[sdiy] Identification of an unknown MIDI CV interface

Mike Bryant mbryant at futurehorizons.com
Tue Sep 27 04:44:44 CEST 2022

Hi Brian

Yes Ferranti did do power control, notably nuclear power station software on which my wife worked, and defence.  And up to the 1980s they had a fab at Gem Mill near Manchester which made transistors and CMOS ICs.  Became part of Zetex who are now owned by Diodes Inc.  The IC next to the opto-isolator is one of theirs - ZN428 8bit DAC.

Also the use of the enamelled hookup wire was popular in the 1980s.  It had a special enamel that burnt off at liquid solder temperature making a solid joint but was insulated the rest of it so you could build complex wiring easily.

Datecode on the Intel is also older so I think this board originally came from the 80s, not 90s.

-----Original Message-----
From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of brianw
Sent: 26 September 2022 23:29
To: synth-diy at synth-diy.org
Subject: Re: [sdiy] Identification of an unknown MIDI CV interface

My first impression is that the perf-board says this was a one-off (not to mention the flying wires).

However, the sticker on the EPROM hints that it might have been from an open source project, although it could just be that the homebrew designer had a label printer and it was 100% DIY.

Disassembling the EPROM could prove quite useful, assuming that P80C32 has a known instruction set. What is this Ferranti that you mention, Mike? Google says power grid, defense.


On Sep 26, 2022, at 1:36 PM, Mike Bryant <mbryant at futurehorizons.com> wrote:
> I haven’t seen a Ferranti chip since the early 80s
> From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of Florian Anwander
> Sent: 26 September 2022 21:21
> To: synth-diy at synth-diy.org
> Subject: [sdiy] Identification of an unknown MIDI CV interface
> Hello
> Does anyone of you know this MIDI-CV interface? It is built into a Prodigy. You can see a logo "B E" and a board name "HPG110". Must be quite old, because I doubt someone has developed anything seriously on an Intel P80C32 from 1996 within the recent 20 years...
> https://florian-anwander.de/moog_prodigy/Unknown_Midi_Interface.jpg
> Regards
> Florian

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