2021-08-10 01:27:44 +00:00
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* KERNEL/OSWOSB.S
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*****************
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XC ; 65c02
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*************************
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* OSBYTE DISPATCH TABLE *
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*************************
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BYTWRDADDR DW BYTE00 ; OSBYTE 0 - Machine host
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2021-08-15 03:57:46 +00:00
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DW BYTE01 ; OSBYTE 1 - User flag
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DW BYTE02 ; OSBYTE 2 - OSRDCH source
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DW BYTE03 ; OSBYTE 3 - OSWRCH dest
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2021-08-10 01:27:44 +00:00
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* DW BYTE04 ; OSBYTE 4 - Cursor keys
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BYTWRDLOW
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BYTESZLO EQU BYTWRDLOW-BYTWRDADDR
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BYTELOW EQU BYTESZLO/2-1 ; Maximum low OSBYTE
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BYTEHIGH EQU $7C ; First high OSBYTE
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DW BYTE7C ; OSBYTE 124 - Clear Escape
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DW BYTE7D ; OSBYTE 125 - Set Escape
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DW BYTE7E ; OSBYTE 126 - Ack. Escape
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DW BYTE7F ; OSBYTE 127 - Read EOF
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DW BYTE80 ; OSBYTE 128 - ADVAL
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DW BYTE81 ; OSBYTE 129 - INKEY
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DW BYTE82 ; OSBYTE 130 - Memory high word
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DW BYTE83 ; OSBYTE 131 - MEMBOT
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DW BYTE84 ; OSBYTE 132 - MEMTOP
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DW BYTE85 ; OSBYTE 133 - MEMTOP for MODE
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DW BYTE86 ; OSBYTE 134 - POS, VPOS
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DW BYTE87 ; OSBYTE 135 - Character, MODE
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2021-08-15 05:26:01 +00:00
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DW BYTE88 ; OSBYTE 136 - *CODE
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DW BYTE89 ; OSBYTE 137 - *MOTOR
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DW BYTE8A ; OSBYTE 138 - Buffer insert
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DW BYTE8B ; OSBYTE 139 - *OPT
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DW BYTE8C ; OSBYTE 140 - *TAPE
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DW BYTE8D ; OSBYTE 141 - *ROM
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DW BYTE8E ; OSBYTE 142 - Enter language
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DW BYTE8F ; OSBYTE 143 - Service call
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2021-08-10 01:27:44 +00:00
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BYTWRDTOP
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DW BYTEVAR ; OSBYTE 166+ - Read/Write OSBYTE variable
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* Maximum high OSBYTE
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BYTESZHI EQU BYTWRDTOP-BYTWRDLOW
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BYTEMAX EQU BYTESZHI/2+BYTEHIGH-1
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*************************
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* OSWORD DISPATCH TABLE *
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*************************
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OSWBASE DW WORD00 ; OSWORD 0 - Read input line
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DW WORD01 ; OSWORD 1 - Read elapsed time
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DW WORD02 ; OSWORD 2 - Write eleapsed time
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DW WORD03 ; OSWORD 3 - Read interval timer
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DW WORD04 ; OSWORD 4 - Write interval timer
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DW WORD05 ; OSWORD 5 - Read I/O memory
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DW WORD06 ; OSWORD 6 - Write I/O memory
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* DW WORD07 ; OSWORD 7 - SOUND
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* DW WORD08 ; OSWORD 8 - ENVELOPE
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* DW WORD09 ; OSWORD 9 - POINT
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* DW WORD0A ; OSWORD 10 - Read character bitmap
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* DW WORD0B ; OSWORD 11 - Read palette
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* DW WORD0C ; OSWORD 12 - Write palette
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* DW WORD0D ; OSWORD 13 - Read coordinates
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OSWEND
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DW WORDE0 ; OSWORD &E0+ - User OSWORD
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* Offset to start of OSWORD table
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WORDSZOFF EQU OSWBASE-BYTWRDADDR
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WORDOFF EQU WORDSZOFF/2
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* Maximum OSWORD
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WORDSZ EQU OSWEND-OSWBASE
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WORDMAX EQU WORDSZ/2-1
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************************
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* OSWORD/OSBYTE dispatch
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************************
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* OSWORD:
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* On entry, A=action
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* XY=>control block
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* On exit, A=preserved
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* X,Y,Cy trashed (except OSWORD 0)
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* control block updated
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*
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WORDHND PHA
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PHP
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SEI
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STA OSAREG ; Store registers
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STX OSCTRL+0 ; Point to control block
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STY OSCTRL+1
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LDX #$08 ; X=SERVWORD
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CMP #$E0 ; User OSWORD
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BCS WORDGO1
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CMP #WORDMAX+1
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BCS BYTWRDFAIL ; Pass on to service call
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ADC #WORDOFF
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BCC BYTWRDCALL ; Call OSWORD routine
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WORDGO1 LDA #WORDOFF+WORDMAX+1
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BCS BYTWRDCALL ; Call User OSWORD routine
