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add cheat for Threshold

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This commit is contained in:
4am 2019-10-11 12:21:35 -04:00
parent 65875d9028
commit a00c6b24de
3 changed files with 36 additions and 2 deletions
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2
res/games.conf
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File diff suppressed because one or more lines are too long

2
res/history.md
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@ -12,7 +12,7 @@
- Added help screen (press ? in search or browse mode to show)
- Added global cheat mode (press Ctrl-C in search or browse mode to toggle)
- Added 61 game cheats
- Added 62 game cheats
- Fixed corrupted graphics in Asteroid Blaster
- Fixed corrupted graphics in Sneakers game, demo, and screenshots, and now we are entirely done with this I promise
- Fixed Axis Assassin demo hanging on IIgs

34
src/prelaunch/threshold.a Normal file
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@ -0,0 +1,34 @@
;license:MIT
;(c) 2019 by 4am
!cpu 6502
!to "build/PRELAUNCH/THRESHOLD",plain
*=$106
!source "src/prelaunch/common.a"
+ENABLE_ACCEL
+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 $39F4
lda #$00
sta $39F5
jmp $0800 ; decompress
patch
lda #0 ; SMC
beq +
; lives in $778F
lda #$AD
sta $45B0 ; patch - don't decrease lives
sta $7ECD ; patch - don't increase lives
+
+DISABLE_ACCEL
jmp $6B00
end_patch