> They use the same
> ring memory table in the GX-1 and key assigner of the CS 50/60/80.
> There is a somewhat cryptic explanation in the CS service
> guide, pages
> 11 to 19, describing the encoder for 4 voices. JH references the
> service guide on his CS50 page,
You'll find the GX1 KAS schematic here:
http://www.sequentix.com/gx1/GX1-KAS.zipAre the separate assigner and octave chips used elsewhere ?
Looks like they were combined into a single chip for the CS synths, with a
matrix of keys rather than an input for every single key.
> If you look closely you'll see the actual electrical
> operation of the
> key scanner is ternary, not binary, it uses both -6.5v to 0 and 0 to
> +8.5v to derive logic states.
I'm sure that's not the case on the GX.
It has a +6/-9v supply for the assigner and octave scanning chips, but that
is just to limit the total supply voltage to 15v for the CMOS devices that
are used for the de-mux etc.
Cheers,
Colin f