Whoops... read LEO III for LEO II. LEO II used tubes(valves) and mercury
delay lines etc.
Roger Key
I began progamming an IBM 360 model 40 in 1966, with the then new OS360
operating system. Previously IBM had started with a model 30 with a DOS
operating system - machine and operating system were pretty crude at that
time.
I remember thinking that the IBM360/40 was a backwards step from my
previous systems - I had been programming since 1962 for LEO Computers, a
British company, with their LEO III and subsequently LEO 326, both
multiprogramming systems. The LEO II was their first model with transistors
and used real core memory; the core memory was made up small core rings
with three (I think) wires running through each core, made up into a
physical cube. It was probably the best commercial computer made at that
time, but only affordable by large companies - LEO made approx. one per
month.
Roger Key, Copenhagen
Marc Lawrence wrote:
> James N. McBride [mailto:jnmcbr@xxxxxxx] wrote:
> I'm not sure but think the 360 was introduced about 1964. As
> I recall there were several versions of it over the years. I
> know we upgraded several times. /jim
>From http://www.wikipedia.org/wiki/System/360
"System/360 (or S/360) is a computer system family announced by
IBM on April 7 1964."
There's more there, with a few links scattered amongst the text.
Cheers
Marc
Sydney, Oz
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