1. It's possible to make a cache board I think, just need to find the correct cache chips. Someone made detailed scans of the cache module here, but no-one's done this yet. It would require tracing out the PCB and making gerber/PCB design files to get some replacements made up.
from what i can see, it shouldn't be so hard, but it would be so much easier if i could get one of those boards (even if it doesn't work) to see how it's connected, also i should see the chipset pin configuration
2. Yeah it looks like it, the two versions of the board that I can see both look the same with the same components fitted around the slots. I think mine is the 4x 30-pin & 2x72-pin one but it's not a mod I'd try personally, you'd have to be fairly careful when desoldering but they're large through hole parts and I've swapped out 30-pin stuff on other PCBs easily enough before.
the thing is that i have a lot of EDO memory sticks, and these didn't work in my m919 (it seems that there are 2 revisions of the chipset) but few and low capacity FPM modules (4MB and 8MB)
I think that should be as simple as taking out the 4 simm30 slots and put the 2 extra simm72 slots, but i don't have any idea if that's enough, maybe i need to put some extra components
Ohh, the humanity 😢
386SX 25-C3 800-P3 900-Atom 1.6-C-D 2.13-P4 2.26-P4HT 3.0-P-DC 1.6-AFX 2.6-FX 3.3