It's a Sonnet Encore/ST G4 (Part #SG4-1400-2M), which from what I've read, only requires a firmware patch, which it seems like it has, since it is booting... if there's an extension I can drop in the System Folder lmk what I've missed in my research!. FWIW, it has:
ROM Revision: $77D.45F6
Boot ROM Version: $0004.28f1
I'm booting into both the MacOS9Lives & Instant DAW distributions. I've been booting from optical media when I was installing different versions of OSX, when I couldn't seem to boot off OS9 from my hard drives, and when I would experience multiple frequent hangs of a fully-booted OS9. I also booted from optical media (or tried to) while going through 3 bad/incompatible video cards in a row (the 9800 it shipped with, and 2 Radeon 9000s) as I found the installer - when it would boot - would give me a useable video signal more reliably than when booting from hard drive, so bottom-line, the boots from optical were for debugging.
I recently replaced the battery on the mainboard, as it wasn't retaining date/time when power was disconnected, but that behavior persists so starting to seem like a mainboard issue. If I can get the AHT to run, maybe I could say for certain.