pictures of a IBM 3976 model 3 modem.
This modem was used in
IBM System/3 era to communicate between a bigger mainframe (RJE) or
with a IBM cluster controller.
The 3976 was developed by IBM in the late sixties,
round the same time as
the IBM System/3. This modem was
produced end 1973.
The maximum speed was 1200 bps over a switched
It was build with SLT cards and some SMS cards.
is a scan of two manuals with general information of this big and heavy
This is a nice picture of rack and stack 3976