29 Sep
2020
29 Sep
'20
11:55 p.m.
Den ons 30 sep. 2020 kl 08:26 skrev Josh Dersch via cctalk <
cctalk at 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