mirror of https://github.com/a2-4am/4cade.git
70 lines
1.3 KiB
Plaintext
70 lines
1.3 KiB
Plaintext
;license:MIT
|
|
;(c) 2022 by qkumba
|
|
|
|
!cpu 6502
|
|
!to "build/PRELAUNCH.INDEXED/CQ",plain
|
|
*=$106
|
|
|
|
!source "src/prelaunch/common.a"
|
|
|
|
+ENABLE_ACCEL
|
|
lda #$60
|
|
sta $A37
|
|
jsr $800 ; find and load "DOS"
|
|
lda #<callback1
|
|
sta $B748
|
|
lda #>callback1
|
|
sta $B749
|
|
jmp $B700
|
|
|
|
callback1
|
|
ldx #$00
|
|
stx $9E52
|
|
inx
|
|
stx $9E53 ; fix reset vector
|
|
|
|
lda #<callback2
|
|
sta $BD07
|
|
lda #>callback2
|
|
sta $BD08
|
|
+DISABLE_ACCEL
|
|
jmp $9D84
|
|
|
|
callback2
|
|
pla
|
|
pla
|
|
jsr $BD5A
|
|
jsr $BD09
|
|
lda $BE9F
|
|
sta $49
|
|
lda $BE9E
|
|
sta $48
|
|
ldy #4
|
|
lda ($48),y
|
|
tax
|
|
iny
|
|
lda ($48),y
|
|
ldy #1
|
|
cpx #$13
|
|
bne +
|
|
cmp #$0E
|
|
bne ++
|
|
sty $985D
|
|
sty $987A ; fix reset vector
|
|
+ cpx #6
|
|
bne ++
|
|
cmp #$0D
|
|
bne +++
|
|
sty $400E ; fix reset vector
|
|
+++ cmp #6
|
|
bne ++
|
|
sty $47B6
|
|
dey
|
|
sty $47B1 ; fix reset vector
|
|
++ clc
|
|
rts
|
|
|
|
!if * > $1C0 {
|
|
!error "code is too large, ends at ", *
|
|
}
|