[Trlog] Strange laptop LPT behavior

N9CO at aol.com N9CO at aol.com
Thu Mar 13 08:46:41 EST 2003


Greetings, all

I've recently came upon an old 486dx (25 MHz) laptop.  After deleting 
everything but DOS 6.22 off the drive, I installed TR.  TR runs fine.  The 
serial port works, and controls the rig.  But the LPT port is acting very 
strange.

Whenever the LPT port keying/ptt/paddle adapter is connected, the PTT is 
activated, and alternating Morse dots and dashes (di-dah-di-dah-di-dah...) 
are sent at whatever speed TR is set to.  It seems that something is shorted 
in the LPT port on the PC.  This same LPT adapter works fine on my regular 
DOS PC.  It works fine on my LINUX box, too.

The offending laptop in question is an ALR Ranger, circa early 1990s.  I ran 
CheckIt diagnostic software on it, and it found no problems.

Anyone else seen anything like this?

Thanks in advance!!

73,
Charlie  N9CO


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