IBM Series/1

William Donzelli wdonzelli at
Fri Aug 2 22:49:38 CDT 2019

> Given the little literature I've seen on the subject, and also the
> amount of real-time control computers that I've seen in labs being
> dismantled... I'd say that it was probably a late IBM response to PDP-11
> and HP 21xx and 1xxx process control computers.

That would be correct - and is even shown in the period advertisements
from IBM. In keeping with the DEC philosophy, the S/1 was a very open
system,and in the mid 1970s, IBM tried to cultivate a sea of third
party vendors, as there was for other minicomputer makers at the time.
Some ventured in, but the third party market really never grew much.

The S/1 was not IBMs first minicomputer by any metric. In process
control, for example, the System/7 predated the Series/I, and the 1800
family before that, and the 1710 before that. A System/360 could also
do realtime process control using something called a 1070, but very
few were used this way.


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