4cade/src/prelaunch/flapple.bird.a

;license:MIT
;(c) 2020, 2022 by Frank M., qkumba

!cpu 6502
!to "build/PRELAUNCH.INDEXED/FLAPPLE.BIRD",plain
*=$106

    !source "src/prelaunch/common.a"

         +READ_RAM2_NO_WRITE
         jsr   EnableAccelerator
         lda   #$60
         sta   $813
         jsr   $800
         +READ_RAM1_NO_WRITE
         lda   WaitForVBL
         eor   #$60
         bne   @good_vbl  ; if VBL disabled in TR
         sta   $2971      ; then disable VBL in game

@good_vbl
         +DISABLE_ACCEL
         jmp   $2000

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