I tried a set of four 4MB PAL 30-pin SIMMs from a Mac II in a couple PCs years and years ago. The 386 PC recognized all 16MB and booted. The 486 PC hung up during the POST.
Interesting! Maybe the 486's BIOS was actually trying to put the chips into test mode during the RAM test or something, and the PAL was blocking it...either that or the PAL screwed up the timings or something.
- Then there are (4) SIMMs that have no brand name... the chips have a stylized "MT" logo and are numbered 4010240J-7. Guessing these are 70ns. Hopefully that means they're bigger than 1MB...
- Also found (4) branded "KMS" (Kelly Micro Systems?) and the model number looks like KMA-000/FX. They are 80ns. Not sure what size they are. Eight Goldstar GM71C1000J80 chips on each.
- Finally, there's a Texas Instruments TM024EAG8, but that looks like it might be a 100ns chip, and therefore probably a LaserWriter IINTX upgrade.
Hmmm...could the number actually be something like MT4C10240J? I can't find very many datasheets for that though. MT4C1024 would be 1Mb chips implying a 1 MB SIMM. However, I'm not sure about the extra 0 at the end. Agreed about how the 7 probably means 70 ns.
GM71C1000 would be a 1Mb chip, so 1 MB SIMMs.
I'm having a harder time with the TI part number, but that might just be because I'm tired
