The real reason for this thread is to expand Apple imposed Q605/LC475 and IIsi memory limitations by building an adapter card that'll use more modern (faster response times) SIMMS on a sub-mobo memory expansion card that'll address all available RAM Banks at maximum capacity.]

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That would be interesting. The Q605 definitely does at least up to 260 MB of RAM. I know that from experience. And the 4MB on board can probably be replaced with 64MB, so I imagine that machine could go to 256 + 64 = 320MB at a minimum, perhaps more.

The IIsi should go to 128MB. My understanding is that it's essentially a IIci with a microphone jack, so the memory pins should be there for 128MB.