From mboxrd@z Thu Jan 1 00:00:00 1970 From: charles.unix.pro@gmail.com (Charles Anthony) Date: Wed, 2 May 2018 19:54:40 -0700 Subject: [TUHS] /dev/drum In-Reply-To: <20180430150532.4B67218C09C@mercury.lcs.mit.edu> References: <20180430150532.4B67218C09C@mercury.lcs.mit.edu> Message-ID: On Mon, Apr 30, 2018 at 8:05 AM, Noel Chiappa wrote: > > 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. > > 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 -------------- next part -------------- An HTML attachment was scrubbed... URL: