Blasphemy! If you own pins, you need these testers!
Said somewhat tongue in cheek, but they really do come in handy.
Here's a short video of the tester working in a correctly operating System 80A MPU.
Here's my interpretation of a "users guide". The description Marco provides is a bit confusing.
One long blink - ROM is running.
Short flicker followed by a longer single blink - 5101 tested good.
Short flicker followed by two longer blinks - U4 tested good.
Short flicker followed by three longer blinks - U5 tested good.
Short flicker followed by four longer blinks - U6 tested good.
I had emailed Marco about adding his tester info to the PinWiki, similar to the way we've added Leon's test articles, which we added verbatim. But Marco plans to create his own page. I thank him for the work he's done on the ROM, and him making it available to us all.
Chris Hibler - CARGPB #31
http://www.PinWiki.com - ThePlace to go for Pinball Repair Info