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* OSBYTE:
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* On entry, A=action
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* X=first parameter
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* Y=second parameter if A>$7F
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* On exit, A=preserved
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* X=first returned result
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* Y=second returned result if A>$7F
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* Cy=any returned status if A>$7F
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*
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BYTEHND PHA
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PHP
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SEI
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STA OSAREG ; Store registers
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STX OSXREG
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STY OSYREG
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LDX #$07 ; X=SERVBYTE
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CMP #$A6
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BCS BYTEGO1 ; OSBYTE &A6+
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CMP #BYTEMAX+1
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BCS BYTWRDFAIL ; Pass on to service call
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CMP #BYTEHIGH
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BCS BYTEGO2 ; High OSBYTEs
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CMP #BYTELOW+1
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BCS BYTWRDFAIL ; Pass on to service call
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STZ OSYREG ; Prepare Y=0 for low OSBYTEs
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BCC BYTEGO3
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BYTEGO1 LDA #BYTEMAX+1 ; Index for BYTEVAR
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BYTEGO2 SBC #BYTEHIGH-BYTELOW-1 ; Reduce OSBYTE number
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BYTEGO3 ORA #$80 ; Will become CS=OSBYTE call
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BYTWRDCALL ASL A ; Index into dispatch table
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TAY ; Y=offset into dispatch table
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* BIT FXNETCLAIM ; Check Econet intercept flag
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* BPL BYTWRDNONET ; No intercept, skip past
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* TXA ; Set A=BYTE or WORD call
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* CLV ; Clear V
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* JSR CALLNET ; Call Econet with X=call type
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* BVS BYTWRDEXIT ; V now set, claimed by NETV
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BYTWRDNONET LDA BYTWRDADDR+1,Y ; Get routine address
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STA OSINTWS+1
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LDA BYTWRDADDR+0,Y
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STA OSINTWS+0
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LDA OSAREG ; Get A parameter back
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LDY OSYREG ; Get Y parameter back
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LDX OSXREG ; Get X parameter, set EQ from it
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BCS BYTWRDGO ; Skip if OSBYTE call
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LDY #$00 ; OSWORD call, enter with Y=0
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LDA (OSCTRL),Y ; and A=first byte in control block
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SEC ; Enter routine with CS
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BYTWRDGO JSR JMPADDR ; Call the routine
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* Routines are entered with:
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* A=OSBYTE call or first byte of OSWORD control block
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* X=X parameter
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* Y=OSBYTE Y parameter for A>$7F
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* Y=$00 for OSBYTE A<$80
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* Y=$00 for OSWORD so (OSCTRL),Y => first byte
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* Carry Set
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* EQ set from OSBYTE X or from OSWORD first byte
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* X,Y,Cy from routine returned to caller
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BYTWRDEXIT ROR A ; Move Carry to A
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PLP ; Restore original flags
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ROL A ; Move Carry back to flags
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PLA ; Restore A
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CLV ; Clear V = Actioned
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RTS
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BYTWRDFAIL
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* JSR SERVICE ; Offer to sideways ROMs
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* LDX OSXREG ; Get returned X
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* CMP #$00
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* BEQ BYTWRDEXIT ; Claimed, return
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JSR UNSUPBYTWRD ; *DEBUG*
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LDX #$FF ; X=&FF if unclaimed
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PLP ; Restore IRQs
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PLA ; Restore A
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BIT SETV ; Set V = Not actioned
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RTS
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SETV ; JMP() is $6C, bit 6 set to set V
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* JMPADDR JMP (OSINTWS)
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* Merlin doesn't like the above
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JMPADDR JMP ($00FA)
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* OSWORD &00 - Read a line of input
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***********************************
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* On entry, (OSCTRL)=>control block
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* Y=0, A=(OSCTRL)
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* On exit, Y=length of line, offset to <cr>
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* CC = Ok, CS = Escape
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*
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XC ; 65c02
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WORD00 IF MAXLEN-OSTEXT-2
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LDY #$04
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:WORD00LP1 LDA (OSCTRL),Y ; Copy MAXLEN, MINCH, MAXCH to workspace
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STA MAXLEN-2,Y
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DEY
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CPY #$02
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BCS :WORD00LP1
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:WORD00LP2 LDA (OSCTRL),Y ; (OSTEXT)=>line buffer
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STA OSTEXT,Y
