[sdiy] Two interesting early SDIY projects

[Paul Maddox]

As has been mentioned, I remember the music 500/5000.

FWIW, it's a straightforward wavetable based synthesiser (PPE
Wavecomputer 360) without a low pass filter (Wolfgang Palm added that
in 82 to create the PPG Wave 2.0).

The real trick to getting a fast and effective system is gaining
access to Dual Port RAM for the accumulators (PPG used 74S189s).

This could all be recreated on an FPGA (I did some work a while back
with a couple of DIYers on recreating a PPGs digital stuff inside an
FPGA, Magnus Danielson and Hermann Seib) with very little difficulty.

Paul




On 3 January 2011 11:29, Steve Lenham <lenham at clara.co.uk> wrote:
> Thanks a lot, Mike - that would be great. I've had some other expressions of
> interest in the scans too.
>
> Even if we can't locate the 8088 code, it will still be interesting to see
> the TTL-based voice processor and how much, or haw little, it has in common
> with units like the DK Synergy.
>
> Best regards,
>
> Steve L.
>
>> Steve,
>>
>> I've got the requisite Wireless World articles in front of me now.
>>
>> It will be a few days before I can get round to scanning them, so I'll
>> drop
>> you a note when they are done.
>>
>> There is very little code in the articles though, so you may have to
>> contact
>> the author for a copy. This apparently was either a 50 page listing of the
>> 8088 source code or a BBC Micro 40 track disk!
>>
>> Regards
>>
>> Mike Gorman
>>
>> -----Original Message-----
>> To: SDIY list
>> Subject: [sdiy] Two interesting early SDIY projects
>>
>> While searching for someting completely different, I stumbled across a
>> couple of interesting early '80s SDIY projects which I haven't seen posted
>> before.
>>
>> 2-VCO monosynth with MIDI and patch storage from 1984/5:
>>
>> http://koo.corpus.cam.ac.uk/projects/elric/
>>
>> 8-voice digital polysynth with MIDI and arpeggiator from 1983:
>>
>> http://koo.corpus.cam.ac.uk/projects/digipoly/index.html
>>
>> The Digipoly design was published in "Electronics and Wireless World"
>> during
>>
>> 1985(?) - I would love to get a copy/scan of these articles if anybody has
>> them in their archive.
>>
>> Cheers and belated Happy New Year,
>>
>> Steve L.
>
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