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62 lines
1.1 KiB
Plaintext
62 lines
1.1 KiB
Plaintext
;license:MIT
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;(c) 2019-2020 by qkumba
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!cpu 6502
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!to "build/PRELAUNCH.INDEXED/AZTEC",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 $A00
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jsr $800 ; find and load "DOS"
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lda #<callback
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sta $B748
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lda #>callback
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sta $B749
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jmp $B700
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keypress
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lda $C000
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bpl keypress
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cmp #$8D
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bne keypress
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lda #$8D
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rts
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intercept
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jsr $BD5F
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jsr $BD09
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lda $656B
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cmp #$2C
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clc
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bne +
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lda #$20
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sta $656B
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lda #<keypress
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sta $656C
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lda #>keypress
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sta $656D
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+ rts
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callback
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ldx #0
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stx $9E52
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inx
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stx $9E53 ; reset vector patch
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lda #$4C
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sta $BD06
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lda #<intercept
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sta $BD07
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lda #>intercept
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sta $BD08
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sta $656B
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+DISABLE_ACCEL
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jmp $9D84
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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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