Greetings to Microchip and Brian Boles,


If I was hard pressed to make a minimal suggestion, I'd suggest making a
c84 with a 12 bit A/D.  As you would probably use successive
approximation to perform the A/D, you could also get a D/A converter out
of the PIC as well.

By making TRISTATE sample and hold circuits as the outputs of your 8 I/O
pins, you could hook in an internal analogue multiplexor and thus offer
A/D and D/A on any of the output pins.  (naturally, these could not drive
any mega level of load, but on the c84 those pins can't anyway)

That would make the c84,  stumped for better words,  *AWESOME*.  It would
make the c84 the obvious choice for experimenters and
low intensity applications people.  You could imagine the number of CRO'S
and function generators, sound effects units etc etc that would fill the
magazines if such a beasty existed.

Hey, an alternate way to do the A/D is have in input Analogue input
connected to a simple VCO,  in turn fed into a counter.  Hey, that's how
I did it once, and it gave me the 8khz 8 bit sample rate I needed.

But yeah, c84 with A/D and D/A all the same...

Thanks,

Regards,
  Mick Kunstelj.

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