Yamaha CS80

Richard Atkinson wrote:
> A little known aspect of the Yamaha CS voice assigner chip is that it is in 
> fact configurable from 1 to 8 voices in units of one voice. So you could 
> maybe make it a 7 voice CS-60 if you cannot repair the faulty voice card.
>
> Richard
>   
  This is a hold-over from the key assigners used in Electone organs.  
Most of the "PASS" models of the 1970s used  7-voice key assigners along 
with some combinatorial logic to obtain 11-note polyphony across the 
usual two keyboard manuals and pedalboard.  The tone generator was a 
wavetable type and not limited to sines (not bad for 1975) while the 
filters were IG00155 SVF chips, a close relative of the IG00156 except 
there was no keyboard tracking voltage control input.  The EGs were 
interesting: diode-programmable digital function generators, a kind of 
ancestor to the EG-S chip of the DX line in later years.  VCAs were the 
IG00151--so find old Yamaha home organs put to pasture and liberate soem 
IG chips. ;)


Crow, who has this EX-2 Electone and visions of kitbashing it into an, 
er,  GX-2.  Eh..someday..
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