244 lines
3.8 KiB
NASM
244 lines
3.8 KiB
NASM
;
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; main.s
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; cd-online-basic-system-integration
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;
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; Created by Rob Greene on 9/14/15.
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; Copyright (c) 2015 Rob Greene. All rights reserved.
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;
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.PC02 ; Enable 65C02 instructions
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; ASCII string with high-bit set, terminated by a zero
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.macro asciizh string
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.repeat .strlen(string),i
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.byte .strat(string,i) | $80
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.endrep
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.byte 0
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.endmacro
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; Dextral (right-most) Character Inverted
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.macro dci string
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.repeat .strlen(string),i
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.if .strlen(string) = i
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.byte .strat(string,i) | $80
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.else
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.byte .strat(string,i) & $7f
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.endif
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.endrep
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.endmacro
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; BASIC.SYSTEM locations:
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inbuf = $0200
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extrncmd = $be06 ; External command JMP vector
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xtrnaddr = $be50 ; Execution address of external command
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xlen = $be52 ; Length of command string-1
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xcnum = $be53 ; BASIC cmd number (external command = 0)
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pbits = $be54 ; Parameter bits
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vslot = $be61
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vdriv = $be62
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gosystem = $be70
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sonline = $bec6 ; BASIC.SYSTEM ONLINE parameter table
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sunitnum = $bec7
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sbufadr = $bec8
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getbufr = $bef5
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; MONITOR locations:
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crout = $fd8e
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prbyte = $fdda
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cout = $fded
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; Application stuff:
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buffer = $6800
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.org $2000
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install:
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ldy #0
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: lda _CodeStartAddress,y
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sta _CodeBeginAddress,y
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iny
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cpy #(_CodeEndAddress-_CodeBeginAddress)
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bne :-
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lda extrncmd+1
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sta nextcmd+1
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lda extrncmd
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sta nextcmd
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lda #>entry
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sta extrncmd
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lda #<entry
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sta extrncmd
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rts
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_CodeStartAddress:
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.org $6000
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_CodeBeginAddress:
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entry:
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ldx #0
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@again:
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ldy #0
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: lda cmdtable,x
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beq ourcommand
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cmp inbuf,y
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bne @nextcmd
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inx
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iny
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bra :-
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@nextcmd:
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inx
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lda cmdtable,x
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bne @nextcmd
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inx ; Skip jumps
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inx
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lda cmdtable,x
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bne @again
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notOurCommand:
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sec
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jmp (nextcmd)
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nextcmd: .word 0
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ourcommand:
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stx xlen
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lda cmdtable,x
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sta xtrnaddr
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lda cmdtable+1,x
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sta xtrnaddr+1
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stz xcnum
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lda #$10
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sta pbits
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lda #$04
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sta pbits+1
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stz vslot
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stz vdriv
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clc
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rts
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cmdtable:
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asciizh "CD"
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.addr cd
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asciizh "ONLINE"
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.addr online
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;
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; Perform CD command
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;
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cd:
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rts
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;
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; Perform ONLINE command
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; Note we use the input buffer address
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;
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; Buffer format is:
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; +000 DSSSLLLL D=Drive, SSS=Slot, LLLL=Length
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; +001 CHAR1 Name... or error code
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; ...
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; +015 CHAR15
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;
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; Output:
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; S7 D1 /HDD
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; S6 D1 Err=$28
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; S5 D1 Err=$57 (S7 D1)
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;
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online:
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stz sunitnum
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stz sbufadr
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lda #>buffer
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sta sbufadr+1
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lda #$C5 ; ONLINE system command
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jsr gosystem
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bcc @continue
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rts
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@continue:
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ldx #0
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@loop:
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ldy buffer,x
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beq @exit
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jsr printsd
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lda #' '|$80
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jsr cout
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tya
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and #$0f
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beq @deverr
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tay
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lda #'/'|$80
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: jsr cout
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inx
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lda buffer,x
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ora #$80
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dey
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bpl :-
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@adjust:
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jsr crout
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txa
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and #$0f ; Check if we advanced past this buffer
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beq @loop
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txa
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and #$f0
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clc
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adc #$10
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tax
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bne @loop
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@exit:
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jmp crout
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; A device error message
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@deverr:
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lda #'E'|$80
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jsr cout
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lda #'R'|$80
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jsr cout
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jsr cout
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lda #'='|$80
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jsr cout
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inx
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lda buffer,x
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tay ; short-term save
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jsr prbyte
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tya
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cmp #$57 ; duplicate volume error
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bne @adjust
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lda #' '|$80
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jsr cout
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lda #'('|$80
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jsr cout
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inx
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ldy buffer,x
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jsr printsd
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lda #')'|$80
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jsr cout
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bra @adjust
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printsd:
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lda #'S'|$80
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jsr cout
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tya
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and #$70
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lsr
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lsr
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lsr
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lsr
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ora #'0'|$80
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jsr cout
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lda #','|$80
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jsr cout
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lda #'D'|$80
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jsr cout
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tya
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and #$80
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asl ; Drive 2 will set carry...
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adc #'1'|$80 ; ... making the '1' a '2'
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jmp cout
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_CodeEndAddress:
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