LPT1 problems

[Henk Remijn]

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
>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)
>
>
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Henk Remijn				Systems engineer at
PA3EOB (JO11WM)				Cargill Wet Milling
Hansweert, The Netherlands		Bergen op Zoom
E-mail: hremijn@zeelandnet.nl		The Netherlands
         pa3eob@pi8goe.ampr.org
PI4ZLD homepage: http://www.hzeeland.nl/~eddy/ham/rdb


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