Mike Davis wrote:
> Let me start off by saying "I hate RS-232".
RS-232 is not a problem as long as you have
a few tools and some patience.
> I'm using Port A (on the SIO) and have configured the A3 Jumper to
> have
You might change the A3 jumper (temporary) by
REMOVING jumpers:
TD Pin 1 to Pin 15 RD
RD Pin 2 to Pin 16 TD
and INSTALLING a jumper:
RD Pin 15 to Pin 16 TD
This will give you a loopback to your terminal that
will test your cabling and the correctness of the
handshaking with your terminal.
If this does not work, I would look at the
handshaking first.
If that works, and you have a logic probe, you
could change the A3 jumpers back to their original
jumpers and using the logic probe, test for the
pulses being received at pin 3 on the 8251 at
B5.
--Doug
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Doug Coward
_at_ home in Poulsbo, WA
Analog Computer Online Museum and History Center
http://dcoward.best.vwh.net/analog
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Received on Tue Feb 18 2003 - 01:18:01 GMT