Gavin wrote:

>The 930 CPU ran at a whopping 8MHz, which was pretty good considering that
>a series 70 was something like 1 or 2Mhz I believe.

The Series 64/68/70 ran at 13.3MHz (75ns microcycle time). It did this by
using emitter-coupled logic (ECL), which is expensive, power-hungry and
difficult to work with. ECL is used today, but typically in circuits that
run at several GHz, primarily in communications equipment -- see, for
example, <http://www.mot-sps.com/logic/1330_firstpg.html>. ECL is also
used to "glue" subsystems together in fast microprocessor-based
computers, since it offers processing delays of less than 500ps.

-- Bruce


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