On 1999-03-01 [EMAIL PROTECTED] said:
>> Date: Sun, 28 Feb 1999 08:35:09 +0100
>>> The new 4 meg sims have three chips on them whith all the
>>>same part number, these are the sims that don't work.
>>> The 4 MB sims that do work have two chips whith the same part
>>>number and one chip whith a different part number on it.
>>> Well I ran on long enough for now, I think.
>Generally SIMMs with an odd number of chips are parity and those
>with an even number are non-parity and usually cannot be mixed.
I know I have herd that too, the combination that is working is 4 (1 MB {2
chip} 30 pin sims along whith 4 )4MB {3 chip} 30 pin sims for a total of 20
MB.
In cmos there is a parity check disabled or enabled, it is set to
disabled. does this mean I can't use parity memory in it unless I enable the
parity check?
I also tryed 4 (1MB {9 chip} 30 pin sims, these came out of a 286 del
computer. The computer came up and commenced beeping 9 times a pause then 9
times again, I geus from this that it doesn't like the {9 chip} sims. I am
almost sure the {9 chip} sims are parity. Can't say for sure, though.
I was going to buy 8 new sims, and put in a matched set, but I didn't know
what kind to buy, so I am trying different kinds of memory to see what
works. Fortunately for me I have sets of 4 so I can try 4 at a time.
I think, I can safely buy 8 non parity 4 MB sims for it. That's if the {9
chip} sims from the del computer are parity, rite?
Some thing else in the cmos is a check sdram or some thing like that, I
looked on the mother board and all that's there are the 8 30 pin sim slots
in 2 banks of 4, and a bunch of the centipeed like chip sockets, for external
cache I geus. I can get the non parity sims for $7.95 US plus shipping, I
geus the only thing I can do is to get em and try em, and hope and pray they
work.
>Some motherboards demand parity; some do not. Also IBM
>motherboards of the PS2 vintage especially seemed to demand IBM
>SIMMs. If these are 30 pin and not 72 (72 have a notch
>approximately in the middle, 30 has no notch and are somewhat
>shorter) chances are they are not EDO. Some mid-90's motherboards
>had slots for both sizes; so you could mix them. Otherwise you
>could not. Some 72 pin motherboards allow non-parity and some
>parity MB allow you to set the CMOS to skip parity check, allowing
>the use of non-parity SIMMs. Also all SIMMs come in a variety of
>speeds, such as 60, 70, and 80 nannoseconds, usually the slowest
>sets the pace, if mixed which is not an optimum situation either.
>Generally it is not a good idea to mix different kinds of SIMMs or
>different speeds, but sometimes you can fudge it. The box that I am
>writing this on has mixed 30 pin parity and 72 pin non-parity SIMMs,
>but I get an occational memory address fault; such as in Tom's Root
>Boot Linux, which will not load on this box, but will on another
>with uniform SIMMs.
>One other thing, it is my impression that 30 pin SIMMS have to be
>loaded in sets: 4 for parity and 2 for non-parity, but I may have
>the numbers wrong, definitely in pairs. It's been years since I
>built this box, and I am about ready to retire it. It seems that I
>needed a set of 4 1-MEG parity SIMMs to get started then, but I was
>very green then and not much better now; so that may be incorrect.
>Memory is so cheap these days that it is most certainly cheaper to
>buy a properly matched set than to spend the time to match a group
>of orphan SIMMs, unless you have both the expertise and a lot of
>spare time (and a little luck).
>This is all about PC SIMMs, I have no idea what MAC uses.
>End
>Peace
>Dale Hoogeveen Email: [EMAIL PROTECTED]
>Home site: http://www.net-info.com/~dutch
Thanks!
Pete
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