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66 lines
1.6 KiB
Plaintext
66 lines
1.6 KiB
Plaintext
;license:MIT
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;(c) 2020 by qkumba/Frank M./Tom Greene
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!cpu 6502
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!to "build/PRELAUNCH/SMURFEN",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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+USES_TEXT_PAGE_2
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lda #$60
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sta $A0B
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jsr $800 ; find and load "DOS"
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lda #<callback
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sta $B748
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lda #>callback
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sta $B749
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jmp $B700
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callback
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lda #0
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sta $9E52
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lda #1
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sta $9E53
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lda #$00 ; intercept BRUN command before
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sta $A395 ; it jumps to the loaded file
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lda #$03
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sta $A396
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ldx #patchend-patch
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- lda patch,x ; The game code has a stack leak and will
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sta $0300,x ; clobber all of page 1 after repeated plays
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dex ; so move the patch code to page 3
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bpl -
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+DISABLE_ACCEL
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jmp $9B00
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patch
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!word $0302
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lda $AA76 ; check second character of filename
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cmp #$D7 ; = W, filename = @WOLF
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bne +
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ldx #$01 ; Patch it to return to TR
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stx $1EFA ; instead of exiting to BASIC
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+GET_MACHINE_STATUS
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and #CHEATS_ENABLED
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beq +
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ldx #$03
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stx $4048 ; start with 3 grenades
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ldx #$2C
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stx $14AD ; don't decrement bullets
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stx $1999 ; or grenades
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+ jmp ($AA72) ; finally jump to the loaded file
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patchend
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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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