This is the factory firmware and is the firmware, which was installed in your device, when it came from Roalnds factory. This operation system requires one eprom chip and the chip will be labeled to help you locate the correct chip socket. For more info, please check below.
The original factory OS, which featured in the original device and expanded eprom lifespan.
Many end-users may experience that their boot room on the mainboard gone corrupted. Replacing the old boot room can fix a corrupted one and bringing your TR-707 back from the dead. A corrupt boot rom will prevent you for being able to boot your device
The purpose of this boot rom eprom is to help the end-user restoring, maintaining or repairing their device.