Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!bloom-beacon!husc6!uwvax!vanvleck!uwmcsd1!ig!agate!ucbvax!CORY.BERKELEY.EDU!dillon From: dillon@CORY.BERKELEY.EDU (Matt Dillon) Newsgroups: comp.sys.amiga Subject: Re: Amiga UNIX Message-ID: <8806212030.AA00481@cory.Berkeley.EDU> Date: 21 Jun 88 20:30:25 GMT Sender: daemon@ucbvax.BERKELEY.EDU Lines: 21 :time consuming. One of the principal foundations of UNIX is cheap processes, :and this is not possible with a plain 68000. One of the work arounds for this :problem is the "forkexec" command. I believe the Amiga has this. But this :is not a true fork command and thus not compatable with UNIX. Er, since when is the principal foundation of UNIX a cheap process? Whatever they are, they aint cheap! : Intel got lucky with their convoluded segment registers in the 80x86 :family. Since there is a Data base register, they can make a copy of the :data segment and therefore have a true fork. For a 68k system, one must :have an MMU or a 68020 (68030) which has a built in MMU. : : -Erik Johannes Usually, when you get to that point, you want an MMU anyway. But, in essence, I would agree that a limited UNIX could be run on the 80x86 without an MMU. -Matt