Amiga.org

Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: patrik on July 07, 2004, 10:28:10 PM

Title: Static column or page mode zip, how does one tell?
Post by: patrik on July 07, 2004, 10:28:10 PM

Hi everyone.

A friends A3000 has 8MB of fastmem as zips. I tried to find information about the memory-chips (http://www.lilja.vannas.se/~erik/DSCN5635.JPG) to tell wether they are static column or page mode but I didnt find any. So my question is if there is a another way to find what type they are?


/Patrik

Title: Re: Static column or page mode zip, how does one tell?
Post by: Ilwrath on July 07, 2004, 10:52:06 PM

I believe those are 1Mx4 FPM modules.  71C4400 is the base of the part number, and the last digit being 0 is probably indicitive of a FPM part.  (Static column is +2 of the FPM number)  For example a 256K ZIP with part 514256 is an FPM part, and 514258 is an SC part.  The 71C puzzles me, though.

Also, the 514400 is a common 1Mx4 FPM part.  With the base being that similiar, I'd be about 85-90% certain you have FPM RAM.  (70ns access, even  ;-)  )

[edit] - fixed some wording, a typo, and added:
The 714256 is also a FPM part, so 51 or 71 prefix doesn't seem to matter.  I'm still not sure what the C means.  It may have something to do with latency.(?)