Well, it sounds like trag's project would be mapped into the address space and not need a driver in order to be accessed, and there's already some RAMdisks out there. This is more a stepping stone to other projects, mostly pure software based. There's still a lot of pieces to put together before something like this would be terribly useful loaded from a declrom. What would be useful in that regard is a simple nubus dev card that contained an easily programmable declrom, and some LEDs controllable by mapped registers or something along those lines. Maybe a cheap amount of storage of some sort (a small amount of EEPROM, or just ram, or something). Just as a learning tool for writing a declrom and an associated driver capable of accessing resources on its own card.

In the course of figuring this out, I've got some ideas for some tools that would be helpful for working in this space in the future, so that's probably my next step.

It has been pretty enjoyable doing all this on the pb540c so far. The ability to use wifi to back up progress as it is made (I don't trust ~20yr old hdd's), and being able to use an external monitor on occasion. The 2nd head is pretty useful for development, where I can have macsbug up on one screen and have the code up on another.