core memory
in [Design]
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From: Jan Panteltje on 6 Dec 2009 06:45 On a sunny day (Sat, 05 Dec 2009 20:10:52 -0500) it happened PeterD <peter2(a)hipson.net> wrote in <l31mh5p3e6qiuildgmj5gkestukvh1piij(a)4ax.com>: >I still have a PDP 11/05 core unit hanging on my wall along witg a >disk platter and a few other things from that machine. I have a DVD+R hanging on the wall, shiny side front, looks nice, stores more data. Do not remember what is on it.
From: Baron on 6 Dec 2009 12:19 John Larkin wrote: > On Sat, 05 Dec 2009 13:33:53 -0800, Joerg <invalid(a)invalid.invalid> > wrote: > >>John Larkin wrote: >>> Testing some FTP stuff, threw up some test files... >>> >>> ftp://jjlarkin.lmi.net/Core_304bits.jpg >>> >>> ftp://jjlarkin.lmi.net/Core_4K.jpg >>> >>> ftp://jjlarkin.lmi.net/Core_4Kdetail.jpg >>> >> >>Here I must confess that I cruelly re-purposed some of those. People >>made matrix keyboards with them because the hysteresis provided an >>easy way to avoid contact bounce (you had to reset the cores before >>the next keystroke was accepted). So, snip, snip, snip, clicker, >>clicker, into a bag and gave them away. Back in the 70's keyboards >>with German layout were very expensive, some had odd interfaces, and >>buying 30-40 push button switches was a lot cheaper. You could buy >>them with a step and then glue a label onto the lower step. I think >>they still make them. > > There were some jukeboxes that used core memory - BIG cores, one per > record - to remember which records had been selected/paid for to play. > > John Yep ! Seeberg or was it Seaberg made them. Bloody great big block ! -- Best Regards: Baron.
From: Sylvia Else on 6 Dec 2009 22:07 John Larkin wrote: > Testing some FTP stuff, threw up some test files... > > ftp://jjlarkin.lmi.net/Core_304bits.jpg > > ftp://jjlarkin.lmi.net/Core_4K.jpg > > ftp://jjlarkin.lmi.net/Core_4Kdetail.jpg > > John > > Many a poor woman's eyesight in the third world ruined making those, I'll be bound. Sylvia.
From: Rich Grise on 6 Dec 2009 21:23 On Mon, 07 Dec 2009 14:07:15 +1100, Sylvia Else wrote: > John Larkin wrote: >> Testing some FTP stuff, threw up some test files... >> >> ftp://jjlarkin.lmi.net/Core_304bits.jpg >> >> ftp://jjlarkin.lmi.net/Core_4K.jpg >> >> ftp://jjlarkin.lmi.net/Core_4Kdetail.jpg >> > Many a poor woman's eyesight in the third world ruined making those, I'll > be bound. There is nothing about just looking at stuff, even up close, that can damage your eyes. If you have misaligned lenses, that can cause eyestrain (I know this because I got some $10.00 drugsore bifocals, that weren't aligned with my eyes, and I got terrible eyestrain. I took them off, and my eyes were fine, albeit I had to buy another $10.00 pair of old-guy glasses.), but it won't cause permanent harm. Not even reading by candlelight. "You'll ruin your eyse!!! =:-O" Not true. And masturbation doesn't make you go blind, or make hair grow on the palms of your hands. ;-P It's usually a terrible shock to people that reach their adulthood and find that not _EVERYTHING_ your Mom said is true. ;-) (Mine usually was right - my Mom was an unusually wise woman.) I once worked at Control Data Magnetic Peripherals Division, and they had about two dozen people winding read/write heads, admittedly under binocular microscopes. Hope This Helps! Rich
From: Jan Panteltje on 7 Dec 2009 07:01
On a sunny day (Sun, 06 Dec 2009 18:23:57 -0800) it happened Rich Grise <richgrise(a)example.net> wrote in <pan.2009.12.07.02.23.55.408432(a)example.net>: >On Mon, 07 Dec 2009 14:07:15 +1100, Sylvia Else wrote: >> John Larkin wrote: >>> Testing some FTP stuff, threw up some test files... >>> >>> ftp://jjlarkin.lmi.net/Core_304bits.jpg >>> >>> ftp://jjlarkin.lmi.net/Core_4K.jpg >>> >>> ftp://jjlarkin.lmi.net/Core_4Kdetail.jpg >>> >> Many a poor woman's eyesight in the third world ruined making those, I'll >> be bound. > >There is nothing about just looking at stuff, even up close, that can >damage your eyes. If you have misaligned lenses, that can cause eyestrain >(I know this because I got some $10.00 drugsore bifocals, that weren't >aligned with my eyes, and I got terrible eyestrain. I took them off, and >my eyes were fine, albeit I had to buy another $10.00 pair of old-guy >glasses.), but it won't cause permanent harm. > >Not even reading by candlelight. "You'll ruin your eyse!!! =:-O" Not true. > >And masturbation doesn't make you go blind, or make hair grow on the >palms of your hands. ;-P > >It's usually a terrible shock to people that reach their adulthood and >find that not _EVERYTHING_ your Mom said is true. ;-) (Mine usually was >right - my Mom was an unusually wise woman.) > >I once worked at Control Data Magnetic Peripherals Division, and they had >about two dozen people winding read/write heads, admittedly under >binocular microscopes. Exactly! > >Hope This Helps! >Rich > > |