4cade/src/prelaunch/twerps.a

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2019-10-11 01:58:04 +00:00
;license:MIT
;(c) 2019 by 4am
!cpu 6502
!to "build/PRELAUNCH/TWERPS",plain
*=$106
!source "src/prelaunch/common.a"
+GET_MACHINE_STATUS
and #CHEATS_ENABLED
sta patch+1
ldx #(end_patch-patch-1) ; copy patch code to zero page (stack will be destroyed by the time we need to patch)
- lda patch,x
sta $100-end_patch+patch,x
dex
bpl -
lda #($100-end_patch+patch)
sta $1DF6
lda #$00
sta $1DF7
jmp $1D97 ; decompress and show title
patch
lda #0 ; SMC
beq +
lda #$AD
sta $0640 ; patch - don't decrease lives
sta $0774 ; patch - don't decrease lives
sta $0F05 ; patch - don't decrease lives
+
jmp $0400
end_patch