15 Feb
2021
15 Feb
'21
7:16 a.m.
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/…