For the record, I really hate wrestling SIMMs ... especially when the slots are placed in such a way that tipping one SIMM makes it bump into other components. *grumble* I suspect that I am not unusual in this. Got to repair a fingernail now.
An update to my previous entry: now I'm even more confused. I yanked all four SIMMs and started trying the DIMMs by themselves. Not only do none of them show their full capacity during POST, but at least one seems to be smaller by itself than in the presence of other RAM.
With 32MB of SIMMs installed, the old DIMM labelled 64MB brought the total RAM to 80MB. So it was labelled 64MB but acted like it was only 48MB. By itself, with the SIMM slots empty, only 32MB is detected. WTF?
I got funny results from a couple of other DIMMs as well, before headache and fatigue stopped me. Later, unless some magical decoder ring shows up, I'm going to make notes on index cards for each SIMM I've got, listing how large various motherboards think the SIMM is, with and without additional memory installed. But it seems to me it shouldn't be this complicated.
I feel like such a dinosaur. I'm missing the days when nearly everyone used 1-bit wide chips and as long as you picked ones that were fast enough the only hard part was not bending the pins when inserting or removing the chips.
Are wrestling SIMMs fixed?
I thought I'd heard of issues regarding mixing DIMMs and SIMMs back when they started making PCs with both types of socket, but that may have been something else. Sadly, I haven't been following H/W standards very closely- last time I did any system building was about 4 or 5 years ago :P
(as for fitting SIMMs, I often found myself worrying about breaking the damn things)
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Bah I'm a little too buzzed to find a good reference link that actually explains this WELL... good luck
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(I'll still want to arrange this RAM into (some of) the machines I've already got though, 'Cause even with a really spiffy machine, I'll keep auxilliary workstations in other parts of the house. But yeah, it'll make using these DIMMs seem a bit lower-priority.)