cheat for Matterhorn Screamer (#141)

res/GAMES.CONF

@@ -125,7 +125,7 @@
 1100,MARBLE.MADNESS
 0001,MARIO.BROS=Mario Bros.
 1001,MATING.ZONE
-0110,MATTERHORN=Matterhorn Screamer
+0111,MATTERHORN=Matterhorn Screamer
 1000,MINER.2049ER
 1001,MINER.2049.II=Miner 2049er II
 1001,MINGS.CHALLENGE=Ming's Challenge

src/prelaunch/matterhorn.a

@@ -0,0 +1,20 @@
+;license:MIT
+;(c) 2020 by Tom Greene
+
+!cpu 6502
+!to "build/PRELAUNCH/MATTERHORN",plain
+*=$106
+
+    !source "src/prelaunch/common.a"
+
+
+           +GET_MACHINE_STATUS
+           and   #CHEATS_ENABLED
+           beq   +
+           lda   #$2C
+           sta   $5255      ; do not decrement lives
++          jmp   $2000
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}