Hi, I have an old Grundy Newbrain AD computer which doesn't work. The machine powers up with random chars in the built in anode display, but doesn't respond to keypresses. I used the machine some 20 years ago, and when I put it away at that time it was ok. I've checked the voltages at the 4116 RAM's and they are ok (+5, +12 and -5 volts). The ripple is also within reasonable limits. I don't have the schema for the machine so right new I'm pretty lost. Is anyone able to help me out? If so, please answer directly at my email address. Regards, Torben Ring DENMARK