Well

Additionally, I realized for my mod, a full 260MB is being recognized, which means the builtin 4MB is still being seen with the same configuration value as the 128MB SIMMs. Now I'm really wondering why it ever was the original value.

Click to expand...

That is truly cool. It would be worth getting some of Doug's SIMMs just to use your firmware modification and get the 72 pin SIMM Quadra family to their full capacity.

I'm trying to stick to a strict, "Only buy it when you are ready to actually use it" policy right now, so I won't be doing that until I clear other projects, like the PEX DIMM. Little League baseball season has started up again...

In case you run out of things to do.... You might take a look at VRAM limitations in some of these machines. I think that may be more closely tied to the hardware, but then, I would not have guessed that you could fix the RAM limitation in firmware.