I don't know, but it reminds me many years ago, at Data General in the period after the book Soul of a New Machine was set, we had a problem as they were developing the Eagle (MV/8000), that they would come out with new generations of the boards and upgrade the machines.The lab manager noticed that every so often field circus would try to be helpful, and recycle the old out of spec boards into new computers, and didn't notice and thought the boards were good. Finally the lab manager came up with what he called a circuit tester, which had a normal 110 A/C plug on one end, and two wires on the other end. After he used the circuit tester, sure enough even field circus could verify that the board was bad.
Field Circus? Heh, you're dating yourself there. The 1st Unix box I did any real work on was a DG. Don't remember what model. (Prior to that, my exposure was figuring out how to fix a tty port on a Vax running Ultrix, so UUCP would work again.)That was a good book.