[svlug] snagging another computers printer output

Larry Colen lrclug at red4est.com
Fri May 2 17:01:32 PDT 2003

I did some more research and found a project for doing this:


The key to search on is lptcap

This page has schematics for some hardware needed to do the job.

This discussion did get me to thinking about looking for a parallel to
serial converter, and there seems to be one at:

I suppose that I should have phrased the question about how I can
capture data being sent to a parallel printer from a "closed dos box",
rather than trying to suggest a method (input to the parallel port).

On Fri, May 02, 2003 at 04:43:50PM -0700, Tim wrote:
> On Fri, May 02, 2003 at 04:16:25PM -0700, Larry Colen wrote:
> > The dyno that I've been using to tune my MG is a "smog" dyno, rather
> > than a performance dyno. It won't save any of the data to harddrive,
> > it only prints it out to the printer.  It should not be too hard to
> > write a program that would allow me to hook up my parallel port to the
> > other parallel port (I'd probably need to find an old laplink cable),
> > and store the data directly into a file. However, I expect that such a
> > program has already been written.  I've just tried a quick google
> > search as well as freshmeat, but nothing immediately lept up.  Does
> > anyone know, off hand, of a program that would let me capture another
> > computer's printer output? 
> I don't know that it would this simple, but maybe you could try:
>   cat /dev/parport0 > capturefile
> Or:
>   cat /dev/lp0 > capturefile
> Again, I have no idea if either of these would work, but maybe it is
> worth a try.
> > This would let me stuff the data into a spreadsheet, calculate torque,
> > do pretty pictures etc.
> The data sent to the printer would be in a format that the printer
> understands.  For my Lexmark E210, it is something called "GDI", and it
> uses that format even for ASCII data.  I've tried printing ASCII files
> without the GDI filter before, and the printer appears to just discard
> it without any indication.
>    - Tim

I've found something worse than oldies station that play the music I used to
listen to. Oldies stations that play the "new" music I used to complain about.
lrc at red4est.com                                    http://www.red4est.com/lrc

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