[HomeBrew] RE: Lpt port trouble

[Hsu, Aaron (NBC Universal)]

I think many here are misssing a basic point...pin 16 is defined by
IEEE-1284 as active *LOW*.  So the circuit should be designed/modified as
such and the apps configured to use active LOW.

I also posted this on Ham-Computers earlier.

-----Original Message-----
Sent: Friday, September 30, 2005 1:28 PM
Subject: [Ham-Computers] Lpt port trouble

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