Transporting an LGP-30
cclist at sydex.com
Fri Dec 30 14:14:24 CST 2016
On 12/30/2016 09:49 AM, Paul Koning wrote:
> I have an old set of lecture notes I'm translating, for a course on
> computer design from 1948, which discusses various memory types. Not
> core memory, that came later. But it mentions drums, and theorizes
> that those might be operated at 60,000 rpm... I'm not sure where
> that optimism came from. Perhaps because the author was a
> mathematician rather than a mechanical engineer?
CDC ADL back in the late 1960s was testing a prototype high-speed drum
for the STAR--100K RPM in vacuo, ISTR. Probably a Jim
Thornton-inspired scheme. I do recall Neil Lincoln mentioning that the
observation window became coated with drum material in the first few
The idea was a very fast paging store. That and the SCROLL tape/disk
device are two that come to mind.
Anent the LGP30--some drums were equipped with several heads spaced
around the same track to cut down on latency.
Logic need not be vacuum-tube or transistor--I recall the Univac Solid
State machines that used magnetic core as well as the Parametrons of NEC.
Drum machines persisted a bit longer than one would expect; e.g., the
Litton 1601 was produced in the early 70s.
Technical reference manual:
Bit serial architecture, of course. An odd bird, if there ever was one.
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