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.

• Raspberry PI mouse works
• Moonlander works
• Small Rii media keyboard works, but the mouse doesn't
• Apple Magic Keyboard doesn't work

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:

• https://www.youtube.com/watch?v=ZDlt4b_pqno
• https://www.youtube.com/watch?v=k4QPBCS7BL8

• New NVRAM chip with battery: https://forum.vcfed.org/index.php?threads%2Fsun-ultra-5-nvram-replacement-trouble.1248448%2F
  • eBay: https://www.ebay.com/sch/i.html?_trksid=p2334524.m570.l1313&_nkw=M48T59Y-70PC1d&_sacat=0&_odkw=M48T59Y-70PC1
  • Update: I tried the 70PC1D. The machine booted with it in once, then failed to boot with it again. I have a 70PC1 on the way that I'll try next.
• Resetting NVRAM: https://forum.vcfed.org/index.php?threads%2Fhow-to-workaround-when-your-sun-ultra-5-10-nvram-no-longer-works.52997%2F

# 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

• New NVRAM chip with battery: https://groups.google.com/g/comp.unix.solaris/c/XY0yoiyFaTc
  • You can find them on eBay: https://www.ebay.com/sch/i.html?_nkw=M48T59Y-70PC1
• https://forum.vcfed.org/index.php?threads%2Fsun-blade-100-nvram-reprogramming.1237441%2F
• https://github.com/MrSparc/idprom-repair