Character_generator_ROM = $D000
        Y_pos_offset = $F9    ; 16-bit value (uses F8), reuses from Y_pos
        X_pos_offset = $FA    ; 16-bit value (uses F7)
        X_pos = $FA
        Y_pos = $F9
        charset = $FB
        code = $FE
        petski_position = $FE ; 16-bit value (uses FF),reuses code:s memory
        screen_position = $FC ; 16-bit value (uses FD)
        ;; copy
        VIC_bank = $4000