Due to the large volume of summary requests I received, I am posting this summary instead of mailing it. It's somewhat long, so hit 'n' now if you're not interested in this stuff. After the replies I have included some software that I threw together to play with the card reader. This file contains all the information I have on this subject.
Additions are most welcome.
Note also that there was another summary post in recent days with information on how the data on the cards is encoded. Someone with a fully functional reader can easily extend what I wrote to get it to decode the actual data content of the card. The wires are red, yellow, green, blue, and black. But I don't know active levels, or which wire is what. I picked few week ago a magnetic credit card reader from a another surplus outfit.