It sounds like you need 72-pin PARITY SIMMs.  A "normal" 72-pin non-parity
SIMM is designated as a 1Mx32 while a parity SIMM is designated as a 1Mx36.
 These SIMMs are more rare than non-parity SIMMs and you will probably have
to pay more for them.  You'll probably have to go to one of the bigger
memory dealers to find them.  Make sure that you ask for Fast-Page-Mode
(FPM) parity 72-pin SIMMs and you should be OK.

At 09:57 PM 12/9/98 -0500, you wrote:
>Hi everybody, I've got a 486DX-75 with an IBM 486 Blue Lightning System
>Board. I've got 8 megs of RAM and I'd like to increase my RAM to 16 megs.
>According to the manual I need two 4 meg SIMMS specified as 1MX36
>single density SIMM modules. I bought two 4 meg, parity 30 pin SIMMS
>(4MX9) and the pin arrangement doesn't seem to match my mother board
>and I sent them back. The new SIMMS had one row of 30 pins, and the
>mother board looks like it needs a SIMM with two in line pin segments with
>36 pins in each segment with a small space(about 1/4") between the two pin
>segments. At this point I'm thoroughly confused and my questions are.

         The PCBUILD web site always needs good submissions.  If
          you would like to contribute to the website, send any
               hardware tech tips or hardware reviews to:
                           [log in to unmask]