Yamaha CS80

replacing all the other boards than the ones involved with sound creation
with one FPGA sounds like a sensible choice and may even motivate me
to finally buy one of these beasts, lol...

  ----- Original Message ----- 
  From: Jeroen 
  To: yamahacs80@yahoogroups.com 
  Sent: Tuesday, September 25, 2007 6:02 PM
  Subject: Re: Crow's replacement M-boardRe: [yamahacs80] Re: Did any of your CS80 *restorations* involve new IC's...?



  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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