You're watching a ROM B EPROM with V1.10 version of Roland A-50 MIDI Keyboard Controller. There are too many corrections and improvements from earlier versions - I can't list them all. Check Service Manual, it has the modifications from V1.01 up to V1.07.
I also have ROM A V1.05, please check my other items.
This item was provided by Roland as a Master EPROM for a Roland Service Center - Never used in a Keyboard.
I have a huge collection of synthesizers, I am always available to help in stuff related to the ones I own. Check my other items - decent prices for top products sent immediately, well packed and tracked mail.
Contact if you are looking for something. I repair (and collect) synthesizers since 1992.
I will send worldwide (tracked) for free. I'll ship same day or next, depending on payment hour.
SHIPPED FROM EUROPE