mirror of https://github.com/a2-4am/4cade.git
69 lines
1.6 KiB
Plaintext
69 lines
1.6 KiB
Plaintext
;license:MIT
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;(c) 2021-2022 by Frank M., qkumba
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!cpu 6502
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!to "build/PRELAUNCH.INDEXED/APPLE.INVADER",plain
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*=$106
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!source "src/prelaunch/common.a"
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lda $7fe
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pha
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+ENABLE_ACCEL
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pla
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sta $7fe ; overwritten by GS acceleration
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lda #$60
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sta $6020
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jsr $6002 ; decompress
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lda #$30 ; fix sound on //gs
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sta $1A35 ; enemy destruct
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sta $1D9E ; player destruct
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sta $1C36 ; bonus ship
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sta $1CCB ; kill bonus ship
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lda #$D8 ; move location from $3F2 to $3D8
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sta $1113 ; (program uses reset vector for storage)
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sta $1245
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sta $4A2C
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sta $4A34
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sta $4A41
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sta $5A9C
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sta $5AA4
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sta $5AB1
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sta $5A9C
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lda #$D9 ; move location from $3F3 to $3D9
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sta $1FA0
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sta $4A31
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sta $4F4D
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sta $5AA1
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lda #$DA ; move location from $3F4 to $3DA
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sta $11AF
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sta $1824
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sta $19DF
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sta $1DE8
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sta $1E5A
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+READ_RAM2_NO_WRITE
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lda MachineStatus
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and #CHEATS_ENABLED
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beq +
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lda #$A5
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sta $1997 ; patch - don't increase lives
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sta $1E33 ; patch - don't decrease lives
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+
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lda $7fe
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pha
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jsr DisableAccelerator
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+READ_ROM_NO_WRITE
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pla
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sta $7fe ; overwritten by GS acceleration
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jmp $5F00
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!if * > $1C1 {
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!error "code is too large, ends at ", *
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}
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