXT),Y ; Store the character CMP #$0D BEQ :WORD00CR ; CR - Done CPY MAXLEN BCS :WORD00BELL ; Too long, beep CMP MINCHAR BCC :WORD00ECHO ; MAXCHAR, don't step to next :WORD00CR JSR OSNEWL * JSR CALLNET ; Call Econet Vector, A=13 :WORD00ESC LDA ESCFLAG ; Get Escape flag ROL A ; Carry=Escape state RTS * OSWORD &01 - Read elapsed time * OSWORD &02 - Write elapsed time * OSWORD &03 - Read countdown timer * OSWORD &04 - Write countdown timer ************************************ * On entry, (OSCTRL)=>control block * Y=0 WORD01 TYA ; Dummy, just return zero :WORD01LP STA (OSCTRL),Y INY CPY #$05 BCC :WORD01LP WORD04 WORD03 WORD02 RTS ; Dummy, do nothing * OSWORD &05 - Read I/O memory * OSWORD &06 - Write I/O memory *********************************** * On entry, (OSCTRL)+0 address * (OSCTRL)+4 byte read or written * Y=0, A=(OSCTRL) XC ; 65c02 WORD05 JSR GETADDR ; Point to address, set X and Y * needs to switch to main memory LDA (OSINTWS) ; Get byte * needs to switch back STA (OSCTRL),Y ; Store it RTS WORD06 JSR GETADDR ; Point to address, set X and Y LDA (OSCTRL),Y ; Get byte * needs to switch to main memory STA (OSINTWS) ; Store it * needs to switch back RTS GETADDR STA OSINTWS+0 ; (OSINTWS)=>byte to read/write INY LDA (OSCTRL),Y STA OSINTWS+1 LDY #$04 ; Point Y to data byte RTS * KERNEL/BWMISC.S ***************** * Here until tidied BYTE00 LDX #$0A ; $00 = identify Host RTS BYTE7C LDA ESCFLAG ; $7C = clear escape condition AND #$7F ; Clear MSbit STA ESCFLAG RTS BYTE7D ROR ESCFLAG ; $7D = set escape condition RTS BYTE7E LDA ESCFLAG ; $7E = ack detection of ESC AND #$7F ; Clear MSB STA ESCFLAG LDX #$FF ; Means ESC condition cleared RTS BYTE7F PHY ; $7F = check for EOF JSR CHKEOF PLY RTS BYTE82 LDY #$00 ; $82 = read high order address LDX #$00 ; $0000 for language processor RTS BYTE83 LDY #$0E ; $83 = read bottom of user mem LDX #$00 ; $0E00 RTS BYTE84 LDY #$80 ; $84 = read top of user mem LDX #$00 RTS BYTE85 LDY #$80 ; $85 = top user mem for mode LDX #$00 RTS BYTE8B LDA #$00 ; $8B = *OPT JMP (FSCV) ; Hand over to filing system BYTEDA RTS ; $DA = clear VDU queue BYTEEA LDX #$00 ; No tube RTS ; $EA = Tube presence UNSUPBYTWRD LDA #OSBYTEM CPX #7 BEQ UNSUPGO LDA #OSWORDM UNSUPGO JSR PRSTR LDA OSAREG JSR OUTHEX LDA #OSBM2 JMP PRSTR OSBYTEM ASC 'OSBYTE($' DB $00 OSWORDM ASC 'OSWORD($' DB $00 OSBM2 ASC ').' DB $00 BYTEVAR LDX #$00 LDY #$00 WORDE0 RTS