mirror of https://github.com/a2-4am/4cade.git
62 lines
1.3 KiB
Plaintext
62 lines
1.3 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/VIPER.PATROL",plain
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*=$106
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!source "src/prelaunch/common.a"
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lda #$4C
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sta $948E
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lda #<callback1
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sta $948F
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lda #>callback1
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sta $9490
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jmp $5200 ; load "DOS"
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callback1
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+ENABLE_ACCEL
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lda #0
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sta $56
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jsr $BDAC ; decompress
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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 $1B82
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cmp #$4C
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bne +
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lda #<callback2
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sta $1B83
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lda #>callback2
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sta $1B84
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lda #<callback3
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sta $1BCA
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lda #>callback3
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sta $1BCB
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+
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jsr DisableAccelerator
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+READ_ROM_NO_WRITE
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lda #0
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rts
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callback2
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lda #$A5
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sta $B7D ; patch - don't increase lives
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sta $B8B ; patch - don't decrease lives
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lda #$EA
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sta $C39 ; patch - don't decrease fuel
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bne +
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callback3
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dec $100C ; patch - don't increase lives
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dec $101A ; patch - don't decrease lives
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+ jmp $800
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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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