[Coco] CoCo temperature monitoring

[Dan Olson]

> Some of the bigger AVRs have built-in 10 or 12-bit A/D converters in them, 
> and can be programmed from a simple bit-serial protocol over a parallel port 
> interface.

If it were me, I'd use an AVR (or similar) to read the temperatures and 
sent them to the CoCo's serial port using a simple RS232 connection.  300 
baud would be fast enough for what you're doing.

 	Dan