This is the binary definition of ET’s sprite, in Atari’s infamous game: ETWalkSprite_A0 .byte $FE ; |XXXXXXX.| .byte $FF ; |XXXXXXXX| .byte $C3 ; |XX....XX| .byte $0F ; |....XXXX| .byte $FF ; |XXXXXXXX| .byte $3F ; |..XXXXXX| .byte $2B ; |..X.X.XX| .byte $E7 ; |XXX..XXX| .byte $00 ; |........| I am actually less disturbed by the 6502 listing than by this extra bit between ET’s legs (which you can see on the screen shot above).