I find allowio works for other programs but I *still* get 'Privileged
Instruction' errors when I run Digitrace through it.

Running win2k on a steam driven laptop, any ideas anyone...?

Simon

-----Original Message-----
From: Larry Bradley [mailto:lhbradley@IGS.NET]
Sent: Friday, December 05, 2003 3:08 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC]: Logic Analyzer


Another chap posted a link. AllowIO works quite well. I found that I had to
tell it to use all ports (the /a option), rather than just the 3F8 for the
printer port.

What you do with AllowIO is have it execute the digitrace program. Works
well.

I'm going to hook up an octal buffer as an isolator between the parallel
port cable and the PIC pins. The parallel port pins have a 4.7k resistor
from +5 to the pin, and a transistor to ground. Thus your circuit  being
monitored will have some voltage applied. I stick a 1k resistor in series,
which works OK, but I think the buffer is a better idea.

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