screenfill.asm

; Fills the screen at the end of the snake game demonstrated at https://skilldrick.github.io/easy6502/
; I could have patched the MSB of the STA instruction's address but this works and there's no delay between blocks

gameOver:
  ldx #0
fillLoop1:
  lda sysRandom
  sta $0200, x
  inx
  bne fillLoop1 ; if Z=0 (inx did not wrap around), then keep filling
fillLoop2:
  lda sysRandom
  sta $0300, x
  inx
  bne fillLoop2
fillLoop3:
  lda sysRandom
  sta $0400, x
  inx
  bne fillLoop3
fillLoop4:
  lda sysRandom
  sta $0500, x
  inx
  bne fillLoop4
end:
  jmp gameOver ; keep filling