Currently, it looks like this:
I replaced the 15GB Seagate drive in the Sun Blade 100 with an old 160 GB Western Digital drive that I used to use with Linux. It won’t see the full 160 GB of it but 127 GB instead because it’s Ultra ATA/66 MHz. That’s okay. It’s a lot better than the smaller drive.
I have yet to figure out how to fix the IDPROM issue. Despite my years as a Mac user during the late PowerPC era, OpenBoot eludes me greatly. It’s the same basic firmware, but I can’t grok it very well. However, I wound up installing Solaris 10 from a x86 VM because the Sun lacks a DVD drive. It did make installation easier once I figured out Jumpstart enough to do a network install over a dedicated Ethernet port on the PC that’s hosting the VM. Networking works but I have to manually configure the connection to match what the Sun thinks the Ethernet port is…