15 Feb
2021
15 Feb
'21
2:46 a.m.
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/…
15 Feb
15 Feb
7:07 a.m.
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/…
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/…
7:25 a.m.
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/…
16 Feb
16 Feb
12:54 a.m.
On Mon, 15 Feb 2021, Eric Moore wrote:
Yes, SEL was referred to as systems, but like I said
that PDF does not seem
I still have problems seeing SEL referred to as something different as
"Standard Elektrik Lorenz" (later part of ITT) who made for example the
ER56...
Christian
8:40 a.m.
YEs, SEL purchased by Gould, was Systems Engineering Labs - Their
early systems were interesting in the way the I/O bandwidth was much
highter than the compute capability. Perfect machine for data
collection, and they were sold to many labs. THis continued with their
first 32 bit machines. Later, before and after purchase by Gould,
they had a more balanced architecture but they sure sucked up power.
bob
On Tue, Feb 16, 2021 at 3:55 AM Christian Corti via cctalk
<cctalk at classiccmp.org> wrote:
On Mon, 15 Feb 2021, Eric Moore wrote:
Yes, SEL was referred to as systems, but like I
said that PDF does not seem
I still have problems seeing SEL referred to as something different as
"Standard Elektrik Lorenz" (later part of ITT) who made for example the
ER56...
Christian
11:45 a.m.
Or Sugano Electric Laboratory, aka SEL
On Tue, Feb 16, 2021, 2:55 AM Christian Corti via cctalk <
cctalk at classiccmp.org> wrote:
On Mon, 15 Feb 2021, Eric Moore wrote:
Yes, SEL was referred to as systems, but like I
said that PDF does not
seem
I still have problems seeing SEL referred to as something different as
"Standard Elektrik Lorenz" (later part of ITT) who made for example the
ER56...
Christian
15 Feb
15 Feb
9:01 a.m.
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:
http://people.csail.mit.edu/saltzer/Multics/MHP-Saltzer-060508/filedrawers/…
Eric Moore 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.
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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7 comments
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participants (5)
-
billdegnan＠gmail.com -
bobsmithofd＠gmail.com -
cc＠informatik.uni-stuttgart.de -
lars＠nocrew.org -
mooreericnyc＠gmail.com