Systems Concepts SC-4 computer

[Eric Moore]

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
not.

-Eric

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 [4] ?
>
> Bill
>
> On Mon, Feb 15, 2021 at 10:08 AM Eric Moore via cctalk <
> cctalk at classiccmp.org> wrote:
>
>> http://mnembler.com/ragooman/computers_mini_products.html
>>
>> You can see some info on the systems (gould SEL) concept line here, but
>> looking at that PDF, systems concepts was something different.
>>
>> -Eric
>>
>>
>> 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:
>> >
>> >
>> http://people.csail.mit.edu/saltzer/Multics/MHP-Saltzer-060508/filedrawers/141.graphics-system/Scan%203.PDF
>> >
>>
>