Yamaha CS80

Wayne Griffin wrote:

> --- David Rogoff <david@...> wrote:
>
> they can record performances with poly aftertouch.
> > A MIDI kits with
> > MIDI out for the CS80 would be amazing, but I can't
> > see anyone taking
> > the time and money to design and build them :(
> >
> > David
>
> The man for the job is Tony Karavidas of Encore
> Electronics.
>
> I'm not certain that an entire new CPU isn't in order-
> along the lines of what's been done for the Rhodes
> Chroma or over the last few years.

The CS80 doesn't have a processor. It has a custom keyboard scanner chip
and matching DAC. Everything else is a ton of standard little CMOS ICs.
All the CV routing and "patch" memory voltages are mixed and modulated
on lots of separate boards with tons of resistors and Yamaha VCA chips.

> We all want patch
> memory and as much MIDI as possible. I suspect that
> we'll never get to transmit the pressure data since
> that seems to imply ADC on every channel,

That's actually pretty easy - just a decent speed ADC with an 8-to-1 mux
in front.

> but on a
> redesigned CPU board... [w]
>

You'd have to start by replacing the KAS board. By the time you're done,
you're basically replacing all the circuit boards under the keyboard!
Believe me, I've seriously thought about this, but then I got better...

David