add cheat for Spy's Demise

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 59 game cheats
+ - Added 60 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

src/prelaunch/pooyan.a

@@ -14,6 +14,7 @@
          +GET_MACHINE_STATUS
          and   #CHEATS_ENABLED
          beq   +
+                          ; lives in $0F82,X (X=0/1 for player 1/2)
          lda   #$BD
          sta   $7D7E      ; patch - don't decrease lives
          sta   $7D9A      ; patch - don't decrease lives

src/prelaunch/spys.demise.a

@@ -0,0 +1,23 @@
+;license:MIT
+;(c) 2019 by 4am
+
+!cpu 6502
+!to "build/PRELAUNCH/SPYS.DEMISE",plain
+*=$106
+
+         !source "src/prelaunch/common.a"
+
+         +ENABLE_ACCEL
+         lda   #$60
+         sta   $0853
+         jsr   $0800      ; decompress
+         +GET_MACHINE_STATUS
+         and   #CHEATS_ENABLED
+         beq   +
+                          ; lives in $17
+         lda   #$A5
+         sta   $6D8A      ; patch - don't decrease lives
+         sta   $6DD0      ; patch - don't increase lives
++
+         +DISABLE_ACCEL
+         jmp   $6000

src/prelaunch/twerps.a

@@ -23,6 +23,7 @@
 patch
          lda   #0         ; SMC
          beq   +
+                          ; lives in $14FE
          lda   #$AD
          sta   $0640      ; patch - don't decrease lives
          sta   $0774      ; patch - don't decrease lives