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Path: sserve!newshost.anu.edu.au!munnari.oz.au!news.Hawaii.Edu!ames!agate!ihnp4.ucsd.edu!network.ucsd.edu!keyhole.ucsd.edu!not-for-mail From: eld@keyhole.ucsd.edu (Eric Dorman) Newsgroups: comp.os.386bsd.questions Subject: Re: 386 vs 286 Date: 12 Apr 1994 00:29:42 -0700 Organization: MPL of SIO at UCSD Lines: 16 Sender: eld@mpl.ucsd.edu Message-ID: <2odil6$i0s@keyhole.ucsd.edu> References: <1994Apr11.143423.7527@roadie.uucp> NNTP-Posting-Host: keyhole.ucsd.edu Keywords: 386 vs 286 The '286 doesn't have facilities for paging like 386/486's. It only has segments which are arranged like 80x86's (x<1). Thus paging policies aren't really relevant to it. It is possible to construct a demand-load-virtual-segmentation system for '286s but I don't recall if this was ever used on any released system (i don't know about Intels iRMX286, tho.) I got a lot of work done on '286s 'till the PD software got massive with only a little increase in functionality. If only Intel had put the damn priviledge bits in the *top* of the segment register vice the bottom... Eric Dorman eld@mpl.ucsd.edu eric@siodept.ucsd.edu