Systems Concepts SC-4 computer

Lars Brinkhoff lars at
Mon Feb 15 11:01:39 CST 2021

Lars Brinkhoff wrote:
> Anyone ever heard of the Systems Concepts SC-4 computer?
> "This is an two's-complement 18-bit machine, with 16 general registers
> and a 16 level priority interrupt system.  Its programming ascpects
> are explained in great detail in the SC-4 Reference Manual, of which a
> draft is enclosed."
> From page 6 here:

Eric Moore wrote:
> You can see some info on the systems (gould SEL) concept line here, but
> looking at that PDF, systems concepts was something different.

Yes, something different.  Systems Concepts was formed by Stewart Nelson
and Mike Levitt, made some early equipment for the MIT AI lab PDP-10
computer, and later the successful SA-10 disk controller compatible with
IBM disks.  In the 80s they went on to make the SC-30M and SC-40
computers which where compatible with DEC's KL10.  But this SC-4
computer was apparently something else.

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