[sdiy] Identification of an unknown MIDI CV interface

Mike Bryant mbryant at futurehorizons.com
Wed Sep 28 12:36:49 CEST 2022

Maybe the original design on the etched PCB was a general purpose MIDI board (hence the matching firmware) and provided an 8 bit GPIO port, but disobeyed the rules and omitted the opto-isolator, so whoever used it added that as well as the DAC they needed for this design on the perfboard.

From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of René Schmitz
Sent: 28 September 2022 11:29
To: synth-diy at synth-diy.org
Subject: Re: [sdiy] Identification of an unknown MIDI CV interface

Hi all,

On 28.09.2022 11:30, Ingo Debus via Synth-diy wrote:


The etched PCB looks like a general purpose board. The MIDI stuff and the DAC are on the perf board.

That's what I was thinking too, but what is interesting is that the logo on the EPROM matches the one on the board.

So Hardware and Firmware seem to be from the same origin.

But the rest seems very bespoke and has a high home brew appeal.  This doesn't quite fit to me, because who

ever wrote the firmware would know what hardware to drive.




synth at schmitzbits.de<mailto:synth at schmitzbits.de>

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