add cheat for Sammy Lightfoot

res/history.md

@@ -1,20 +1,25 @@
 # Revision 3 / unreleased
 
-## New games
+## New & changed games
 
- - Flight Simulator II (replaces Flight Simulator I)
+ - Added Flight Simulator II
- - Short Circuit
+ - Added Short Circuit
+ - Removed Flight Simulator I
+ - Combined Tetris 48K and Tetris 128K into one entry; just launch Tetris and it'll figure it out
 
 ## Enhancements & bug fixes
 
  - 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 52 game cheats
+ - Added 53 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
  - Added missing levels in Out Of This World
  - Removed latent copy protection in Sea Dragon (sneaky sneaky)
+ - Enable fast machine speed or accelerator (if available) to speed up searching, browsing, and game launching
  - Prevent flashes of other game screenshots while loading the game you actually want
+ - Detect VidHD in passive mode
  - Fixed a freeze on startup with certain accelerators
  - Fixed a crash on Apple ][+
  - Fixed launching from MicroDrive partition 3+

src/prelaunch/sammy.lightfoot.a

@@ -0,0 +1,25 @@
+;license:MIT
+;(c) 2019 by 4am
+
+!cpu 6502
+!to "build/PRELAUNCH/SAMMY.LIGHTFOOT",plain
+*=$106
+
+         !source "src/prelaunch/common.a"
+
+         +ENABLE_ACCEL
+         lda   #$60
+         sta   $4094
+         lda   #$FF
+         sta   $4206
+         jsr   $4000      ; decompress 1
+         jsr   $B7B5      ; decompress 2
+         +GET_MACHINE_STATUS
+         and   #CHEATS_ENABLED
+         beq   +
+         lda   #$AD
+         sta   $7B8B      ; patch - never decrease lives (player 1)
+         sta   $7B81      ; patch - never decrease lives (player 2)
++
+         +DISABLE_ACCEL
+         jmp   $B7A1