Wow, Pete, 16MB 30-pin SIMMs. I bet they cost a bundle by the standards of
today's per-megabyte pricing! I also bet that a lot of boards won't support
them either, even if they will physically fit.
The AboveBoard cards and the RamPage cards were basically made to add memory
to 80286 and some of the first 80386 machines, so they rarely support memory
speeds faster than 80- or even 100NS. Remember that memory speed is listed
like golf scores, the lower the NS number, the faster the memory. If your
machine has 60- or 70-NS RAM and your memory expansion board does 100-,
120-, 150-, or even worse, then Windows 95 will definitely bitch long and
loud about memory areas of various kinds. Also, the SIMMs in bank zero on
your motherboard is usually what sets the speed of all the rest of the
memory you put into the system.
Compaq machines are often a different kettle of fish, and the bucket is
different depending on which kind of Compaq you're talking about. The
DeskPro 486/33, for example used two 32-bit memory cards into which you
snapped 30-pin SIMM sticks. I think each board could hold either 8, or
maybe even 16 sticks, which needed to be true parity, fast-paging, 80NS or
faster memory chips. Anything else, if it works at all, would give you all
kinds of memory size errors and other types of memory errors. I don't
remember if those machines supported double-sided SIMM modules or not, but
they may have. Other Compaq machines had different memory requirements.
Kingston was one of the leading third-party suppliers of proprietary memory
for Compaq machines of various types and descriptions.
By the way, if any of you guys have, or can get working 4MB base memory
boards or expansion boards for a Compaq DeskPro 386/25 or DeskPro 80386/33
machine, I'm looking for them. They are still available at retail, but I'm
not willing to pay the supplier the $225 plus shipping they want for the 4MB
base memory module.
If you have a '386 or a slow '486 machine, and you're using DOS, or maybe
even Windows 3.1, you might be able to get away with using an Intel
AboveBoard 286 or 386 memory card if you populate it with 80NS DRAM chips.
Now, try finding a complete matched set of 72 of those suckers! We're
talking about the 256K by1Bit variety that those cards used.
Later!
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Brent Reynolds, Atlanta, GA USA
Before they invented drawing boards, what did they go back to.
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