mirror of
https://github.com/a2-4am/4cade.git
synced 2024-06-03 07:29:30 +00:00
62 lines
1.1 KiB
Plaintext
62 lines
1.1 KiB
Plaintext
;license:MIT
|
|
;(c) 2019-2020 by qkumba
|
|
|
|
!cpu 6502
|
|
!to "build/PRELAUNCH.INDEXED/AZTEC",plain
|
|
*=$106
|
|
|
|
!source "src/prelaunch/common.a"
|
|
|
|
+ENABLE_ACCEL
|
|
lda #$60
|
|
sta $A00
|
|
jsr $800 ; find and load "DOS"
|
|
lda #<callback
|
|
sta $B748
|
|
lda #>callback
|
|
sta $B749
|
|
jmp $B700
|
|
|
|
keypress
|
|
lda $C000
|
|
bpl keypress
|
|
cmp #$8D
|
|
bne keypress
|
|
lda #$8D
|
|
rts
|
|
|
|
intercept
|
|
jsr $BD5F
|
|
jsr $BD09
|
|
lda $656B
|
|
cmp #$2C
|
|
clc
|
|
bne +
|
|
lda #$20
|
|
sta $656B
|
|
lda #<keypress
|
|
sta $656C
|
|
lda #>keypress
|
|
sta $656D
|
|
+ rts
|
|
|
|
callback
|
|
ldx #0
|
|
stx $9E52
|
|
inx
|
|
stx $9E53 ; reset vector patch
|
|
lda #$4C
|
|
sta $BD06
|
|
lda #<intercept
|
|
sta $BD07
|
|
lda #>intercept
|
|
sta $BD08
|
|
sta $656B
|
|
|
|
+DISABLE_ACCEL
|
|
jmp $9D84
|
|
|
|
!if * > $1C0 {
|
|
!error "code is too large, ends at ", *
|
|
}
|