19 May
2015
19 May
'15
11:12 p.m.
Thanks, very useful info, and the manual is indeed what I was missing. But
now where to find the DMS, with two cards in particular, that's not going
easy to find both that match...
> ...the recently posted IO manual says it can
support ... up to
> 1.28M.
From: "J. David Bryan" <jdbryan at
acm.org>
That's correct, although the machine must be equipped with the Dynamic
Mapping System (DMS) in order to access more than 32KW. For the 2112, DMS
is product number 12976A. It consists of a card (the HP 12731A Memory
Expansion Module) that plugs into slot 112 in the front card cage) and
another card that contains microcode that implements the DMS instructions;
the latter mounts to the main CPU board at the bottom of the chassis...
The "Standard Performance Memory
Systems Installation and Service Manual" (5955-4310 April 1979) details the
requirements; it's available from Bitsavers in the
"1000" subdirectory.
-- Dave