Yamaha CS80

>>I designed a KAS replacement, which I need to build one of these 
days<<

Scott, I'm trying to have similar results through Reaktor: did you understand the logic behind the KAS ( cycle and assignment according to "most recently used" voice cards, I guess?) because I'd like to render it inside the reaktor then overcoming the inbuilt cycle voice assignment.
  ----- Original Message ----- 
  From: Scott Rider 
  To: yamahacs80@yahoogroups.com 
  Sent: Tuesday, September 25, 2007 9:21 PM
  Subject: Re: Crow's replacement M-boardRe: [yamahacs80] Re: Did any of your CS80 *restorations* involve new IC's...?


  A PIC EG runs on 5V which I obtain using a local regulator. The 
  output of the EG is a 10-bit PWM signal that is integrated into an 
  usable voltage. The phase accumulator outputs samples (curves are 
  interpolated from lookup tables) at a rate of 20KHz. Tom Wiltshire of 
  SDIY is the one who did the grunt work on this kind of retrofit EG; he 
  has examples at his web site, electricdruid.net

  I designed a KAS replacement, which I need to build one of these 
  days. It uses discrete DACs and my favorite sneaky way of doing level 
  shifting of bipolar logic: RS232 chips. (The venerable MC1488, MC1489).

  Crow
  /**/

  David Rogoff wrote:
  >
  >> 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?
  >
  > 



   

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