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- Newsgroups: comp.sys.ibm.pc.hardware
- Path: sparky!uunet!mcsun!sun4nl!utrcu1!infnews!infnews!waardenb
- From: waardenb@cs.utwente.nl (Jerry van Waardenberg)
- Subject: Re: 1x9 vs. 1x3 memory
- Message-ID: <1992Sep14.104243@cs.utwente.nl>
- Sender: usenet@cs.utwente.nl
- Nntp-Posting-Host: mustang
- Organization: University of Twente, Dept. of Computer Science
- References: <1992Sep9.180601.11141@unislc.uucp> <1992Sep11.164957.5227@ultb.isc.rit.edu>
- Date: Mon, 14 Sep 1992 08:42:43 GMT
- Lines: 43
-
- In article <1992Sep11.164957.5227@ultb.isc.rit.edu>, ajb8886@ritvax.isc.rit.edu writes:
- |> In article <1992Sep9.180601.11141@unislc.uucp>, erc@unislc.uucp (Ed Carp) writes:
- |> >A friend has got a Micronics motherboard that has 1MBx9 SIMMS on it. He
- |> >ordered additional memory from Midwest Micro Peripherals, ostensibly 1x9s.
- |> >When the memory arrived, he discovered that they were 1MBx3s. So, Micronics
- |> >tells him that he can't use 1x3s above 8MB.
- |> >
- |> >He called around several places, and found out that most people are starting
- |> >to sell 1x3s instead. Does anyone know of a reliable supplier of 1MBx9s?
- |> >--
- |> >Ed Carp, N7EKG erc@apple.com 801/538-0177
- |> >"This is the final task I will ever give you, and it goes on forever. Act
- |> >happy, feel happy, be happy, without a reason in the world. Then you can love,
- |> >and do what you will." -- Dan Millman, "Way Of The Peaceful Warrior"
- |>
- |> That's the first I've heard of 1MB*3s. What you're really referring to is
- |> the fact that they use 1mb*4 bit chips instead of 1mb*1bit chips on the sim.
- |>
- |> On an older 1mb * 9 sim, you would have nine discrete 1mb chips.
- |>
- |> On a newer 1mb * 9 sim, you would have two 1mb*4 bit chips (= to 1mb * 8)
- |> + one 1 mb * 1 chip (sometimes they actually use a 1mb * 4 chip here too),
- |> for a total of three chips.
- |>
- |> It should make no difference whatsoever: both types of simms are 1MB * 9 bits,
- |> just packaged differently. The result should be transparent to the computer.
- |>
- |> Alex
- |>
-
- Sorry, but you're wrong! It does make a difference. Older type computers only
- refresh the first column of a memory chip. This works fine if all chips are 1
- Mbit (as the 9-chip 1 MB SIMMs). However, in 4 MB SIMMs, that have their memory
- lined up in 4 columns of 1 Mbit each, only the first column will be refreshed.
- The other columns will lose their data. So the newer 3-chip SIMMs can only be
- used in newer types of computers!
-
-
- Jerry van Waardenberg ______ ____ _____ _____
- Tele Informatics and Open Systems / / / / /_
- Department of Computer Science / / / / -_
- University of Twente, Enschede, The Netherlands / __/_ /____/ _____/
- E-mail: waardenb@cs.utwente.nl
-