482 lines
10 KiB
ArmAsm
482 lines
10 KiB
ArmAsm
; da65 V2.18 - Git ece63f0
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; Created: 2023-10-03 10:18:14
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; Input file: bitsy.bye
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; Page: 1
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OPEN_BUFFER := $0280
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L2000 := $2000
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L1400 := $1400
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PRODOS_MLI := $BF00
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DEVNUM := $BF30
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BITMAP := $BF58
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DRVSM2 := $C082
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INIT := $FB2F
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BASCALC := $FBC1
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BELL1 := $FBDD
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VTAB := $FC22
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HOME := $FC58
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RDKEY := $FD0C
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SETKBD := $FE89
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SETVID := $FE93
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CLR80VID := $C00C
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CLR80COL := $C000
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NEWVIDEO := $C029
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.macpack apple2
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.setcpu "6502"
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.org $1000
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cld
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lda DRVSM2 ; turn all drive phases off
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cli
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sta CLR80VID
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sta CLR80COL
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jsr SETVID
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jsr SETKBD
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sta $04FB
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jsr INIT
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jsr HOME
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ldx #$DF
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lda #$CF
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L101E: sta BITMAP-$df,x ; $BF58, aka BITMAP
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lda L135F -$df,x ; $134F
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sta $7A,x ; $0159
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lda #$00
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txs
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inx
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bne L101E
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.setcpu "65816" ; this is a NOP on 65x02
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rep #$02 ; reset processor status bits
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.setcpu "6502"
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beq L1034 ; branch-always on 6502
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inx ; only //gs
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stx NEWVIDEO ; only //gs
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L1034: inc BITMAP+$17 ; bitmap of low 48k of memory
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ldx #(L1356-L12FE-1) ; $57
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L1039: lda L12FE+1,x ; $1356
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bmi L1045
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jsr BASCALC ; row in a -> screen address in ($28)
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ldy L1300,x
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.byte $2C ; mask next ...
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L1045: sta ($28),y ; store directly to $(SCREEN) from BASCALC
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dey
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dex
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bne L1039
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L104B: sta $0480,y
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sta ($28),y
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dey
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bpl L104B
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; done drawing screen
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lda DEVNUM ; get current active slot (DSSS/0000)
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lsr a ; for 7, that's 0111/0000
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lsr a
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lsr a ; now 0000/1110
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tax
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inx
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cmp #$10 ; legit slot?
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bcc L1060
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L105F: dex
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L1060: jsr OPEN_PREFIX
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beq L105F
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L1065: lda #>L1400
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sta $7A+1
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sta $58+1
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ldy #<L1400
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sty $7A
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sty $58
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jsr OPEN_FILE
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cpy #$4C
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beq L107B
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jsr BELL1
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L107B: lda #$00
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tay
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sta ($7A),y
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tax
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L1081: stx $5E
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L1083: ldx #$22
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ldy $57
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cpy #$22
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bcs L108D
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ldy #$22
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L108D: dey
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lda #$A0
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cpy $57
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bcs L1098
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lda ($70),y
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ora #$80
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L1098: sta $0405,x
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sta $0381,y
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dex
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L109F: bne L108D
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ldx #$02
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stx $25
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L10A5: lda $57,x
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sta $59,x
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dex
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bne L10A5
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L10AC: jsr VTAB
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inc $25
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ldy #$14
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lda #$A1
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sta ($28),y
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lda $61,x
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L10B9: sta $0380,x
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lda #$FF
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cpx $5E
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bne L10CC
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lda $5A
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sta $5C
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lda $5B
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sta $5D
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lda #$3F
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L10CC: sta $5F
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ldy #$00
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lda ($5A),y
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bmi L10EF
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bne L10DD
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ldy #$10
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sta ($5A),y
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tay
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beq L10E4
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L10DD: lsr a
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lsr a
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lsr a
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lsr a
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and #$07
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tay
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L10E4: lda L1375,y
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ldy #$00
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sta ($28),y
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inc $28
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bne L10FD
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L10EF: lda #$A0
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sta ($28),y
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inc $28
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inc $28
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lda #$AF
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and $5F
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sta ($28),y
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L10FD: lda ($5A),y
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and #$0F
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sta $60
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L1103: lda #$A0
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cpy $60
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iny
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bcs L1110
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lda ($5A),y
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ora #$80
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and $5F
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L1110: sta ($28),y
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cpy #$11
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bne L1103
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lda #$0F
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adc $5A
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sta $5A
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bcc L1120
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inc $5B
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L1120: inx
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cpx #$14
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bcc L10AC
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stx $29
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jsr RDKEY ; get keypress
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cmp #$8D ; CR?
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bne L11A8
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; try to load and execute the selected file
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jsr PRODOS_MLI ; SET_PREFIX
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.byte $c6
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.word L12FD
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bcs L1191
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tay
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lda ($5C),y
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beq L11A2
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sty $7A
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ldx #$20
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L113F: stx $7B
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cmp #$60
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and #$0F
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bcs L1174
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sta ($5C),y
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inc $74
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dey
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jsr OPEN_FILE
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dey
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bmi L1164
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ldx L10B9+1
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lda #$C3
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sta $0305,x
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ldy #$FF
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L115C: jsr OPEN_FILE
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dec $74
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dey
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bpl L11A2
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L1164: ldy #$0F
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L1166: lda ($5C),y
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sta $2006,y
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dey
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bpl L1166
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EXEC_FILE: jsr HOME
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jmp L2000
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L1174: tay
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adc $57
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sta $57
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tax
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L117A: lda ($5C),y
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sta OPEN_BUFFER,x
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dex
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dey
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bpl L117A
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asl a
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lda #$AF
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sta $0281,x
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bcs L11A5
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jsr OPEN_FILE
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tya
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beq EXEC_FILE
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L1191: jsr BELL1
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BROWSER_BACK: ldy $57
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L1196: lda ($73),y
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dey
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beq L11A2
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tax
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bpl L1196
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sty $57
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bmi L11A5
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L11A2: jsr BELL1
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L11A5: jmp L1065
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L11A8: ldx $5E
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cmp #$95 ; right-arrow?
