[sdiy] pre Uprocessor schematics with ADC/DAC?

[Scott Nordlund]

I have looked at the Synergy schematic, but it was only briefly and I didn't have a chance to make much sense of it.  Would you say that it performs more or less as a "coprocessor" that is largely controlled by the CPU (for the state machine, etc.), or does it act as a more or less autonomous unit, like the OPS/EGS chips in the DX7?  I got the impression that it was more of a "coprocessor", in which case I wouldn't be able to make much sense of it without understanding how the CPU interacted with it.

----------------------------------------
> From: lanterma at ece.gatech.edu
> To: subjectivity at hotmail.com
> Subject: Re: [sdiy] pre Uprocessor schematics with ADC/DAC?
> Date: Thu, 21 May 2009 16:37:50 -0400
> CC: synth-diy at dropmix.xs4all.nl
>
> The Synergy is a prime example - the digital oscillator board has
> about 120 standard TTL chips.
>
> You can find schematics/pics on my Synergy page.
>
> But really, all that is easier now with microprocessors or FPGAs.
>
> I think the Wave PPG had a lot of logic in the raw, but I'm not sure.
>
> Sent from my iPhone
>
> On May 21, 2009, at 9:28 AM, Dan Snazelle 
> wrote:
>
>>
>> this might be a strange request but i am very interested in ANY
>> information/links/ideas on finding old schematics from the 70's
>> (audio related but not just necessarily synth) that use Analog to
>> Digital Converters AND Digital To Analog converters but which use
>> logic instead of a microprocessor to control them.
>>
>> all the synths i have looked at that have ADC/DAC setups have a
>> programmed brain of some kind controlling them (prophet 5, etc)
>>
>> but i know there were some that used TTL or CMOS to send commands.
>>
>> anyway....one particular example is the EVENTIDE H910.
>>
>> i think i could learn some interesting things, such as how they got
>> the Audio In and Out, how they used multiplexers or sample and
>> holds, and also what types of clocks, and if they had presets,etc.
>>
>> thanks!
>>
>>
>>
>>
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