Xref: utzoo comp.unix.microport:1578 comp.sys.intel:532 Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!mailrus!ames!sgi!daisy!david From: david@daisy.UUCP (David Schachter) Newsgroups: comp.unix.microport,comp.sys.intel Subject: Re: no significant bugs in 80286 virtual memory Message-ID: <1641@daisy.UUCP> Date: 19 Sep 88 21:38:39 GMT References: <326@siswat.UUCP> <8162@bigtex.uucp> Reply-To: david@daisy.UUCP (David Schachter) Organization: Daisy Systems Corp., Mountain View, Ca. Lines: 17 Daisy's "DNIX" operating system is a virtual memory operating system for the '286. It has been around since mid 1985 and works fine. The only chip problem was a problem with the flags byte being trashed when attempts are made to write to read-only segments. This prevented us from emulating dirty bits by marking data read-only until the first attempted write. DNIX is a segment-swapping virtual memory operating system, with support built into the (real-time) kernel for window management and networking. Not bad, for a '286. (It also runs on the 8086, but without virtual memory, and much slower.) By the way, I'm writing this from an 80386 system running DNIX XV5.0.10, rlogin to a VAX 750 running 4.2 bsd Unix. -- David Schachter