[Info-vax] Another Alphaserver 1200 memory question

[H Vlems]

On 29 jan, 04:14, moro... at world.std.spaamtrap.com (Michael Moroney)
wrote:
> H Vlems <hvl... at freenet.de> writes:
> >According to the Systems&Options guide the AlphaServer 1200 had three
> >memory options: MS300-BA (64 MB), MS300-DA (256 MB) and the MS300-EA
> >(512 MB).
> >Now the -CA code is missing and I wondered whether two 64 MB boards
> >would make a "mythical" MS300-CA.
> >When added, SRM reported the two boards as a 32 MB memory option and
> >that is what VMS also reported.
> >I had expected to see the experiment fail, unable to complete T24, or
> >unable to boot, or, since part of the console lives in upper memory, a
> >spectacular crash when VMS boots.
> >Who can supply an explanation for displaying only 25% of the installed
> >memory pair?
>
> Is what you have a "real" MS300-CA or just two 64 MB boards?  (does the
> -CA exist?)
>
> The console code has to know of supported/possible memory combinations
> so it can map them in place and locate the in-memory portion of the
> console code.  It may not know of the 128MB combo because DEC never
> planned to sell the -CA for it, and perhaps it just mapped it as a
> default which happened to be 32MB.  (perhaps a -AA was planned, for NT
> or something)

PS
I ordered two 512 MB boards for that system to see how they will
behave.