Roland D-50 synthesizer EPROM with OS Version Firmware 1.10

You're watching an EPROM withOS 1.10 for the Roland D-50 synthesizer. This is for the earlier version - you simply use this if your EPROM already is 1.04, 1.05, 1.06 or 1.07or check that the processor mask ROM is version 17 (uPD-78312G-017).