6 Oct
2008
6 Oct
'08
7:59 a.m.
Paul_Koning at Dell.com wrote:
A very nice reference is "Computer Structures --
readings and examples" by Bell and Newell (McGraw-Hill, 1971). There's a section
in it about "Virtual-address space and memory mapping" (page 77-80). It
describes a whole lot of schemes and lists early instances. For example, there is a
scheme that has protection but not relocation (IBM 1800 -- per word, and SDS Sigma-2 --
per page). There are schemes with a base address and length (PDP-6, CDC 6000) or two of
those (PDP-10). And there are page mapping schemes (Atlas, CDC 3500) and segment
descriptor table ones (Burroughs 5500). All those are early to mid 1960s.
paul
Search for some material on the Scientific Data Systems (SDS) 32 bit
Sigma line (the 6,7 and 9) and UTS. These had multiple register sets
and page protection / mapping. You might also search for the Xerox TTL
follow on versions, the XDS 500 series boxes.
--
Joe Chisolm
Computer Translations, Inc.
Marble Falls, Tx.
830-265-8018