Den ons 30 sep. 2020 kl 08:26 skrev Josh Dersch via cctalk < cctalk@classiccmp.org>:
> Hi all -- > > This is a long shot, but I was curious if anyone might have information on > the Motorola MDP-1000 minicomputer. I picked one up recently and I'm > working on restoring it. Of particular interest is the power supply, which > is external to the processor and which I am missing. I think I have the > voltages worked out (+/-5V and +/-15V), but there are a number of other > signals on the power supply connector that I'm unsure of at the moment. > > I've put a few pictures up here: > > https://1drv.ms/u/s!Aqb36sqnCIfMpIVYmzKjFnsT3nHh8w?e=b2iqqv Interesting machine. I see many standard Texas Instruments TTL parts in there, for example SN7475, SN7483, SN7401. But there are also chips marked SN4813, SN4814, SN4820. Never seen TI chips marked 48xx before. Also a few chips marked SN6392. Out of curiosity I tried to look them up in the old databooks at bitsavers, but didn't find them. What kind of lCs are these? /Mattis > >