der Mouse writes:
> I've got a SPARCstation 1+ at home.  Currently it's got 16 megs of RAM,
> in the form of 16 one-meg SIMMs.
> 
> Under what circumstances can such a machine take 4-meg SIMMs?  I seem
> to recall seeing it said that it could be done, but don't recall ever
> seeing the restrictions delineated.  I've seen a "SPARCstation 1+
> Installation Guide" (Sun PN 800-4784-10, rev A of 2 April 1990) that
> describes how to install 1M SIMMs, including which slots they can go
> into.  But of 4M SIMMs it says only
> 
> 	In addition to the standard 1 megabyte SIMMs, 4 megabyte SIMMs
> 	are also available.  You can upgrade your SPARCstation 1+ with
> 	4 megabyte SIMMs or combine 1 megabyte SIMMs with 4 megabyte
> 	SIMMs.  If you order 4 megabyte SIMMs from Sun Microsystems,
> 	Inc., follow the installation instructions that come packaged
> 	with your 4 megabyte SIMMs.
> 
> This seems to confirm that it's possible, but is singularly
> uninformative about details.  Anyone know, or have a pointer to a
> document that talks about it?

Have a look at:

  http://doener.unix-ag.uni-kl.de/FAQ/sun.hardware.FAQ

I believe it's got some info on how (i.e. in what order) to fill the banks... 

Later...

Greg Oster

oster@cs.usask.ca
Department of Computer Science
University of Saskatchewan, Saskatoon, Saskatchewan, CANADA