mirror of https://github.com/a2-4am/4cade.git
71 lines
1.4 KiB
Plaintext
71 lines
1.4 KiB
Plaintext
;license:MIT
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;(c) 2022 by qkumba, Frank M.
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!cpu 6502
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!to "build/PRELAUNCH.INDEXED/PP",plain
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*=$106
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!source "src/prelaunch/common.a"
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inc $3F4 ; force reboot on reset
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+READ_RAM2_NO_WRITE
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jsr EnableAccelerator
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lda MachineStatus
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and #CHEATS_ENABLED
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sta cheat_smc1+1
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sta cheat_smc2+1
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lda WaitForVBL
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cmp #$60
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php
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+READ_ROM_NO_WRITE
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lda #$60
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sta $13B8
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jsr $1200 ; decompress
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lda #<callback1
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sta $FE06
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lda #<callback2
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sta $FD26
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lda #>callback1
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sta $FE07
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sta $FD27
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plp
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bne @good_vbl
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ldx #<callback3
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stx $FD6A
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sta $FD6B
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@good_vbl
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jmp $EE00
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callback1
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cheat_smc1
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lda #0
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beq +
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dec $2D0E ; patch - don't decrease time
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+
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+READ_RAM2_NO_WRITE
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jsr DisableAccelerator
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+READ_RAM1_WRITE_RAM1
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jmp $4906
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callback2
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jsr $FF24
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cheat_smc2
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lda #0
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beq +
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lda #$a5
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sta $2612 ; patch - don't decrease lives
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+
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rts
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callback3
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lda #$60 ; if VBL disabled in TR
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sta $4ED ; then disable VBL in game
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jmp $F924
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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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