[sdiy] SN76477 important info!

[PRCamann at aol.com]

IIRC, the "mixer" section of the 76477 was not an audio mixer, but a digital 
one.  That is, the signals are combined using a logical AND function.  This 
is the reason for the external multiplexing circuitry used in the Bullet kit, 
and for the external opamp tapping scheme used by Thomas Henry in his 
SuperController circuit.

In short, I don't see that there's any real difference between the 76477 and 
the 76477N with regards to the "mixer" section.

BTW, all the docs I've ever seen on the mixer make note of this logical AND 
technique, with appropriate caveats as to what it really means.

Paul Camann
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