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Socket 5 MOBO Assistance..

I pray this one is riht as I looked it up as well...just want to get your veteran clarification

the 128kx8 32-Pin - http://www.ebay.com/itm/KM681000LP-...517?pt=LH_DefaultDomain_0&hash=item5634507115

Searching for a 64kx8 option for the tag which it says it requires...only finding 28 pin options there...not sure if that will work as it would mismatch the other 16 32-Pin.

You have really helped me to understand this cache shit...I am not as much a dumb shit (still somewhat) about it!
 
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Not what you want, too fat, won't fit in the socket.

Look at this http://www.ebay.com/itm/UM61M256K-1...642?pt=LH_DefaultDomain_0&hash=item2a27f4b79a

That is the package, this is listed as skinnydip but I don't think that is a real type, just an added way to say thin. These are the 8x32 256k chips in the 32-pin DIP package, so just using this as an example.

Here is another example of 8x32 256k 25ns, again, not what you want to get but the package is the same.
http://www.ebay.com/itm/MS62256A-25...816?pt=LH_DefaultDomain_0&hash=item4840c7bf78

You may have to be creative in your search terms on ebay. Static ram, SRAM, cache, 32-pin DIP, 28-pin DIP, 15ns, 20ns, it is confusing but remember you need the thin/skinny DIP package. Look at the chips on your motherboard and compare the width. There is no guarantee that the ebay seller will provide what the pics look like or even what chip type they list.
 
Clearly I need to really pay attention here when getting these chips...

Can I go 28 or 32-pin?

Hopefully I can find someone who can help out with this or point me in the direction of a seller...

For now, I will stick with what I have on board - 256K on Pentirum / 32K on 486 and lots of RAM!
 
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Smack2k said:
Clearly I need to really pay attention here when getting these chips...

Can I go 28 or 32-pin?

Hopefully I can find someone who can help out with this or point me in the direction of a seller...

For now, I will stick with what I have on board - 256K on Pentirum / 32K on 486 and lots of RAM!
Click to expand...

Oh, BTW, those ebay links I posted earlier about 128k x8 are not what you want. At least not the 128k x8 (it says CMOS static and I think it should say CMOS SRAM).
 
orion24 said:
Oh, BTW, those ebay links I posted earlier about 128k x8 are not what you want. At least not the 128k x8 (it says CMOS static and I think it should say CMOS SRAM).
Click to expand...

Cache Sram is static ram btw, both are the same thing for the most part, minus tag comparison logic in some cases. :)

CPU cache is usually nothing more than static RAM. Some CPUs might use dual-ported RAM in order
to parallelize the interfaces between CPU and cache and/or external bus and cache, but that is irrelevant for this situation. Nonetheless , more you know... :jester: LOL!
 
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A "skinny DIP" is 0.300" wide pin center-to-center (the body itself is 0.240" wide without the pins) with pins along the sides spaced on 0.100" centers.

Cache SRAM is usually fairly high speed; 15 nsec. versus 50-120 nsec. for ordinary SRAM.

Here's a 32Kx8
 
The DIP's I have in my P1 are 400mm x 150mm (I measured them myself to be sure...) so what would those be?

Thanks for the info on that last ebay post...my search continues!
 
Smack2k said:
The DIP's I have in my P1 are 400mm x 150mm (I measured them myself to be sure...) so what would those be?

Thanks for the info on that last ebay post...my search continues!
Click to expand...

They should be about 40mm x 7.5mm. Are you sure you measured them correct?
 
Oh dear lord...you are correct...

40mm x 7.5mm is correct....I read the 7.5 wrong and the 400 was supposed to be 40!

WOW, I didnt realize what I had typed there before..

YES, I am working on cache for a 1935 machine!!!

So yeah, 128Kx8 "Skinny Dip" SRAM

What is strange is that some documents list their chips as 400mm....
 
Hey, inches are cool with most of us--the DIP is definitely designed on the basis of the old "three barleycorns, dry and round" (12 poppyseeds).

But when you're out shopping for cache SRAM, pay attention to the speed. Cache SRAM is usually very fast (15 nsec. access time). General-purpose SRAM, which has comparable densities and pinout is anywhere from twice to an order of magnitude slower.
 
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Thanks, same things RJBJR was saying...I just cant find them...shit, I'd take 64kx8 (17 of them) as well...just want to fill the banks up. Even 32Kx8 would get it to 512K total which I guess would be fine for a P1 75MHZ w 128 MB RAM.
 
Well, cache RAM chips aren't as common as they used to be because cache is now on-chip (which is really where it belongs, given the speed). However, Mouser shows that it carries the Cypress CY7C199CN 32Kx8 new for less than $2 each. I believe that they'll work, but double-check the datasheet.
 
Really, the 256kB cache you already have is plenty. You could find reviews but going up to 512k is only going to increase speed a few percent in a handful of programs while making no difference in games and in some cases actually making things slower by increasing memory latency. Unless you are planning to run CAD files that will take hours on a Pentium, you won't be able to tell the different between 256k, 512k, or 1MB cache on a Pentium. Even if you are, you might save a few minutes out of an overnight run. Cache ain't a magic make it fast solution.
 
Cool, nice to hear..

I think for me, being into this hobby, its more of a "its empty, lets fill it" kind of thing..

But I can find it when I find it!

For now, the 256 KB will work!

Thanks
 
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