grzybows@math.rutgers.edu (grzybowski) (07/08/88)
Is it true that there are megabyte RAMs on the market? Are there any nonvolatile memories of large capacity? What about really high capacity memories?
bph@buengc.BU.EDU (Blair P. Houghton) (07/10/88)
In article <Jul.8.08.47.30.1988.7182@math.rutgers.edu> 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.)
d85-per@nada.kth.se (Per Hammarlund) (07/11/88)
Does anybody have any good references to books/papers on Bubble memory? /Per Hammarlund
grzybows@math.rutgers.edu (grzybowski) (07/15/88)
Who produces the 250 Mb bubble memories?
(I am posting this question, because I cannot reach some respondents
by regular email).
dougf@wega.Caltech.Edu (Doug Freyburger) (07/16/88)
In article <Jul.14.15.32.28.1988.21380@math.rutgers.edu> grzybows@math.rutgers.edu (grzybowski) writes: >Who produces the 250 Mb bubble memories? And if these beasts exist in the commercial realm: does anyone produce disk-on-a-chip controller cards and/or software for them running on any of the common buses and O/Ss? Even at "Bernoulli Box" access speeds these make laptops capable enough for a huge market. dougf@wega.caltech.edu Douglas J Freyburger Caltech 206-49 Pasadena, CA 91125 (818)356-2913
bph@buengc.BU.EDU (Blair P. Houghton) (07/16/88)
In article <Jul.14.15.32.28.1988.21380@math.rutgers.edu> grzybows@math.rutgers.edu (grzybowski) writes: > >Who produces the 250 Mb bubble memories? >(I am posting this question, because I cannot reach some respondents >by regular email). > So far as I remember, nobody. All of it is physics research as yet, and there are probably only half a dozen of these working now. --Blair