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bne L11E5
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L11AE: inx
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ldy #$10
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lda ($5C),y
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beq L11D1
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cpx #$0A
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bcc L120E
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inc $59
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ldy #$40
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lda ($58),y
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dec $59
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tay
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beq L120E
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lda $58
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ldy $59
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adc #$0F
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bcc L11CD
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iny
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L11CD: sta $58
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sty $59
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L11D1: jmp L1083
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L11D4: eor #$F8
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rol a
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tax
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eor $56
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lsr a
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bne L11E0
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bcs L11E0
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dex
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L11E0: jsr OPEN_PREFIX
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bpl L11A5
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L11E5: cmp #$9B ; ESC?
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beq BROWSER_BACK
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cmp #$C1 ; A?
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bcs L1221 ; branch if less than or equal to ...
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adc #$48 ; carry clear, so assume this is minimum $FA
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cmp #$F9
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bcs L11D4 ; if we are <= $F9, go to L11D4
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sbc #$CF ; now minimum $2c - "+"
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beq L1201
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tay
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dey
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beq L121C
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dey
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beq L11AE
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dey
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bne L11D1
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L1201: ldy $59
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lda $58
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bne L1211
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cpy #$14
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bne L1211
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L120B: dex
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L120C: bmi L11D1
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L120E: jmp L1081
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L1211: cpx #$0A
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bcs L120B
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sbc #$0F
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bcs L11CD
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dey
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bcc L11CD
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L121C: ldx $56
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jmp L105F
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L1221: and #$5F
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sta $60
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ldx #$00
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ldy $5C
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stx $5C
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inx
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L122C: tya
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clc
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adc #$10
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tay
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bcc L1235
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inc $5D
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L1235: lda ($5C),y
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beq L124A
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iny
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lda ($5C),y
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dey
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cmp $60
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bne L122C
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sty $58
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lda $5D
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sta $59
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jmp L107B
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L124A: dex
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bmi L120C
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tay
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lda #$14
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sta $5D
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bne L1235
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OPEN_PREFIX: txa
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and #$0F
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sta $56
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lsr a
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beq L127C
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php
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ora #$b0
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sta $0401
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asl a
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asl a
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asl a
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asl a
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plp
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ldy #$B1
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bcs L126E
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ora #$80
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iny
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L126E: sta $6F
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L1270: sty $0404
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jsr PRODOS_MLI ; online
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.byte $c5
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.word $006e
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lda $0281
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L127C: ldy #$AF
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sty $0281
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and #$0F
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tay
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clc
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adc #$0E
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sta $0380
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adc #$74
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sta L10B9+1
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iny
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sty $57
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dey
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rts
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OPEN_FILE: lda $57
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sta OPEN_BUFFER
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jsr PRODOS_MLI ; open
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.byte $c8
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.word $0072
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bcs BB_EXIT
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lda $77
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sta $79
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sty $7D
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lda #$2B
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ldx #$0D
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.byte $2C ; mask next
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L12AC: lda #$27
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dex
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bne L12B5
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lda #$2C
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ldx #$0D
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L12B5: sta $7C
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jsr PRODOS_MLI ; read bytes from open file
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.byte $ca
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.word $0078
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iny
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beq BB_EXIT
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lsr $7E
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beq BB_EXIT
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tay
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lda ($7A),y
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and #$8F
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sta ($7A),y
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asl a
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beq L12AC
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ldy #$10
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lda ($7A),y
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ldy #$07
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L12D4: dey
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beq L12DC
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cmp L136E,y
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bne L12D4
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L12DC: tya
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asl a
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asl a
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asl a
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asl a
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ldy #$00
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ora ($7A),y
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sta ($7A),y
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lda $7A
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adc #$10
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sta $7A
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bcc L12AC
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inc $7B
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bne L12AC
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BB_EXIT: tay
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jsr PRODOS_MLI ; close all open files
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.byte $cc
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.word CLOSE_ALL
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rts
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; ProDOS MLI call parameters here
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CLOSE_ALL: .byte 1, 0 ; one parameter, no reference, so close all
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L12FD: .byte 1
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L12FE: .word OPEN_BUFFER
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L1300: .byte $ad, $16, $29
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scrcode "BITSY BYE"
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.byte $05, $24
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scrcode "BY"
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.byte $0a, $20
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scrcode "J.BROOKS"
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.byte $0f, $23
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scrcode "P.FERRIE"
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.byte $12, $23
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scrcode "RETURN:SELECT"
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.byte $17, $0d
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scrcode "ESC:BACK"
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.byte $17
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L134F: .byte $18 ; $18 is L134F
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scrcode "TAB,#:NEW VOL"
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.byte $17, $28
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L135F: scrcode "S6,D1:"
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.byte $00
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L1356: .byte $06
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L135q: scrcode "/BASIS.SYSTEM"
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.byte $02, $00, $81, $02, $03, $80, $02, $00, $0b, $00
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L136E: .byte $04, $FA, $06, $fc, $04
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.byte $B3
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.byte $FF
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L1375: .byte $a0, $c9, $c2, $c1, $d4, $ad, $ad
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