The code should be run with group "gpio", and uses /dev/gpiomem.
I set up a user "tester", who logs in the gpio group.

If you try this with the PiDP code installed, you'll have to kill 
the SIMH instance.  It is not sufficient to request PiDP to "stop".  
I use a command like 
    $ ps -aef | grep pidp
to obtain the pid (usually 790 or so), and then a command like 
    $ sudo kill 790
to nuke the running PiDP software.

You need the cable adapter board, or a homebrew equivalent.  You 
can get the Eagle drawings in the directory:
    http://svn.so-much-stuff.com/svn/trunk/Eagle/projects/Stearns%20Tester/

You also need to replace the LS06 (IC6) in your tester with a 
jumper block.  To make a suitable block, take a 14 pin socket 
and install jumpers: 1-2, 3-4, 5-6, 8-9, 10-11, and 12-13.
Leave pins 7 and 14 empty.

    Vince