mirror of https://github.com/a2-4am/4cade.git
59 lines
1.7 KiB
Plaintext
59 lines
1.7 KiB
Plaintext
;license:MIT
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;(c) 2019, 2024 by 4am/Frank M., qkumba
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!cpu 6502
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!to "build/PRELAUNCH.INDEXED/H.E.R.O",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 $4028
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jsr $4000 ; decompress
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ldx $FBB3
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cpx #6
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bne + ; not a //e or //c
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ldx $FBC0
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bne + ; not a //c
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lda $C405
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cmp #$38
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bne not_mouse
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lda $C407
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cmp #$18
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beq + ; looks like the mouse
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not_mouse
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lda #0
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sta $6032 ; disable mouse-based VBL
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+
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+GET_MACHINE_STATUS
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and #CHEATS_ENABLED
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beq +
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; lives in $28 (capped at 6)
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; bombs in $29
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lda #$A5
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sta $6387 ; patch - don't decrease lives after dying
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lda #$2C
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sta $717E ; patch - don't call routine that decreases bombs after planting one
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; (routine needs to decrease bombs because it's called at the end of each level
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; to give you a bonus for each bomb left, so instead we patch one caller but
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; not the other so you can plant a bomb without using up a bomb then get the
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; maximum 'unused bombs' bonus and advance to the next level)
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+
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lda #3
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sta $6040
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lda #$A6
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sta $6041 ; reset vector cloned from $603F
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; $100 gets trashed so put it at $300
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+NEW_RESET_VECTOR $300
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+DISABLE_ACCEL
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jmp $6000
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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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