11 Feb
2003
11 Feb
'03
6:42 a.m.
--- Sean 'Captain Napalm' Conner <spc(a)conman.org> wrote:
It was thus said that the Great Hans Franke once
stated:
And typically does (VAX-11/750 - 14MB physical max, 4GB virtual space),
but not always (PDP-11 - 4MB physical max, 64KB process space, described
in the literature as virtual space since the CPU has 16-bit address
registers)
(*1) Often the term real memory is used, but that's
not correct. Physical memory is the memory installed
in a machine, while real address space is the addressable
amount of RAM by a CPU without using virtual addressing.
Virtual address space can never excede real address space
(After all, it's the maximum address range generated by
the (logical) CPU), while physical memory can go beyond
real or virual address space.
Virtual address space *can* exceed physical address space---the 80386
(and therefore, on topic) is a good example. A segmented architecture...
I have one word to say about segmented architecture... "Ewwwww"
-ethan