We used an Ultra 5 as a webserver at a very old job, and I managed to score an Ultra 5 and Sun Blade 100 that I plan on messing around with.
A usb3sun works great.
None of the USB keyboards I tried worked. Only a Sun Type 6 USB keyboard worked.
These videos cover both the Dremel-old-chip-attach-new-battery and replacement NVRAM approaches:
# 80:8:0:20:c0:ff is the MAC address you're setting, change accordingly # i've tried this and it works ok set-defaults ok 1 0 mkp ok 80 1 mkp ok 8 2 mkp ok 0 3 mkp ok 20 4 mkp ok c0 5 mkp ok ff 6 mkp ok ee 7 mkp ok 0 8 mkp ok 0 9 mkp ok 0 a mkp ok 0 b mkp ok c0 c mkp ok ff d mkp ok ee e mkp ok 0 f 0 do i idprom@ xor loop f mkp