[Top] [All Lists]

LPT1 problems

To: <ct-user@contesting.com>
Subject: LPT1 problems
From: hremijn@zeelandnet.nl (Henk Remijn) (Henk Remijn)
Date: Fri, 27 Oct 95 01:32:36 UTC
On Thu, 26 Oct 1995 07:43:51 -0600 you wrote:

How about a simple QBASIC program with the following statement
OUT "LPT port address", "ouput byte"

73, Henk

>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
>>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
Henk Remijn                             Systems engineer at
PA3EOB (JO11WM)                         Cargill Wet Milling
Hansweert, The Netherlands              Bergen op Zoom
E-mail: hremijn@zeelandnet.nl           The Netherlands
PI4ZLD homepage: http://www.hzeeland.nl/~eddy/ham/rdb

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

<Prev in Thread] Current Thread [Next in Thread>