Lab-Volt model 355 6502 based trainer help?

[Bob Rosenbloom]

I have two of these Lab Volt trainers that use the 6502 microprocessor. 
Does anyone have any docs on these?
I contacted Lab-Volt but they don't even remember them and can't help. 
They are designed to help students
learn microprocessors and have dip switches that can be set to introduce 
faults. I would love to find out the
commands in the monitor EPROMS and what faults can be set. Some photos 
from my web site are here:

Thanks,

Bob

http://www.dvq.com/oldcomp/photos2/1k/lv_355_1.jpg
http://www.dvq.com/oldcomp/photos2/1k/lv_355_2.jpg
http://www.dvq.com/oldcomp/photos2/1k/lv_355_5.jpg