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DEY
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BPL :WORD00LP2
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INY ; Initial line length = zero
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ELSE
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LDA (OSCTRL),Y ; Copy control block
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STA OSTEXT,Y ; 0,1 => text
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2021-08-15 05:26:01 +00:00
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INY ; 2 = MAXLEN
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2021-08-10 01:27:44 +00:00
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CPY #$05 ; 3 = MINCHAR
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BCC WORD00 ; 4 = MAXCHAR
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LDY #$00 ; Initial line length = zero
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FIN
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* STY FXLINES ; Reset line counter
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CLI
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BEQ :WORD00LP ; Enter main loop
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:WORD00BELL LDA #$07 ; $07=BELL
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DEY ; Balance next INY
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:WORD00NEXT INY ; Step to next character
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:WORD00ECHO JSR OSWRCH ; Print character
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:WORD00LP JSR OSRDCH
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BCS :WORD00ESC ; Escape
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* TAX ; Save character in X
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* LDA FXVAR03 ; Get FX3 destination
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* ROR A
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* ROR A ; Move bit 1 into Carry
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* TXA ; Get character back
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* BCS :WORD00TEST ; VDU disabled, ignore
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* LDX FXVDUQLEN ; Get length of VDU queue
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* BNE :WORD00ECHO ; Not zero, just print
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:WORD00TEST CMP #$7F ; Delete
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BNE :WORD00CHAR
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CPY #$00
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BEQ :WORD00LP ; Nothing to delete
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DEY ; Back up one character
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BCS :WORD00ECHO ; Loop back to print DEL
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:WORD00CHAR CMP #$15 ; Ctrl-U
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BNE :WORD00INS ; No, insert character
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LDA #$7F ; Delete character
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INY ; Balance first DEY
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:WORD00ALL DEY ; Back up one character
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BEQ :WORD00LP ; Beginning of line
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JSR OSWRCH ; Print DELETE
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JMP :WORD00ALL ; Loop to delete all
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:WORD00INS STA (OSTEXT),Y ; Store the character
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CMP #$0D
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BEQ :WORD00CR ; CR - Done
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CPY MAXLEN
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BCS :WORD00BELL ; Too long, beep
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CMP MINCHAR
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BCC :WORD00ECHO ; <MINCHAR, don't step to next
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CMP MAXCHAR
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BCC :WORD00NEXT ; <MAXCHAR, step to next
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BEQ :WORD00NEXT ; =MAXCHAR, step to next
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BCS :WORD00ECHO ; >MAXCHAR, don't step to next
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:WORD00CR JSR OSNEWL
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* JSR CALLNET ; Call Econet Vector, A=13
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:WORD00ESC LDA ESCFLAG ; Get Escape flag
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ROL A ; Carry=Escape state
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RTS
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* OSWORD &01 - Read elapsed time
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* OSWORD &02 - Write elapsed time
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* OSWORD &03 - Read countdown timer
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* OSWORD &04 - Write countdown timer
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************************************
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* On entry, (OSCTRL)=>control block
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* Y=0
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WORD01 TYA ; Dummy, just return zero
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:WORD01LP STA (OSCTRL),Y
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INY
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CPY #$05
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BCC :WORD01LP
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WORD04
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WORD03
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WORD02 RTS ; Dummy, do nothing
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* OSWORD &05 - Read I/O memory
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* OSWORD &06 - Write I/O memory
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***********************************
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* On entry, (OSCTRL)+0 address
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* (OSCTRL)+4 byte read or written
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* Y=0, A=(OSCTRL)
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XC ; 65c02
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WORD05 JSR GETADDR ; Point to address, set X and Y
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* needs to switch to main memory
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LDA (OSINTWS) ; Get byte
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* needs to switch back
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STA (OSCTRL),Y ; Store it
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RTS
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WORD06 JSR GETADDR ; Point to address, set X and Y
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LDA (OSCTRL),Y ; Get byte
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* needs to switch to main memory
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STA (OSINTWS) ; Store it
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* needs to switch back
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RTS
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GETADDR STA OSINTWS+0 ; (OSINTWS)=>byte to read/write
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INY
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LDA (OSCTRL),Y
