🚀 go-pugleaf

From article <1989Nov14.020457.416@mentor.com>, by mbutts@mentor.com (Mike Butts):
[I'm sure you've all seen the lead-in, or don't care. Anyway, in response
 to "Why would the ENIAC need something as hefty as an 807...]
> 
> Clock drivers, I'll bet.  A professor of mine worked on a 50's
> Univac machine with 807 clock drivers.  ZZZAP!!!

	I'd suspect that your professor worked on a Univac 7900, aka
"Solid State 90" (aka SS80, Cambridge Airforce Computer, UEC, etc).
Originally developed in the mid 50's, and with several later models.
This machine used diode-core logic, which meant that the "clock driver"
_was_ the principle power supply. As I recall, the clock driver provided
3KW. It used six 4cx250's (That's 250 watts of plate dissipation each),
and may have used 807's as _pre_drivers. It also sported a 600 LPM
printer which used octal-based Thyristors (66 of them) as hammer drivers.

	These machines were in use as late as the early 70's, and
were very reliable. I should know, I used to own one :-)

	Anybody caring to hear more about diode-core logic can email
me, but suffice to say that familiarity with this machine served me
well when I later met dynamic NMOS logic...

					Mike

| Mike Albaugh (albaugh@dms.UUCP || {...decwrl!pyramid!}weitek!dms!albaugh)
| Atari Games Corp (Arcade Games, no relation to the makers of the ST)
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