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Article #2841Re: VERY LARGE main memories: crypt
From: robison
Date: Sat, 13 Sep 1986 16:04
Date: Sat, 13 Sep 1986 16:04
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1215 bytes
For the curious, my freshman physics text[1] contains the estimate:
No. of nucleons in known universe ~ 10^80
This would be ~ 2^266. Even if a memory this size could be built, there
is still the problem of finding enough power for it. There are quantum
limits for the minimum power of switching devices[2].
[1] *Mechanics*, Kittel, Knight, Ruderman, Helmholz, and Moyer.
(2nd edition, 1973)
[2] "Physics of Computational Systems, " in *Introduction to VLSI Systems*,
Mead and Conway, 1980.
Arch D. Robison
University of Illinois at Urbana-Champaign
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!mnetor!seismo!caip!clyde!burl!ulysses!mhuxr!mhuxt!houxm!ihnp4!inuxc!pur-ee!uiucdcs!uiucdcsb!robison From: robison@uiucdcsb.CS.UIUC.EDU Newsgroups: net.arch Subject: Re: VERY LARGE main memories: crypt Message-ID: <5600054@uiucdcsb> Date: Sat, 13-Sep-86 12:04:00 EDT Article-I.D.: uiucdcsb.5600054 Posted: Sat Sep 13 12:04:00 1986 Date-Received: Sun, 14-Sep-86 20:12:17 EDT References: <15505@ucbvax.BERKELEY.EDU> Lines: 17 Nf-ID: #R:ucbvax.BERKELEY.EDU:15505:uiucdcsb:5600054:000:569 Nf-From: uiucdcsb.CS.UIUC.EDU!robison Sep 13 11:04:00 1986