Downloaded ISO of SPARC 10 DVD from Oracle site, burnt it and tried to install on SUN Ultra 10 (300 MGz / 256 MB RAM / 80 GB IDE HDD)
Followed the process as specified below:
1. Stop+A to stop the current boot process.(Already SPARC 8 is installed)
2. AT OK prompt typed boot cdrom
3. After some time (3-5 min) prompting error *"boot device: /pci@1f,0/pci@1,1/ide@3/cdrom@2,0:f File and args:*_ Panic - Kernel : kmem64 allocation failure+_ Program Terminated+_ ok "+_
Checked in few blogs and burnt another DVD with less writing speed, still same error.
Checked with Sparc 8 CD's, Sparc 5.8 installing without any errors.
I suggest you forget about trying Solaris 10 on a system with such limited resources.
If I recall correctly, Solaris 10 needs a minimum of 768MB of RAM to install and 1GB or more of RAM to run, even if you had a cpu that was fast enough to run anything.
Perhaps consider it this way:
Would you even dream of trying to install MS Windows 7 on a Pentium-I at 300MHz?
Stay with your Solaris 8. It's from the same late 1990's era as that hardware and fits it just right.
The specific installation requirements are on the link that is found directly from the download page:
Oracle Solaris 10 8/11 System Requirements
6GB minimum for typical installation