;license:MIT
;(c) 2021 by Frank M.

!cpu 6502
!to "res/DEMO/SPACE.EGGS",plain
*=$300

         !source "src/constants.a"   ; no code in these
         !source "src/macros.a"

         +GAME_REQUIRES_JOYSTICK
         +READ_RAM2_WRITE_RAM2
         jsr   EnableAccelerator
         +LOAD_FILE_AT title, $00

         +NEW_RESET_VECTOR $280

         lda   #$60
         sta   $2056
         jsr   $2000      ; decompress

         lda   #$EA
         sta   $4821
         sta   $4821+1
         sta   $4821+2
         sta   $4821+3
         sta   $4821+4
         sta   $4821+5    ; avoid clobbering stack

         lda   #$AD
         sta   $4B00
         lda   #0
         sta   $4B00+1
         lda   #$C0
         sta   $4B00+2    ; change button press detection to keypress detection


         lda   #$4C
         sta   $4B06
         lda   #0
         sta   $4B06+1
         lda   #1
         sta   $4B06+2    ; exit on keypress

         ldx   #11-1
-        lda   patch, x
         sta   $4BD6, x
         dex
         bpl   -          ; decrement custom counter after demo cycle and eventually exit

         lda   #$02
         sta   $4BFF      ; initialize custom counter

         +DISABLE_ACCEL

         jmp   $4880

patch    !byte $CE,$FF,$4B,$10,$03,$4C,$00,$01,$4C,$B0,$4B

title    !byte x_e-x_b
x_b      !text "X/SPACE.EGGS/SPACE.EGGS"
x_e

!if * > $3F0 {
  !error "code is too large, ends at ", *
}