At 02:00 AM 10/26/95 +0000, you wrote:
>I think it is safe to say that LPT1 has been broken since 9.23 or 9.24 at
least.
>Let's put that rumor to rest. I checked the LPT port pins 1, 17 and 18 and
>there is NO switching on LPT1 at all in 9.26. LPT2 is fine on 9.26. I
>confirmed this with two completely different computers.
LPT1 works for me. Tested cw keying and band data on LPT1 with version
9.26. I'll bet the problem/confusion has to do with enhanced
(bidirectional) versus "standard" unidirectional LPT ports. The original
IBM design, while it had a bidirectional buffer, was only an output port to
the printer because the direction control on the buffer was hardwired to
ground. I havn't seen any documentation on bidirectional ports (can anybody
give me a reference) but normal practice with bidirectional ports is that
they come up in input mode on reset. That's the safe way to do it. In the
enhanced mode there must be a way to control the direction pin on the buffer
and a short little program that goes out and sets that bit before loading CT
would proabably fix the problems. Anybody got any ideas?
Fred KE7X
Fred Cady (ieefc@msu.oscs.montana.edu)
--
Submissions: ct-user@ve7tcp.ampr.org
Administrative requests: ct-user-REQUEST@ve7tcp.ampr.org
WWW: http://ve7tcp.ampr.org/Lists/ct-user.html
Questions: reisert@ve7tcp.ampr.org
|