(I had privately written I thought I had 4.1.3U1).
I did two better than 4.1.3U1, and found "Solaris 1.0.1" (aka SunOS
4.1.2 + OW2), but it's SPARC only. It looks like 4.1.1U1 was the last
for Sun3 (and Sun2 was supported in 4.0.3, tho I'm sure it was AWFUL
slow!!)!
Looks like the ingredients (including 4.1.1U1) are available at:
http://www.sun3arc.org/BootTapes/index.phtml
Net boot docs at:
http://sites.inka.de/pcde/site/documentation_files/sunos_network_boot.html
And information about CD vs tape layout (Appendix A):
http://www.sun3zoo.de/en/install.html (But I imagine making a bootable
CD would produce many coasters first).
I'd probably do a diskless boot, format (partition) and dd the
miniroot in, and do a disk install from there (or just keep it diskless).
Good luck!
Phil
BTW I have a complete SunOS 4.0 doc set (in boxes), with 4.0.3 update,
and a 4.1.2 install manual free to anyone who pays shippping, and will
scan them, and make them available for free!
I also have a mess of SPARC equipment I saved from the dumpster: two
SS10, an SS4 and an SS5 (one with bad power supply) and a bunch of
"lunchbox" systems (IPC, IPX, Classic, LX), a Sun QIC drive, and a
mess of SCSI cables.