mirror of https://github.com/a2-4am/4cade.git
77 lines
1.6 KiB
Plaintext
Executable File
77 lines
1.6 KiB
Plaintext
Executable File
;license:MIT
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;(c) 2019-2022 by qkumba/Frank M.
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!cpu 6502
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!to "build/PRELAUNCH.INDEXED/SKYFOX",plain
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*=$106
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!source "src/prelaunch/common.a"
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jmp +
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callback2
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jsr $BC03
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lda #$85
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ldx #$A5
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cmp $7FB5
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bne plane
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stx $7FB5 ; patch - don't increase damage
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stx $9327 ; patch - don't decrease fuel
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plane
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cmp $9BC7
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bne nopatch
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stx $156A ; patch - don't decrease fuel
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stx $9281 ; patch - don't decrease fuel
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stx $9BC7 ; patch - don't increase damage
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callback1
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sec
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sbc #8
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cmp #2
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nopatch
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lda #0
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rts
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+
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+ENABLE_ACCEL
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inc $80 ; requires a non-zero value for the RNG
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lda #$60
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sta $7E3A
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jsr $4635
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ldx #$82 ; READ_ROM_NO_WRITE
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stx $101
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ldx #$A6
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stx $104
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ldx #$FA
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stx $105 ; update TR hook to reboot
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sta $5FFC
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sty $5FFD ; moved to LC $FFFC/D
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lda #$4C
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sta $6872
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lda #<callback1
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sta $6873
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sty $6874
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lda #$B0
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sta $685B
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lda #$90
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sta $6862
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+READ_RAM2_NO_WRITE
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lda MachineStatus
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and #CHEATS_ENABLED
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beq +
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lda #<callback2
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sta $8882
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sty $8883
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+
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jsr DisableAccelerator
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+READ_ROM_NO_WRITE
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jmp $67BD
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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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