Path: utzoo!attcan!uunet!husc6!bu-cs!buengc!bph From: bph@buengc.BU.EDU (Blair P. Houghton) Newsgroups: comp.lsi Subject: Re: memories Message-ID: <391@buengc.BU.EDU> Date: 9 Jul 88 20:44:32 GMT References:Reply-To: bph@buengc.bu.edu (Blair P. Houghton) Followup-To: comp.lsi Organization: Boston Univ. Col. of Eng. Lines: 29 In article grzybows@math.rutgers.edu (grzybowski) writes: > >What about really high capacity memories? Look up "Bloch Line Memory" in current and ancient literature. I heard about it only a few months ago, and the guy who gave the seminar said something about 300Meg per chip; 'course, your mileage may vary :-) It's a variant on bubble-memories (still the highest-density working technology) in which, rather than the existence of a domain wall being the "bit", one puts half-twists in the wall and calls that a "bit". The bubbles get stretched out like rubber bands, and twisted like screwy macaroni. Come to think of it, a thick rubber band might be a good visual aid for teaching that these things are indeed stable states of the domain wall...not physically parallel, maybe, but visually mnemonic. Actually, that number worries me; check it out; my brain cells have been ASL for a while, and I don't have my notes from the lecture. Still, with the Mil running all over themselves, and the Fed running down the Japanese, trying to get 1MB DRAM up to speed, a little slow, para-serial Library-storage device may be a kick in the pants... --Blair (p.s. old 6502 programmers know what ASL is.)