The only EPROM store promising to ONLY use brand new, newly manufactured chips! Don't pay for 30, 40 year old re-programmed chips that will suffer from BIT ROT when you could get brand new ones. Yes I have the best prices and my chips are actually Brand New. I am also the only seller offering a 1 year free replacement on all my chips because I am that confident in them.

New EEPROM, not old stock. Install instructions sent via Reverb messages after purchase. Over a dozen sold to very happy buyers!!!!

Please back up your custom data before installing since if you're upgrading from a very old version, you might need to factory reset your MR61/76 (hold Song Erase button and turn on the power.) The vast majority of MR61/MR76 have a new enough OS B and OS C chip to run this. Some very early MR61/MR76 need both B and C chips upgraded or it will not boot but this is extremely rare.

MR Rack latest OS is 1.50 and is a dual ROM set. I have the MR Rack OS chip for the same price in a separate listing.

Product Specs

Brand New (New)

Listed via the Reverb App

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About The Seller

shea alterio presents the night crew digital synthesizer museum
Joined Feb 2017
Cambridge, MA, United States


Accepted Payment Methods

Shipping Policy

Ships from Cambridge, MA to:

Continental U.S.
Everywhere Else

Please, no PO boxes for synthesizers and other larger music gear. If your order is ROMs or other small size parts like that, PO box is fine.

Tax Policy


Return Policy

Return Window

This product can be returned within 1 days of receipt.

General Terms

Items must be returned in original, as-shipped condition with all original packaging and no signs of use. Buyer assumes responsibility for all return shipping costs unless the item was not received as described.


Buyer receives a full refund in their original payment method less any shipping charges and a 15% restocking fee.

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shea alterio presents the night crew digital synthesizer museum

Cambridge, MA, United States
Joined: Feb 2017

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