Thread View: alt.folklore.computers
3 messages
3 total messages
Started by Ralf....
Sat, 29 Sep 1990 11:09
Re: Turning the thing off (was Re: BESM-6
Author: Ralf....
Date: Sat, 29 Sep 1990 11:09
Date: Sat, 29 Sep 1990 11:09
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In article <1990Sep2...@ap.co.umist.ac.uk>, r...@ap.co.umist.ac.uk (bob nutter) wrote:
}Yeah, apart from the power supply storing charge, those dynamic RAM chips can
}hold data for a long while too, often a couple of minutes, which is enough to
A couple of seconds I can believe, but no way minutes....
}confuse the user who just hits reset or switches on/off quickly, and then
}wonders why the machine is still buggered. I seem to remember Texas selling
}4ms (not 2ms) refresh chips. I bet they just tested them. Do they still reduce
}the RAM refresh time on PC's to speed them up?
Yep. My previous computer ran fine with a 106ms refresh cycle (IBM PC's
default to a 1.8ms refresh cycle). My current system is running without a
hitch on a 26ms cycle.
--
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Re: Turning the thing off (was Re: BESM-6
Author: te... Terry Kennedy Operations M...
Date: Sun, 30 Sep 1990 21:04
Date: Sun, 30 Sep 1990 21:04
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In article <270480f6@ralf>, Ralf....@B.GP.CS.CMU.EDU writes: > In article <1990Sep2...@ap.co.umist.ac.uk>, r...@ap.co.umist.ac.uk (bob nutter) wrote: > }Yeah, apart from the power supply storing charge, those dynamic RAM chips can > }hold data for a long while too, often a couple of minutes, which is enough to > > A couple of seconds I can believe, but no way minutes.... In the days of S-100 systems, a company called TDL made 16Kb memory cards which they named the Z16. These boards used "pseudo-static" (their term, not mine) RAM chips called SEMI 4200's. These chips were *huge* (physically), even for their day. I had two IMSAI systems, one with disk and one without. Since it was a real pain to load software from paper tape, I developed the habit of plopping a Z16 into the disk system, loading the program, powering off the system, and moving the board to the diskless machine. Once installed there, I'd power it on, load the starting address and hit run. Worked like a champ - and you had up to about 15 minutes to get the board moved over before bit rot set in. My theory is that the RAM chips were dynamic, but had built-in refresh cir- cuitry, and that (being dynamic) they pulled very little power, so the bypass caps on the board would keep them running for a long time after power was re- moved. Terry Kennedy Operations Manager, Academic Computing terry@spcvxa.bitnet St. Peter's College, US te...@spcvxa.spc.edu (201) 915-9381
Re: Turning the thing off (was Re: BESM-6
Author: huo... Kauto Huopio OH5LFM
Date: Mon, 01 Oct 1990 00:52
Date: Mon, 01 Oct 1990 00:52
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In article <270480f6@ralf> Ralf....@B.GP.CS.CMU.EDU writes: > In article <1990Sep2...@ap.co.umist.ac.uk>, r...@ap.co.umist.ac.uk (bob nutter) wrote: > }Yeah, apart from the power supply storing charge, those dynamic RAM chips can > }hold data for a long while too, often a couple of minutes, which is enough to > A couple of seconds I can believe, but no way minutes.... My brother has an Amiga 500, and he has one odd pinball game which just starts playing digitized laughing if Ctrl-Amiga-Amiga (the amiga Ctrl-Alt-Del) is pressed. When one turns the machine off, waits around 20 secs and turns it again on..the screen is gone but the laughing continues. Only over 30 secs seems to be enough to clear the machine completely.. --Kauto -- ****************** Kauto Huopio (huo...@kannel.lut.fi) ********************** *US Mail: Kauto Huopio, Punkkerikatu 1 A 10, SF-53850 Lappeenranta, Finland * *****************************************************************************
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