Well, I went ahead and did another revision of the pre-ADB/PS2 board to fix the DB9 wiring, and added an ADB port, along with a jumper. The idea is to use the jumper to select between pre-ADB and ADB output. This means another 3-4wks before it arrives. I figure even if no one else cares, that board will be "done" and I'll be able to let the project rest. 
I've back burnered the USB version, mainly because it only supports one mouse or one keyboard at a time. That's just kind of unfortunate. Maybe at a future date I can see about some of the alternatives (hardware or software).
As for whether it works on a ROM1 IIgs, I can give it a try. I've got one in the storage room. The ADB project is still currently in the hacked up wires on a hacked up board stage. It's working well enough as a proof of concept, and I'll be working on refining it and adding keyboard support when the new board arrives.
I've back burnered the USB version, mainly because it only supports one mouse or one keyboard at a time. That's just kind of unfortunate. Maybe at a future date I can see about some of the alternatives (hardware or software).
As for whether it works on a ROM1 IIgs, I can give it a try. I've got one in the storage room. The ADB project is still currently in the hacked up wires on a hacked up board stage. It's working well enough as a proof of concept, and I'll be working on refining it and adding keyboard support when the new board arrives.