Yamaha CS80

Interesting reads!

Here¹s what I¹m wondering, reading posts like these and Crow¹s ­ while most
of it goes way over my head, how far fetched is the idea of a cloned CS80?
As a midi module? (Even though it maybe as expensive or even more expensive
than a real one, it would be new and serviceable I guess?) In my (very
limited) brain, if you have thee voice cards, you have the sound source.
Hook it up to Midi, perhaps a memory to store a zillion presets etc..


Jeroen




On 9/25/07 5:51 PM, "David Rogoff" <david@therogoffs.com> wrote:

>  
>  
>  
> 
> Scott Rider wrote:
>> >   I have no plan for designs beyond the standard M board at this time.
>> > I need to proof and verify that the basic voice card works "as
>> > advertised" so that actually using it to replace broken cards means the
>> > machine still sounds like a CS-50/60/80.
> Seems very reasonable!
>> >
>> >   The EGs btw are (lowers voice to a mumble) *digital*, using  PICs and
>> > calculated rate tables similar to the EG-S chip of a DX voice engine.
> A couple of questions here.  How fast are the envelope samples?  What
> kind of digital/analog interpolation/smoothing are you using?  Also,
> I've thought many times about replacing most of the KAS and KBC boards
> with one, cheap FPGA.  The problem is that the CS80 runs all the digital
> logic off +8.5v/-6.5v (= 15volt supply) to interface with the analog
> stuff and modern digital chips will fry at any anything over 3.3v.  How
> do you handle the PIC?  Outboard DAC?  A billion level shifters?
> 
> Thanks & good work!
> 
> David
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