lda #%10000000 sta $8000 ; Resetting range #0 sta $A000 ; Resetting range #1 sta $C000 ; Resetting range #2 sta $E000 ; Resetting range #3 lda #$0C ; This is our value sta $EFD9 ; Writing bit 0 lsr a ; Shifting sta $EFD9 ; Writing bit 1 lsr a ; Shifting sta $EFD9 ; Writing bit 2 lsr a ; Shifting sta $EFD9 ; Writing bit 3 lsr a ; Shifting sta $EFD9 ; Writing bit 4