29 Apr
1998
29 Apr
'98
5:26 a.m.
William Donzelli:
I do not think the Cray-1s used 10K ECL - I believe
they were custom parts
and were faster (10K gates have a delay around 2 nS). Only four types of
chips were used in the whole beast - I think two were OR/NOR gates, one
was a flip-flop, and the other RAM.
It is some years since I looked at the Cray 1 in the Deutches Museum in
Muenchen (Munich), but I distinctly recall seeing lots of 10xxx chips in
it. I remember I had just been given a board from the CPU of a Cyber
two-hunderd-and-something (?) that had been thrown out by Muenchen
Technical University a few months earlier, and this board has lots of
100xxx chips on it.
Philip.
29 Apr
29 Apr
12:19 p.m.
It is some years since I looked at the Cray 1 in the
Deutches Museum in
Muenchen (Munich), but I distinctly recall seeing lots of 10xxx chips in
it.
Maybe you are correct, but I am skeptical. 10K ECL just is not that fast
(2nS typical gate delay, 2.9nS worst case). The Cray-1s had only a 12.5nS
clock! 100K was just on the horizon at the time, so it was out of the
running, but MECL III was around at the time, and was a bit faster.
Perhaps you looked at a board from a Cray SSD (Solid state Storage Device
- basically a memory expansion)?
I remember I had just been given a board from the CPU
of a Cyber
two-hunderd-and-something (?) that had been thrown out by Muenchen
Technical University a few months earlier, and this board has lots of
100xxx chips on it.
Cyber 203 or 205.
William Donzelli
william(a)ans.net
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Philip.Belben＠powertech.co.uk -
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