lorom org $8Fxxxx ;free space in bank $8F; offset 7xxxx PHP SEP #$20 LDA #$00 ;load red scroll to... STA $7ECDxx ;screen xx-20 STA $7ECDxx ;screen xx-20 STA $7ECDxx ;screen xx-20 STA $7ECDxx ;screen xx-20 STA $7ECDxx ;screen xx-20 LDA #$01 ;load blue scroll to... STA $7ECDxx ;screen xx-20 STA $7ECDxx ;screen xx-20 STA $7ECDxx ;screen xx-20 STA $7ECDxx ;screen xx-20 STA $7ECDxx ;screen xx-20 LDA #$02 ;load green scroll to... STA $7ECDxx ;screen xx-20 STA $7ECDxx ;screen xx-20 STA $7ECDxx ;screen xx-20 STA $7ECDxx ;screen xx-20 STA $7ECDxx ;screen xx-20 PLP ;End of door scroll ASM RTS ;End of door scroll ASM ;so for screen $04, you'd have STA $7ECD24 ;for screen $1A, you'd have STA $7ECD3A ;comment (add ; at the start) of any lines you don't need, and save this file as a copy (leaving the template untouched) with the same name as your rom.