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.

Have fun

At 09:00 PM 12/4/2003 -0500, you wrote:
>Larry Bradley wrote:
>>I noticed this in the PIC logic analyzer thread. Needing a logic analyzer
>>to debug a software SPI routine I was writing, I tried it the PC logic
>>analyzer noted below. It works like a charm. I'm using it on an 800 mHz Win
>>2K machine, and it seems to sample at about 2 mHz at its fastest. This was
>>too slow to handle the 20mHz 18F1320 I was using, so I just reconfigured
>>the 1320 to use the internal RC OSC at a lower speed and I was able to
>>monitor the waveforms and debug my code.
>>
>>It support 8 channels. To  use it, you just wire up a connector to your
>>PC's parallel port, and connect to the PIC pins in question via a 1K
>>resistor.
>>
>>
>>>Is the point of this project to have a logic analyser (in which case
>>>the "parallel port logic analyser" might be quicker/easier,
>>>http://www.xs4all.nl/~jwasys/old/diy2.html
>
>Hi Larry,
>I have the same setup as you have but opening the program gives an
>"Privileged instruction" message.
>
>On the above site, the author says:
>"Run on Win2000 NT XP with interrupted acquisition, using the allowio
>driver." But the link to this driver is broken.
>Any suggestions?
>
>Gaston
>
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Larry Bradley
Orleans (Ottawa), Ontario, CANADA

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