On sprites (or any data) we want to show a 8x8 block (all pixels colored in) block: .db 255,255,255,255,255,255,255,255 is the same as block: .db %11111111,%11111111,%11111111,%11111111,%11111111,%11111111,%11111111,%11111111 or block: .db 11111111b,11111111b,11111111b,11111111b,11111111b,11111111b,11111111b,11111111b or block: .db $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF OR... block: .dw $FFFF,$FFFF,$FFFF,$FFFF