[sdiy] Identification of an unknown MIDI CV interface

Ullrich Peter Peter.Ullrich at kapsch.net
Wed Sep 28 23:26:15 CEST 2022


And there are additional notes in the March 1991 Elektor magazine!

Ciao
Peter
________________________________
Von: Synth-diy <synth-diy-bounces at synth-diy.org> im Auftrag von Ullrich Peter via Synth-diy <synth-diy at synth-diy.org>
Gesendet: Mittwoch, 28. September 2022 23:19
An: S Ridley <spridley1 at gmail.com>
Cc: synth-diy at synth-diy.org <synth-diy at synth-diy.org>
Betreff: *EXT* Re: [sdiy] Identification of an unknown MIDI CV interface

Hi Steve!

Thank you for the hint.  I built this PCB lots of years ago and used it for a midi controller (doesn't exist any longer).
I just had a look on the Elektor Collection CD - yes the article is stored there as PDF. About 1MB.

Ciao
Peter
________________________________
Von: Synth-diy <synth-diy-bounces at synth-diy.org> im Auftrag von S Ridley via Synth-diy <synth-diy at synth-diy.org>
Gesendet: Mittwoch, 28. September 2022 22:59
Cc: synth-diy at synth-diy.org <synth-diy at synth-diy.org>
Betreff: *EXT* Re: [sdiy] Identification of an unknown MIDI CV interface


It was also published in Elektor, February 1991, but with a different pcb layout.


Steve


On Wed, 28 Sept 2022 at 12:12, René Schmitz <synth at schmitzbits.de<mailto:synth at schmitzbits.de>> wrote:

Hi all,


I've goggled a bit and it seems this is a clone of the Doepfer MCV1, which apparently was published as a set of articles in

the German Magazine "Funkschau".

http://studiorepair.com/gallery/Doepfer/MCV1/slides/Doepfer_MCV1_PCB_CS__STUDIOREPAIR_08031701_0803193972.html<https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fstudiorepair.com%2Fgallery%2FDoepfer%2FMCV1%2Fslides%2FDoepfer_MCV1_PCB_CS__STUDIOREPAIR_08031701_0803193972.html&data=05%7C01%7CPeter.Ullrich%40kapsch.net%7C97a8fc89cdae43fd641a08daa197aa26%7C5f9ce5277e3e4e83a8a4b6c848f85ab5%7C1%7C0%7C637999970009563394%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=iOarnf%2BlHy6bQrJlYCtrNjitRC3cgQlYB6RxFlq725Q%3D&reserved=0>

https://doepfer.de/alte_anl.txt/MCV1_V1.txt<https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdoepfer.de%2Falte_anl.txt%2FMCV1_V1.txt&data=05%7C01%7CPeter.Ullrich%40kapsch.net%7C97a8fc89cdae43fd641a08daa197aa26%7C5f9ce5277e3e4e83a8a4b6c848f85ab5%7C1%7C0%7C637999970009563394%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=nf89ck3a4%2FGFLsbNdZUA%2Blhi0auYOJgNz0DOpKJ0EWE%3D&reserved=0>

http://www.pc1ha.franken.de/habel/musik_03.htm<https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.pc1ha.franken.de%2Fhabel%2Fmusik_03.htm&data=05%7C01%7CPeter.Ullrich%40kapsch.net%7C97a8fc89cdae43fd641a08daa197aa26%7C5f9ce5277e3e4e83a8a4b6c848f85ab5%7C1%7C0%7C637999970009563394%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=%2FbQ4bZMTHRWPirGqke6pOPtFgobASM2A0WxQ3%2Fvhuf0%3D&reserved=0>


Best,

 René


BestJürk Habel und Dieter Do

epfer, MIDI-Interface für Oldtimer, Funkschau Hefte 9/89, 10/89 und 11/89, Franzis-Verlag, München

Am 28.09.2022 um 12:36 schrieb Mike Bryant:

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<mailto: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:





https://florian-anwander.de/moog_prodigy/Unknown_Midi_Interface.jpg<https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fflorian-anwander.de%2Fmoog_prodigy%2FUnknown_Midi_Interface.jpg&data=05%7C01%7CPeter.Ullrich%40kapsch.net%7C97a8fc89cdae43fd641a08daa197aa26%7C5f9ce5277e3e4e83a8a4b6c848f85ab5%7C1%7C0%7C637999970009563394%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=QtphBU94OuSjpB03jgmdH%2FOqarUknTjtz4CxrnItuRk%3D&reserved=0>



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.





Best,

 René



--

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

http://schmitzbits.de<https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fschmitzbits.de%2F&data=05%7C01%7CPeter.Ullrich%40kapsch.net%7C97a8fc89cdae43fd641a08daa197aa26%7C5f9ce5277e3e4e83a8a4b6c848f85ab5%7C1%7C0%7C637999970009563394%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=PD9dTGn3%2FcUBn%2BFoqyePJmCfREdnw1N%2BqRpnmxnBcQg%3D&reserved=0>

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