Path: utzoo!attcan!uunet!husc6!rutgers!ucsd!ucbvax!WATSON.BBN.COM!dan
From: dan@WATSON.BBN.COM (Dan Franklin)
Newsgroups: comp.society.futures
Subject: Re: Memories...
Message-ID: <8812211821.AA08476@multimax.encore.com>
Date: 21 Dec 88 18:01:06 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 12

> ... Anyone know what the address space is for the RISC processors
> which are becoming so popular?

I don't know if the RISC chip set inside the RT PC would qualify as
"popular", but as I recall, its physical address space is 43 bits.
(The top 4 bits of each 32-bit virtual address choose one of 16 segment
registers; segment registers are 15 bits wide.  Thus the segment
address + 28-bit offset gives 43 bits.)  I think the current line
may only bring out 12 of those 15 bits, so the current implementations
may be restricted to 40 bits.

	Dan Franklin