Xref: utzoo comp.sys.mac:39137 comp.sys.mac.programmer:9338 Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!purdue!bu-cs!bzs From: bzs@bu-cs.BU.EDU (Barry Shein) Newsgroups: comp.sys.mac,comp.sys.mac.programmer Subject: Re: Todd Rundgren's Macintosh OS Message-ID: <39078@bu-cs.BU.EDU> Date: 28 Sep 89 13:54:48 GMT References: <16409@brunix.UUCP> <4399@internal.Apple.COM><32895@srcsip.UUCP> <1989Sep27.220839.13648@ux1.cso.uiuc.edu> Organization: Boston U. Comp. Sci. Lines: 29 >The mach kernel is a pretty basic operating system, providing only >minimal services. You *always* put something "on top of" mach; >in this way, it's somewhat like IBM's VM. That's not true. It might be a goal of the mach project but for now the releases have been a 4.3bsd kernel with a bunch of changes mostly adding new IPC facilities, virtual memory features, thread support and several other things. It's a lot of interesting stuff but the above doesn't describe it. >NeXT has put 4.3bsd UNIX "on top of" mach; sometimes, this combination >is referred to as "mach", but that's not *really* correct. NeXT has done no such thing to my knowledge. CMU's Mach project developed what you see on the NeXT, and most of it before NeXT even existed. Let's give credit where credit is due. (Just a note: I was involved with Mach development at Encore Computer, they've been delivering mach on their parallel systems for about two years now.) -- -Barry Shein Software Tool & Die, Purveyors to the Trade 1330 Beacon Street, Brookline, MA 02146, (617) 739-0202 Internet: bzs@skuld.std.com UUCP: encore!xylogics!skuld!bzs or uunet!skuld!bzs