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STA OSINTWS+1
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LDY #$04 ; Point Y to data byte
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RTS
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* KERNEL/BWMISC.S
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*****************
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* Here until tidied
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BYTE00 LDX #$0A ; $00 = identify Host
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RTS
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2021-08-15 03:57:46 +00:00
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BYTE01 LDA #$F1 ; $01 = read/write user flag
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JMP BYTEHND
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BYTE02 RTS ; $02 = select input stream
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BYTE03 RTS ; $03 = select output stream
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2021-08-10 01:27:44 +00:00
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BYTE7C LDA ESCFLAG ; $7C = clear escape condition
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AND #$7F ; Clear MSbit
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STA ESCFLAG
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RTS
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BYTE7D ROR ESCFLAG ; $7D = set escape condition
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RTS
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BYTE7E LDA ESCFLAG ; $7E = ack detection of ESC
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AND #$7F ; Clear MSB
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STA ESCFLAG
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LDX #$FF ; Means ESC condition cleared
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RTS
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BYTE7F PHY ; $7F = check for EOF
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JSR CHKEOF
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PLY
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RTS
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2021-08-10 13:24:08 +00:00
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BYTE82 LDY #$FF ; $82 = read high order address
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LDX #$FF ; $FFFF for I/O processor
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2021-08-10 01:27:44 +00:00
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RTS
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BYTE83 LDY #$0E ; $83 = read bottom of user mem
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LDX #$00 ; $0E00
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RTS
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BYTE84 LDY #$80 ; $84 = read top of user mem
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LDX #$00
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RTS
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BYTE85 LDY #$80 ; $85 = top user mem for mode
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LDX #$00
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RTS
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2021-08-15 05:26:01 +00:00
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* BYTE86 and BYTE87 are in AUXMEM.VDU.S
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BYTE88 JMP (USERV) ; $88 = *CODE
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BYTE89 RTS ; $89 = *MOTOR
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BYTE8A RTS ; $8A = insert val into buf
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2021-08-10 01:27:44 +00:00
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BYTE8B LDA #$00 ; $8B = *OPT
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JMP (FSCV) ; Hand over to filing system
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2021-08-15 05:26:01 +00:00
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BYTE8C RTS ; $8C = *TAPE
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BYTE8D RTS ; $8D = *ROM
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2021-08-15 03:42:06 +00:00
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* OSBYTE $8E - Enter language ROM
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BYTE8E PHP ; Save CLC=RESET, SEC=Not RESET
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LDA #$08
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STA FAULT+0
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LDA #$80
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STA FAULT+1
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JSR PRERR ; Print ROM name with PRERR to set FAULT
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JSR OSNEWL
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JSR OSNEWL
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PLP ; Get entry type back
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LDA #$01
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JMP AUXADDR
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* OSBYTE $8F - Issue service call
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* X=service call, Y=parameter
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BYTE8F TXA
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SERVICE LDX #$0F
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BIT $8006
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BPL :SERVSKIP ; No service entry
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JSR $8003 ; Call service entry
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TAX
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BEQ :SERVDONE
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:SERVSKIP LDX #$FF
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:SERVDONE RTS
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2021-08-10 01:27:44 +00:00
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BYTEDA RTS ; $DA = clear VDU queue
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BYTEEA LDX #$00 ; No tube
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RTS ; $EA = Tube presence
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UNSUPBYTWRD
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LDA #<OSBYTEM
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LDY #>OSBYTEM
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CPX #7
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BEQ UNSUPGO
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LDA #<OSWORDM
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LDY #>OSWORDM
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UNSUPGO JSR PRSTR
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LDA OSAREG
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JSR OUTHEX
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LDA #<OSBM2
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LDY #>OSBM2
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JMP PRSTR
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OSBYTEM ASC 'OSBYTE($'
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DB $00
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OSWORDM ASC 'OSWORD($'
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DB $00
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OSBM2 ASC ').'
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DB $00
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BYTEVAR LDX #$00
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LDY #$00
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WORDE0 RTS
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