On 28/04/2004, at 7:54 PM, R. A. Cantrell wrote:
I've just about Chipmunk'd myself blind and cannot get a definitive answer
on some 30 pin simms. They all have 8 OKI 514100A-70SJ chips (20625069A9Z)
I just need to determine the size (meggage) of each stick. Anyone got some
of these or any insight?
Just throwing a bit of info into the list that's useful to me when I have to ID simms - You can google using part of the number and it usually turns up quite a few relevant link, to identify how much storage is on each chip. "514100A" is what I googled for, and the third link I get is a pdf that shows info about each individual chip as:
"This family is a 4M bit dynamic RAM organized 4,194,304 x 1-bit configuration with Fast Page mode CMOS DRAMs."
So to simplify, each individual chip is 4 Million of 1 bit. Since R.A needs "4 Million of one byte", or "4 Million of 8 bits" (both the same thing) to make 4 Megabytes, then 8 lots of those chips is 4Megabytes, which is what they are :)
When googling it helps to try a few different combinations of the first number segment, leaving out the speed (70SJ).
There are quite a few different combinations of chip types, such as 4Mx2, or 16Mx4 and so on. You may for example have a simm with 4Mx2 bit and only 4 chips - which would end up the same size, 4MB - or 16Mx4 chips, and 2 of those, which would be a 16MB simm.
dana -- http://www.danamania.com/
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