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add Ghostbusters cheat

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This commit is contained in:
Peter Ferrie 2022-05-23 10:22:00 -07:00
parent 154f5a32a5
commit 1c010f79a5
2 changed files with 18 additions and 3 deletions
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2
res/GAMES.CONF
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@ -182,7 +182,7 @@
0001,GENIUS=Genius 0001,GENIUS=Genius
0001,GENIUS.2=Genius 2 0001,GENIUS.2=Genius 2
0001,GENIUS.3=Genius 3 0001,GENIUS.3=Genius 3
1000,GHOSTBUSTERS=Ghostbusters 1006,GHOSTBUSTERS=Ghostbusters
0000,GLUTTON=Glutton 0000,GLUTTON=Glutton
0001,GOLD.RUSH=Gold Rush 0001,GOLD.RUSH=Gold Rush
0001,GORGON=Gorgon 0001,GORGON=Gorgon

19
src/prelaunch/ghostbusters.a
View File

@ -1,5 +1,5 @@
;license:MIT ;license:MIT
;(c) 2020 by qkumba ;(c) 2020, 2022 by qkumba
!cpu 6502 !cpu 6502
!to "build/PRELAUNCH.INDEXED/GHOSTBUSTERS",plain !to "build/PRELAUNCH.INDEXED/GHOSTBUSTERS",plain
@ -11,9 +11,24 @@
lda #$60 lda #$60
sta $4075 sta $4075
jsr $4000 ; decompress jsr $4000 ; decompress
+DISABLE_ACCEL +READ_RAM2_NO_WRITE
lda MachineStatus
and #CHEATS_ENABLED
beq +
lda #<callback
sta $914
lda #>callback
sta $915
+
jsr DisableAccelerator
+READ_ROM_NO_WRITE
jmp $800 jmp $800
callback
lda #0
sta $9D31 ; patch - disable sprite collision
jmp $9600
!if * > $1C0 { !if * > $1C0 {
!error "code is too large, ends at ", * !error "code is too large, ends at ", *
} }