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@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@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 > > >
