Quit to TR and add cheat for Castle Wolfenstein (#166)

res/GAMES.CONF

@@ -45,7 +45,7 @@
 0001,CANYON.CLIMBER
 0000,CAPTN.GOODNIGHT=Captain Goodnight
 0000,SMURFEN=Castle Smurfenstein
-0000,WOLFEN84=Castle Wolfenstein
+0002,WOLFEN84=Castle Wolfenstein
 1001,CAVRNS.CALLISTO=Caverns of Callisto
 1001,CEILING.ZERO
 0001,CENTIPEDE

src/prelaunch/wolfen84.a

@@ -1,5 +1,5 @@
 ;license:MIT
-;(c) 2019 by qkumba/Frank M.
+;(c) 2019-20 by qkumba/Frank M./Tom Greene
 
 !cpu 6502
 !to "build/PRELAUNCH/WOLFEN84",plain
@@ -18,23 +18,47 @@
          sta   $B749
          jmp   $B700
 
-reset
-         +READ_ROM_NO_WRITE
-         jmp   $FAA6
-
 callback
-         +READ_RAM2_WRITE_RAM2
-         lda   #<reset
+         lda   #$00
          sta   $9E52
-         sta   $FFFC
-         lda   #>reset
+         lda   #$01
          sta   $9E53
-         sta   $FFFD       ; reset vector patch
-         +READ_ROM_NO_WRITE
+
+         lda   #<patch    ; intercept BRUN command before
+         sta   $A395      ; it jumps to the loaded file
+         lda   #>patch
+         sta   $A396
 
          +DISABLE_ACCEL
          jmp   $9D84
 
+patch
+         !word brunpatch
+
+brunpatch
+         lda   $AA76      ; check second character of filename
+         cmp   #$C9       ; = I, filename = @INIT
+         bne   +         
+
+         ldx   #$01       ; Patch it to return to TR
+         stx   $0DFF      ; instead of exiting to BASIC
+
+         inc   $0D87      ; prevent language card detection
+
++        cmp   #$D7       ; = W, filename = @WOLF
+         bne   ++
+
+         +GET_MACHINE_STATUS
+         and   #CHEATS_ENABLED
+         beq   ++
+         ldx   #$03
+         stx   $4048      ; start with 3 grenades
+         ldx   #$2C
+         stx   $1435      ; don't decrement bullets
+         stx   $18FE      ; or grenades
+
+++       jmp   ($AA72)    ; finally jump to the loaded file
+
 !if * > $1C0 {
   !error "code is too large, ends at ", *
 }