386i - i486 upgrade

[Glenn Pitcher]

Some time ago (when the SS1 first came out) Sun announced an upgrade for
the 386i's to turn them into 486's.  Because of the popularity of the SS1,
these upgrades were apparently never shipped.  End of story.

Or so I thought...

I the December 1990 issue of the Software Technical Bulletin, there is a
small one page article breifly talking about this upgrade (UG-RR-350).
Before I had read this (last month) I had talked to several Sun personel
and they all knew the upgrade exsisted at one point but couldn't find any
recent info concerning it.

Does anyone out there know anything about this upgrade?? I currently have
a 386i/150 at home and would like to somehow get it upgraded.  

While I'm on the subject of upgrading, I've also toyed with the idea of
upgrading my system via a faster crystal (20Mhz to 25Mhz) I know this can
be done but I may run into some problems with heat disipation (among other
things).  I would really like to plug a 33Mhz into it but I've hear that
some of the motherboard circuitry may not be able to handle it (i.e
caching circuits).

Would anyone care to comment on this??

Thanks for any info in advance,