Quit to TR and add cheat for Castle Smurfenstein (#169)

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Tom Greene 2020-04-27 10:22:14 -04:00 committed by GitHub
parent a78e1d16b5
commit f3abc8731e
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2 changed files with 35 additions and 6 deletions

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@ -44,7 +44,7 @@
0001,CANNONBALL.BLTZ=Cannonball Blitz 0001,CANNONBALL.BLTZ=Cannonball Blitz
0001,CANYON.CLIMBER 0001,CANYON.CLIMBER
0000,CAPTN.GOODNIGHT=Captain Goodnight 0000,CAPTN.GOODNIGHT=Captain Goodnight
0000,SMURFEN=Castle Smurfenstein 0002,SMURFEN=Castle Smurfenstein
0002,WOLFEN84=Castle Wolfenstein 0002,WOLFEN84=Castle Wolfenstein
1001,CAVRNS.CALLISTO=Caverns of Callisto 1001,CAVRNS.CALLISTO=Caverns of Callisto
1001,CEILING.ZERO 1001,CEILING.ZERO

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@ -1,5 +1,5 @@
;license:MIT ;license:MIT
;(c) 2020 by qkumba/Frank M. ;(c) 2020 by qkumba/Frank M./Tom Greene
!cpu 6502 !cpu 6502
!to "build/PRELAUNCH/SMURFEN",plain !to "build/PRELAUNCH/SMURFEN",plain
@ -19,18 +19,47 @@
jmp $B700 jmp $B700
callback callback
+READ_RAM2_WRITE_RAM2
lda #0 lda #0
sta $9E52 sta $9E52
sta $FFFC
lda #1 lda #1
sta $9E53 sta $9E53
sta $FFFD ; reset vector patch
+READ_ROM_NO_WRITE lda #$00 ; intercept BRUN command before
sta $A395 ; it jumps to the loaded file
lda #$03
sta $A396
ldx #patchend-patch
- lda patch,x ; The game code has a stack leak and will
sta $0300,x ; clobber all of page 1 after repeated plays
dex ; so move the patch code to page 3
bpl -
+DISABLE_ACCEL +DISABLE_ACCEL
jmp $9B00 jmp $9B00
patch
!word $0302
lda $AA76 ; check second character of filename
cmp #$D7 ; = W, filename = @WOLF
bne +
ldx #$01 ; Patch it to return to TR
stx $1EFA ; instead of exiting to BASIC
+GET_MACHINE_STATUS
and #CHEATS_ENABLED
beq +
ldx #$03
stx $4048 ; start with 3 grenades
ldx #$2C
stx $14AD ; don't decrement bullets
stx $1999 ; or grenades
+ jmp ($AA72) ; finally jump to the loaded file
patchend
!if * > $1C0 { !if * > $1C0 {
!error "code is too large, ends at ", * !error "code is too large, ends at ", *
} }