You're watching an EPROM with the last official OS (3.1 ,marked A) for the Roland JX-8P synthesizer. This is for the later version - you simply use this if your EPROM is 3.0 or serial number above 530350. For the other version, (2.3) please see my other products.
You can check your firmware version by powering the synthesizer while pressing the PIANO 1 button.
There is another EPROM (marked B) that doesn't need to be changed - the code remained unchanged during all production although numbers usually match EPROM A to avoid confusion.
I only sell EPROMs for the synthesizers that I own - everything is tested properly. The EPROM's window is sealed with UV proof aluminium label.
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.
These are NEW products, not new old stock. I have sliding pots for most vintage gear, including most Korg, Yamaha and Kurzweil. Some rotary for older Moog (Micromoog) and Transcendent 2000. Also some switches and some SSM and Curtis (CEM) chips. I will be selling all these in the next few weeks. 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