add Caverns of Callisto to the collection

res/GAMES.CONF

@@ -45,6 +45,7 @@
 0000,CAPTN.GOODNIGHT=Captain Goodnight
 0000,SMURFEN=Castle Smurfenstein
 0000,WOLFEN84=Castle Wolfenstein
+1001,CAVRNS.CALLISTO=Caverns of Callisto
 1001,CEILING.ZERO
 0001,CENTIPEDE
 0001,CHAMP.LODERUN=Championship Lode Runner

res/TITLE.HGR/_FileInformation.txt

@@ -40,6 +40,7 @@ BUZZARD.BAIT=Type(06),AuxType(4000),Access(C3)
 CANNONBALL.BLTZ=Type(06),AuxType(4000),Access(C3)
 CANYON.CLIMBER=Type(06),AuxType(4000),Access(C3)
 CAPTN.GOODNIGHT=Type(06),AuxType(4000),Access(C3)
+CAVRNS.CALLISTO=Type(06),AuxType(4000),Access(C3)
 CEILING.ZERO=Type(06),AuxType(4000),Access(C3)
 CENTIPEDE=Type(06),AuxType(4000),Access(C3)
 CHAMP.LODERUN=Type(06),AuxType(4000),Access(C3)

res/history.md

@@ -8,6 +8,7 @@
  - Bejeweled
  - California Games
  - Castle Smurfenstein
+ - Caverns of Callisto
  - Columns
  - Congo Bongo
  - Crystal Castles

res/notes/wishlist.txt

@@ -66,7 +66,6 @@ Beach-Head
 Beach-Head II
 Boa
 Borg
-Caverns of Callisto [priority]
 Copts and Robbers
 The Dam Busters
 Fight Night

src/prelaunch/cavrns.callisto.a

@@ -0,0 +1,33 @@
+;license:MIT
+;(c) 2020 by qkumba
+
+!cpu 6502
+!to "build/PRELAUNCH/CAVRNS.CALLISTO",plain
+*=$106
+
+    !source "src/prelaunch/common.a"
+
+         +ENABLE_ACCEL
+         lda   #>callback
+         sta   $8D9
+         lda   #<callback
+         sta   $8D8
+         jmp   $800       ; decompress
+
+callback
+         +GET_MACHINE_STATUS
+         and   #CHEATS_ENABLED
+         beq   +
+         lda   $BFC
+         cmp   #$C6
+         bne   +
+         lda   #$A5
+         sta   $BFC       ; patch - don't decrease lives
++
+         jsr   $BD82
+         +DISABLE_ACCEL
+         rts
+
+!if * > $1C0 {
+  !error "code is too large, ends at ", *
+}