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https://github.com/a2-4am/4cade.git
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54 lines
1.2 KiB
Plaintext
54 lines
1.2 KiB
Plaintext
;license:MIT
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;(c) 2020, 2022 by Frank M., qkumba
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!cpu 6502
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!to "build/PRELAUNCH.INDEXED/NI",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 $404B
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jsr $4000 ; decompress
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lda #<callback ; lets fix ROM calls to WAIT/$FCA8
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sta $16A9 ; which behave differently
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sta $80EE ; on different machines
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sta $8799 ; (fixes slow scream on //c+ & //gs)
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sta $8C8F
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sta $8CC4
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sta $8CE1
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lda #>callback
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sta $16AA
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sta $80EF
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sta $879A
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sta $8C90
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sta $8CC5
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sta $8CE2
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+READ_RAM2_NO_WRITE
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lda MachineStatus
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and #CHEATS_ENABLED
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beq +
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lda #$AD
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sta $8718 ; patch - don't decrease lives
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sta $8980 ; patch - don't increase lives
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+
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jsr DisableAccelerator
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+READ_ROM_NO_WRITE
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jmp $1206
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callback sec ; non-ROM WAIT
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wait2 pha
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wait3 sbc #$01
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bne wait3
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pla
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sbc #$01
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bne wait2
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rts
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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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