San Mateo, 31 oktober 2006.

I'm not sure if this helps, but in my Drake 2 I used an RTL inverter to
handle my RS-232 input. It should be somewhere in the schematic:

http://people.zeelandnet.nl/whhofman/jen//PIC/drake2tvonly.png

R7 is 27 kOhm, R8 is 1 kOhm, the transistor is a 2N4124. I've had successes
with it up to 100kbps, although I generally use it at 2.4Kbps, so I'm not
sure if those 100kbps speeds are reproducable.

And yes, the circuit relies on the diodes inside the PICmicro to handle
excesses. In a real circuit you might want to have additional diodes
external of the PICmicro.

Greetings,
Maarten Hofman.
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