mirror of https://github.com/a2-4am/4cade.git
68 lines
1.5 KiB
Plaintext
Executable File
68 lines
1.5 KiB
Plaintext
Executable File
;license:MIT
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;(c) 2019-20 by qkumba/Frank M./Tom Greene
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!cpu 6502
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!to "build/PRELAUNCH.INDEXED/CW",plain
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*=$106
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!source "src/prelaunch/common.a"
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jmp main
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brunpatch
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lda $AA76 ; check second character of filename
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cmp #$C9 ; = I, filename = @INIT
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bne +
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ldx #$01 ; Patch it to return to TR
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stx $0DFF ; instead of exiting to BASIC
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inc $0D87 ; prevent language card detection
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+ cmp #$D7 ; = W, filename = @WOLF
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bne ++
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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 $1435 ; don't decrement bullets
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stx $18FE ; or grenades
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++ jmp ($AA72) ; finally jump to the loaded file
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patch
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!word brunpatch
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main
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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 $21D8
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jsr $2000 ; 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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ldx #$00
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stx $9E52
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inx
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stx $9E53
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lda #<patch ; intercept BRUN command before
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sta $A395 ; it jumps to the loaded file
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lda #>patch
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sta $A396
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+DISABLE_ACCEL
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jmp $9D84
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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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