[Ham-Computers] RE: Lpt port trouble

[Hsu, Aaron (NBC Universal)]

Don't know if you already got an answer for this, but the Parallel
"standard" (IEEE-1284) shows pin 16 as active LOW.  This means that at
power-on (and resets), the pin is HIGH.

So the port is acting normally.  Looks like you might need to add an
inverter (e.g. a transistor or 7404/7416) to your circuit.  There's probably
also a place to configure CTWin and DX4Win to use active LOW keying and
you'll need to do that too.

73,

  - Aaron, NN6O



-----Original Message-----
From: ham-computers-bounces at mailman.qth.net
[mailto:ham-computers-bounces at mailman.qth.net] On Behalf Of La6wea
Sent: Friday, September 30, 2005 1:28 PM
To: ham-computers at mailman.qth.net
Subject: [Ham-Computers] Lpt port trouble


I made a cw interface to use with Ctwin and Dx4win using the Lpt port. The
problem is when I turn on the computer or restart it the computer will key
the ptt line (p16 goes high) and will staye keyed until I start Ctwin or
Dx4win. In a case of power failure and the pc comes on when the powe comes
back, and the radio also is on the radio will stay on transmitt. It seems
that the Lpt port activiate the ptt as soon as the bios starts to load. I
have only one Lpt port on the computer. My solution has been tol unplugg the
Lpt port when I leave th shack but that can be forgotten.I am running Xp-Pro
with servicepacks 1 and 2 Any solution? Or how can I write a Bat file that
reset the port.?

Best Regards: Ken

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