3 May
2018
3 May
'18
4:54 a.m.
On Mon, Apr 30, 2018 at 8:05 AM, Noel Chiappa <jnc(a)mercury.lcs.mit.edu>
wrote:
7 page sizes. AL39, page 40:
PTWAM.ADDR
The 18 high-order bits of the 24-bit absolute main memory address of
the page. The hardware ignores low-order bits of this page address
according to page size based on the following:
Page size in words ADDR bits ignored
64 none
128 17
256 16-17
512 15-17
1024 14-17
2048 13-17
4096 12-17
I am unsure of exactly which model supported this, but somewhere in the
evolution from 645 to DPS8-M.
-- Charles
From: Johnny
Billquist
But how do you then view modern architectures
which have different
sized
pages? Are they no longer pages then?
Actually, there is precedent for that. The original Multics hardware, the
GE-645, supported two page sizes. That was dropped in later machines (the
Honeywell 6000's) since it was decided that the extra complexity wasn't
worth
it.