On 9 Sep 99, at 21:08, Mike Wood wrote:

> This started as unable to format a 1g hd, but I noticed that my friend had
> f48meg of ram installed but mem check at boot only reported 40. System is
> an old ctx pentium 75 with a 100mhz overdrive proccessor. Have no idea who
> made the mother board all it says on it is MBD-P66AP2, ctx's website is no
> hellp at all. His 48meg of memory consists of 2 16meg sticks and 4 4meg
> sticks. While trying to find the bad ram things got weird, if I put the 2
> 16s in either end by themselves bios checks 16meg only, if I put them in
> the middle slots, bios says 8meg. I get exactlly the same readings using
> either pair of 4meg sticks, 16 meg if in either end pair or 8 meg in the
> middle pair.

  I believe the answer is found at

http://kb.quantex.com/kbhtml/generic/prdinfo/mbd/ghmbd015.htm

(which I found by doing an AltaVista search on "+P66AP2".  The page indicates
that this is a vendor label on a Gigabyte GA-586AL board....

  Down near the bottom (Notices #2), it says:

> Bank 1 (SIMMS 3&4) supports only single sided SIMMS and does not support
> double sided SIMMS.

  [Things are a little weird, in that I thought I remembered 4MB/16MB/64MB as
single-sided SIMMs and 8MB/32MB as double-sided....]

  [I also notice that, according to the diagram, "Bank 0" consists of SIMMs 5&6,
"Bank 1" of SIMMs 3&4, and "Bank 2" of SIMMs 1&2.  It's entirely possible that
they alos got the distinction between single-sided and double-sided backwards....]


David G

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