mirror of https://github.com/a2-4am/4cade.git
74 lines
1.7 KiB
Plaintext
74 lines
1.7 KiB
Plaintext
;license:MIT
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;(c) 2020, 2022 by qkumba
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!cpu 6502
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!to "build/PRELAUNCH/SPIKES.CHEAT",plain
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*=$250
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!source "src/constants.a" ; no code in these
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!source "src/macros.a"
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+ENABLE_ACCEL
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lda #$60
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sta $99A
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sta $A15
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sta $A89
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sta $BE3
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jsr $900 ; decompress
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lda #<callback3
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sta $8B1
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lda #<callback1
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sta $9501
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lda #<callback2
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sta $95B1
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lda #>callback1
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sta $8B2
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sta $9502
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sta $95B2
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jmp $9500
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callback1
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+READ_RAM2_NO_WRITE
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jsr EnableAccelerator
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jsr $9503
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+DISABLE_ACCEL
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jsr $BC6C
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sta $C010
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callback2
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+READ_RAM2_NO_WRITE
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jsr EnableAccelerator
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jsr $BC7B
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+READ_RAM2_NO_WRITE
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lda MachineStatus
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and #CHEATS_ENABLED
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beq +
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lda #$ad
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sta $6AB0 ; patch - don't decrease fuel
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sta $6B5C ; patch - don't decrease lives
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+
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jsr DisableAccelerator
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+READ_ROM_NO_WRITE
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lda #$30
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jsr $FCA8 ; allow joystick timers to expire
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jmp $A00
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callback3
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+READ_RAM2_NO_WRITE
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jsr EnableAccelerator
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jsr $BE01
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+READ_RAM2_NO_WRITE
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lda MachineStatus
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and #CHEATS_ENABLED
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beq +
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lda #$ad
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sta $6D9B ; patch - don't decrease fuel
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sta $7EA0 ; patch - don't decrease lives
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sta $8AF1 ; patch - don't decrease lives
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+
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jsr DisableAccelerator
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+READ_ROM_NO_WRITE
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jmp $8D00
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