4cade/src/prelaunch/up.n.down.a

;license:MIT
;(c) 2019 by 4am

!cpu 6502
!to "build/PRELAUNCH/UP.N.DOWN",plain
*=$106

         !source "src/prelaunch/common.a"

         +GET_MACHINE_STATUS
         and   #CHEATS_ENABLED
         sta   patch+1
         ldx   #$0B       ; copy patch code to zero page (stack will be destroyed by the time we need to patch)
-        lda   patch,x
         sta   $F4,x
         dex
         bpl   -
         lda   #$F4       ; call patch instead of $200
         sta   $4061
         lda   #$00
         sta   $4062
         jmp   $2D2C
patch
         lda   #0         ; SMC
         beq   +
                          ; lives in $1B,X (X=0/1 for player 1/2)
         lda   #$B5
         sta   $0912      ; patch - don't decrease lives
+
         jmp   $0200      ; continue with load

!if * > $1C0 {
  !error "code is too large, ends at ", *
}