Hello! I'm waiting (a few months from Japan to Brazil) CM-500 serial ZD41184, it looks like an older unit, it only have the GS logo . This mod will work with any version of the CM-500, right?
When it arrives I will give a try in the mod. Just need to figure out how to burn a 27c512 in a NIC. Some fellow people of Vintage Computer Forum done this a few times.

Thank you guys, this will be awesome.

Cloudschatze wrote on 2023-01-10, 03:33:

Separate from the LFO/vibrato issue, I am currently troubleshooting yet another errant CM-500 behavior, this time related to the MIDI switching/handling function of the Mitsubishi 7702 MCU. If anyone happens to have a CM-500 with a serial number greater than ZE13000 (with corresponding "CM-500 1.02" ROM @ IC22), can you please get in touch with me?

Is this something you're still after? Didn't see in this thread if you got what you needed. I have a CM-500, serial ZE14382 with the 1.02 ROM installed, so let me know if I can help. Couldn't send a PM, haven't posted here enough to do that yet apparently.

Hello everyone, I am also piling up on this thread now looking to update my CM-500. I am based in central europe and want to ask if a kit is available. I am willing to pay for the shipping.

Best
Michael

maikolator wrote on 2025-05-10, 08:00:

Hello everyone, I am also piling up on this thread now looking to update my CM-500. I am based in central europe and want to ask if a kit is available. I am willing to pay for the shipping.

Best
Michael

DM sent.

Thank you @salient very much but I don’t think i can even respond to PMs yet.

Can I reach out to you through the website on your signature?

Salient wrote on 2025-05-11, 14:10:

maikolator wrote on 2025-05-10, 08:00:

Hello everyone, I am also piling up on this thread now looking to update my CM-500. I am based in central europe and want to ask if a kit is available. I am willing to pay for the shipping.

Best
Michael

DM sent.

Thank you @salient very much but I don’t think i can even respond to PMs yet.
Can I reach out to you through the website on your signature?

maikolator wrote on 2025-05-11, 18:16:

Thank you @salient very much but I don’t think i can even respond to PMs yet.
Can I reach out to you through the website on your signature?

Sure!