Systems Concepts SC-4 computer
mooreericnyc at gmail.com
Mon Feb 15 09:25:10 CST 2021
Yes, SEL was referred to as systems, but like I said that PDF does not seem
to be referring to an SEL product. Probably just a coincidence, but maybe
On Mon, Feb 15, 2021, 9:16 AM Bill Degnan <billdegnan at gmail.com> wrote:
> A clue from Dan Roganti's web page or did "they" used to refer to SEL as
> "Systems" back then and are you saying that the SC=4 is an SEL product?
> (Systems [engineering labs] - Concept  ?
> On Mon, Feb 15, 2021 at 10:08 AM Eric Moore via cctalk <
> cctalk at classiccmp.org> wrote:
>> You can see some info on the systems (gould SEL) concept line here, but
>> looking at that PDF, systems concepts was something different.
>> On Mon, Feb 15, 2021, 4:47 AM Lars Brinkhoff via cctalk <
>> cctalk at classiccmp.org> 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. Below are times for some typical instructions.
>> > Add word on stack (not top word) to general register 1.5 us
>> > Multiply general register by memory word 6.2 us
>> > Jump 750 ns
>> > Push and Jump 1.5 us
>> > Compare Immediate 750 ns"
>> > From page 6 here:
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