mirror of
https://github.com/mach-kernel/mrbuffer.git
synced 2024-06-16 20:29:31 +00:00
168 lines
3.2 KiB
ArmAsm
168 lines
3.2 KiB
ArmAsm
rel
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typ $B3
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dsk main.l
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; ensure 16-bit mode (unnecessary?)
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clc
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xce
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rep #$30
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phk
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plb
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; half bank for accumulator, you don't want to toggle them on then back off, right?
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sep #$30
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; toggle the softswitches; they don't take any values. some are only triggered
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; by writes, $C054 can be triggered by a read
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stal $00C000 ; disable 80 column store?
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stal $00C00C ; disable 80 column hardware?!
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stal $00C050 ; set standard apple ii gfx mode
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stal $00C051 ; select text mode only. "only"?
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ldal $00C054 ; select text page 1 (there are 2)
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ldal $00C056 ; select "low res" graphics
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rep #$30
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sep #$20
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; show the current char on screen
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; read keyboard then hit strobe to reset
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ldx #0
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ldal $00C010
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:kloop clc
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ldal $00C000
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bit #%1
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bmi :kjump
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jmp :kloop
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:kjump jsr keydown
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jmp :kloop
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keydown nop
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cmp #$8B ; up
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beq up
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cmp #$8A ; down
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beq down
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cmp #$88 ; left
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beq left
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cmp #$95 ; right
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beq right
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cmp #$FF ; backspace
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beq backspace
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cmp #$8D ; return
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beq down
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jmp dispchar
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backspace clc
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cpx #0
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bne :drop
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jmp :out
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:drop dex
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:out lda #$A0
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stal $000400,X
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jmp rtsout
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up clc
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phy
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ldy #0
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jsr updown
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ply
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jmp rtsout
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down clc
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phy
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ldy #1
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jsr updown
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ply
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jmp rtsout
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updown clc
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cpx #1488
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beq rtsout
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rep #$30
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pha
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txa
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cpy #0
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beq :ldown
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bne :lup
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:lup adc #128
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jmp :lcont
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:ldown sbc #128
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:lcont tax
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pla
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sep #$20
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jmp rtsout
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left clc
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cpx #0
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beq rtsout
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dex
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jmp rtsout
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right clc
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cpx #39
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beq rtsout
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inx
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jmp rtsout
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dispchar stal $000400,X
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inx
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jmp rtsout
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rtsout ldal $00C010
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lda #0
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rts
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; working text blit
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* ldx #hithere+2 ; strl, first two bytes are strlen, # denotes immediate addr val
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* ldy #$0400 ; start of text buffer on 00
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* ldal hithere
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* dec
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* mvn $02, $00
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* brk
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; Important locations
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SPEAKER equ $E0C030
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PRODOS16 equ $E100A8
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jsl PRODOS16
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; This exit code is "device busy", why is it the only one
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; that works?!
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da $29
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adrl QP
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bcs ERROR
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ERROR brk
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QP adrl $0000
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da $00
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hithere strl "this was excruciating"
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brkboi brk
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