My Original Question was:
> 
> 
> Hello,
> 
> Can someone tell me what version of Solaris 1.x I need
> to install on a SPARC 5. I think its 1.1.1 version B ?
> 
> Thanks in advance
> 
> Joe
> 
 I was overwhelmed with responses ! Thanks to all Who replied !
The Answer is (drum roll please) 1.1.1 version B. ;) there are 
some patches needed,  summary is below:
The SPARC 5 can use Solaris 1.1.1 B.  Also, there is a 
Supplemental patch for Solaris 1.1.1 B called 101508 kernel 
patch for microsparc 2 (SPARC 5).
Yup, you need Solaris 1.1.1B aka SunOS 4.1.3_U1 rev B.
Generally it works ok, although we've had two problems:
1.  If you define it as a server, it will only let you specify
    sun4m clients, not the sun4c we wanted. (in suninstall)
2.  If your network has problems with giant packets from 
    ff:ff:ff:ff:ff:ff, the ethernet board in the SS5 will
    cease listening to incoming packets.  The fix is an
    unnumbered patch from Sun that replaces if_le.o in the
    kernel.  The fault was originally found on LX and Classics
    under 4.1.3_U1.
Yep - Solaris 1.1.1 rev B, plus the "ms2" patch for the MicroSPARC II.
(If you want a Solaris 2.x os you need Solaris 2.3 Edition II (SunOS 5.3 Ed. II)
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