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