mirror of
https://github.com/mach-kernel/mrbuffer.git
synced 2024-06-02 04:41:31 +00:00
250 lines
2.5 KiB
ArmAsm
250 lines
2.5 KiB
ArmAsm
rel
|
|
typ $B3
|
|
dsk main.l
|
|
|
|
; ensure 16-bit mode (unnecessary?)
|
|
clc
|
|
xce
|
|
rep #$20
|
|
|
|
phk
|
|
plb
|
|
|
|
; half bank for accumulator, you don't want to toggle them on then back off, right?
|
|
sep #$30
|
|
|
|
; toggle the softswitches; they don't take any values. some are only triggered
|
|
; by writes, $C054 can be triggered by a read
|
|
stal $00C000 ; disable 80 column store?
|
|
|
|
stal $00C00C ; disable 80 column hardware?!
|
|
stal $00C050 ; set standard apple ii gfx mode
|
|
stal $00C051 ; select text mode only. "only"?
|
|
ldal $00C054 ; select text page 1 (there are 2)
|
|
ldal $00C056 ; select "low res" graphics
|
|
|
|
* rep #$30
|
|
|
|
; show the current char on screen
|
|
; read keyboard then hit strobe to reset
|
|
|
|
ldx #0
|
|
ldal $00C010
|
|
|
|
inloop clc
|
|
ldal $00C000
|
|
bit #%1
|
|
bmi keybranch
|
|
jmp inloop
|
|
keybranch jsr keydown
|
|
jmp inloop
|
|
|
|
keydown nop
|
|
cmp #$8B ; up
|
|
beq up
|
|
cmp #$8A ; down
|
|
beq down
|
|
cmp #$88 ; left
|
|
beq left
|
|
cmp #$95 ; right
|
|
beq right
|
|
jmp dispchar
|
|
|
|
up nop
|
|
jmp rtsout
|
|
down nop
|
|
jmp rtsout
|
|
|
|
left clc
|
|
cpx #0
|
|
beq rtsout
|
|
dex
|
|
jmp rtsout
|
|
|
|
right clc
|
|
cpx #39
|
|
beq rtsout
|
|
inx
|
|
jmp rtsout
|
|
|
|
dispchar stal $000400,X
|
|
jmp rtsout
|
|
|
|
rtsout ldal $00C010
|
|
lda #0
|
|
rts
|
|
|
|
; working text blit
|
|
* ldx #hithere+2 ; strl, first two bytes are strlen, # denotes immediate addr val
|
|
* ldy #$0400 ; start of text buffer on 00
|
|
* ldal hithere
|
|
* dec
|
|
|
|
* mvn $02, $00
|
|
* brk
|
|
|
|
; Important locations
|
|
SPEAKER equ $E0C030
|
|
PRODOS16 equ $E100A8
|
|
|
|
|
|
jsl PRODOS16
|
|
|
|
; This exit code is "device busy", why is it the only one
|
|
; that works?!
|
|
|
|
da $29
|
|
adrl QP
|
|
bcs ERROR
|
|
|
|
ERROR brk
|
|
|
|
QP adrl $0000
|
|
da $00
|
|
|
|
hithere strl "this was excruciating"
|
|
brkboi brk
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|