[sdiy] Xpander (was: Re: Moog Memorymoog clone almost completed)

[Mattias Rickardsson]

Brian Willoughby <brianw at audiobanshee.com> skrev:

>
> On Oct 17, 2020, at 11:24 AM, Michael Zacherl <sdiy-mz01 at blauwurf.info>
> wrote:
> > On 16.10.2020, at 23:38, MTG <grant at musictechnologiesgroup.com> wrote:
> >> What CPU did Oberheim switch to for Xpander? Is that 6809?
> >
> > 2x 6809 (one main, one for the voices) - IIRC.
> > m.
>
> Yes, and the Matrix-12 has 3x 6809 (one main, one for each of the 6-voice
> boards)
>

What was the typical cost of such a synth CPU in the '80s? Compared to
today's 1-2 dollar MCUs they must have been quite an investment.

As I noted a while back, there are pins on the main board that could allow
> four 6-voice boards to be attached, but that feature was never developed.
> Such a beast would have 5x 6809.
>

So, a Matrix-24 then? Wow. :-)

/mr
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