[sdiy] Understanding 80s Synth Architectures
grant at musictechnologiesgroup.com
Sat Feb 5 21:49:37 CET 2022
I agree it must have been a focused effort to pull that off. As a casual
observer I can say that it was most definitely written in assembler (as
almost everything was at that time). Your closest HLL would probably
have been PL/M at the time (but that was Intel focused).
------ Original Message ------
From: "rburnett at richieburnett.co.uk" <rburnett at richieburnett.co.uk>
To: "Synth-Diy mailing list" <synth-diy at synth-diy.org>
Sent: 2/5/2022 10:16:02 AM
Subject: Re: [sdiy] Understanding 80s Synth Architectures
>Wow, that is pretty impressive. And a substantial undertaking to figure
>out how it all works and then comment it! How long did that take you!?
>Do you think the original code was written in assembly, or compiled from
>a higher level language like C?
>On 2022-02-05 04:10, Anthony via Synth-diy wrote:
>> In case you're interested in understanding how the firmware of these
>> 80s synthesisers was implemented, I've done an annotated disassembly
>> of the Yamaha DX7's firmware ROM. This repository contains a lot of
>> information regarding how the synth itself functioned, and was
>> designed. Hopefully it provides a little bit of insight into how
>> synths in this era were designed! That's the reason I began this
>> project. I was interested in understanding the exact same topic.
>> ------- Original Message -------
>> On Friday, February 4th, 2022 at 9:22 PM, ackolonges fds via Synth-diy
>> <synth-diy at synth-diy.org> wrote:
>>> Hi Everyone,
>>> As the local SDIYer I sometimes get asked to try and fix synths
>>> from the 80s like various Rolands, Korgs, Oberheims etc. and I
>>> generally just try to pinpoint the rough area of the issue and
>>> replace logic chips until the issue is resolved...
>>> Most of these synths have a CPU connected to everything via a
>>> parallel address bus and a parallel data bus, with all sorts of glue
>>> logic chips doing various things. They also usually just have 1 DAC,
>>> time-domain multiplexed to all of the different parameters via more
>>> logic chips.
>>> Obviously this is very different to the modern ways that
>>> microcontrollers and DACs are used in synths, and since I wasn't
>>> around in the 80s, these older architectures are very foreign to me.
>>> To aid in my troubleshooting efforts, I would love to better
>>> understand the details of how these architectures work, so I was
>>> wondering if anyone on here would be able to point me to any
>>> resources that could explain these types of systems to me, be they
>>> websites, articles, or books?
>>> Thanks a lot for any advice you might have.
>> Synth-diy mailing list
>>Synth-diy at synth-diy.org
>> Selling or trading? Use marketplace at synth-diy.org
>Synth-diy mailing list
>Synth-diy at synth-diy.org
>Selling or trading? Use marketplace at synth-diy.org
More information about the Synth-diy