mirror of https://github.com/a2-4am/4cade.git
67 lines
1.4 KiB
Plaintext
67 lines
1.4 KiB
Plaintext
;license:MIT
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;(c) 2019-2020 by qkumba/Tom Greene
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!cpu 6502
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!to "build/PRELAUNCH.INDEXED/BW",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 #$00 ; Patch it to return to TR
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stx $0DB4 ; instead of exiting to BASIC
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inx
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stx $0DB5
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inc $0C85 ; prevent language card detection
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+ cmp #$C6 ; = F, filename = @FHR
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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 #$2C
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stx $15AE ; don't decrement bullets
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++ jmp ($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 $97C
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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 #$01
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sta $9E31
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lda #$00
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sta $9E3C ; reset vector patch
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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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