Sounds like bad memory
> The cure seems to be to remove the additional 16MB.
> I don't think I have a faulty simm, since both banks work OK, if
> alone.
Ok make that bad cache, or insufficient tag ram.
> be left for use by controllers (SVGA???), but I am unable to find the
> relevant information anny more.
Very few boards do that now, and it is configurable. Your BIOS would also
report 15Mb as total free memory if it was enabled.
Most likely its lack of cache tag ram