lorom org $90BBA1 ;original code JSR $F650 ;jump to free space org $90F650 ;free space coding LDA $0A4c ADC #$0100 STA $0A4c LDA $09C2 ADC #$0000 CMP $09C4 BCC Here LDA $09c4 Here: STA $09C2 RTS LDA $0CD0 ;original code that was replaced JSR $BBA4 ;jump back to original code stuffs