add cheat for Lode Runner

res/history.md

@@ -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 64 game cheats
+ - Added 65 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 Apple IIgs

src/prelaunch/lode.runner.a

@@ -0,0 +1,24 @@
+;license:MIT
+;(c) 2019 by 4am
+
+!cpu 6502
+!to "build/PRELAUNCH/LODE.RUNNER",plain
+*=$106
+
+         !source "src/prelaunch/common.a"
+
+         +ENABLE_ACCEL
+         lda   #$60
+         sta   $1F4E
+         jsr   $1F00      ; decompress
+         +GET_MACHINE_STATUS
+         and   #CHEATS_ENABLED
+         beq   +
+                          ; lives in $98, capped at 255
+         lda   #$FF
+         sta   $606F      ; start with 255 lives
+         lda   #$A5
+         sta   $613F      ; patch - don't decrease lives
++
+         +DISABLE_ACCEL
+         jmp   $9050