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Path: sserve!newshost.anu.edu.au!munnari.oz.au!constellation!news.uoknor.edu!ns1.nodak.edu!netnews.nwnet.net!news.uoregon.edu!gaia.ucs.orst.edu!news.cs.indiana.edu!usenet.ucs.indiana.edu!vixen.cso.uiuc.edu!howland.reston.ans.net!agate!headwall.Stanford.EDU!leland.Stanford.EDU!jonathan From: jonathan@leland.Stanford.EDU (Jonathan Stone) Newsgroups: comp.unix.bsd Subject: Re: How was BSD written? Date: 11 Feb 1994 00:52:53 GMT Organization: DSG, Stanford University, CA 94305, USA Lines: 19 Distribution: world Message-ID: <2jekt5$let@nntp2.Stanford.EDU> References: <CKxEpn.1Lq@candle.uucp> <1994Feb9.055849.9351@nuchat.sccsi.com> <2jctac$qkd@mail.fwi.uva.nl> NNTP-Posting-Host: kahului.stanford.edu Casper H.S. Dik (casper@fwi.uva.nl) writes: >steve@sccsi.com (Steve Nuchia) writes: >>I always wondered how sysVr4 was written. Did the AT+T programmers >>implement virtual memory and TCP/IP from published specifications, >>or did they have access to BSD code? >The virtual memory came from Sun. Whose VM system was derived from 4.2BSD, if I recall correctly. Didn't SunOS 3.x use a "machine-independent" VM system that *was* VAX virtual memory structures, and translate in software to the Sun-2/Sun-3 MMU? Yes, it's a nitpick, Sun's VM system changed for SunOS 4.x; I don't know how *much* because I've never studied the SunOS source. My point is simply that the ancestry is *there*...