From:	Eric Heft <eheft AT valhalla DOT cs DOT wright DOT edu>
Subject:	[SUM] Debugging - How to?
To:	djgpp AT sun DOT soe DOT clarkson DOT edu (djgpp)
Date:	Tue, 16 May 1995 20:09:31 -0400 (EDT)

Here's a summary of the often asked question , How do I debug a
graphics application programed under DJGCC.

   The best way I've found as my program produces all graphcs
was to use MSHELL written by DJ Delorie which can be found 
at ftp:omnigate.clarkson.edu//pub/msdos/djgpp/pub/mshell*.zip
This program redirects all text mode characters and redirects 
them to a monochrome card, thus the debug text ends up on the
2nd monitor and my SVGA gets the graphics as normal. Simply evoke
mshell go32 -d gdb testprog ... and debug away ;)

   I was informed by DJ that it is possible to use a CGA 
card/monitor but you would have to hack the source and lose the
ability to do graphics , which sadly is the point ;)

FINDING monochrome cards/monitors can be a drag however as most 
places dont have monochrome stuff at a good price, if at all. I 
finally located a monitor to match the monochrome card by calling 
up the local universities asking them if they had any old eq.
For those who don't know, there seem to be 2 types of monochrome 
connectors, 1 is a 9 pin connector, the other is just a RCA plug. 
Be sure to get the right card/monitor ...

Another source I found looking in one of the alt.forsale.xxx groups
was :
----------------------------------------------------------------------
Subject: Re: Monochromes + CGA monitors for Sale

    3		12" IBM Monochrome(model 5151)			$10
    1		13" ARCHIE Monochrome				$10

We can get monochrome video boards for you for $7. 
Payment can be done in 2 ways: 1) send a check/money order made out 
to Computer Resources Network, Inc or 2) COD via UPS but with an 
additional $5 charge.

Kathy
Computer Resources Network, Inc.
11605 Edmonston Rd.
Beltsville, MD 20705
crn AT imssys DOT com or crn AT imssys DOT imssys DOT com
----------------------------------------------------------------------

In closing, If you are doing graphics and don't want your program's
output clouded with debug information, find a monochrome card and
monitor ! For under $20 it's well worth the investment .

Thanks to all those who took the time to help.
Eric

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