solaris7 x86 (FYI, my post is not much help)
It is now a long time ago, but Solaris7 x86 "11/99" can install on a Pentium
166MHZ with 128MB ram, a 4GB disk, a 2MB ATI videocard and a 3Com NIC. You
will have Openwindows as the GUI with no substantial software.
The installation took forever. You will have no apps or C/C++ compiler.
GCC was available online. I think the included Netscape (or was it
HotJava) browser was a version 2 browser, but it did its job.
Your best bet is to browse the hardware compatibilty lists (HCL) for the
last few Solaris releases somewhere on Sun's website.
I apologize that I can't offer more detailed information. Good luck.