Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!samsung!zaphod.mps.ohio-state.edu!sdd.hp.com!ucsd!rutgers!rochester!kodak!atexnet!cvbnet!feds19!jshekhel From: jshekhel@feds19.prime.com (Jerry Shekhel ) Newsgroups: comp.sys.atari.st Subject: Re: "DOS machines" (Was: TT (Who has one?)) Keywords: long Message-ID: <713@cvbnetPrime.COM> Date: 31 Jul 90 16:11:22 GMT References: <1990Jul19.135115.2032@cunixf.cc.columbia.edu> <1990Jul19.160526.2215@arcsun.arc.ab.ca> <6764@vax1.acs.udel.EDU> <692@cvbnetPrime.COM> <3160@rwthinf.UUCP> <701@cvbnetPrime.COM> Sender: postnews@cvbnetPrime.COM Reply-To: jshekhel@feds19.UUCP (Jerry Shekhel ) Organization: Prime Computervision, Bedford MA Lines: 37 In article onders@picasso.ipl.rpi.edu (Timothy E. Onders) writes: > >Think about the claims you're making. Note the fact that you are comparing >the 80286, Intel's second generation of the 80x86 line, to the 68000, >Motorola's first generation of the 680x0 line. If you compare it to the >68010, you'll find full vm support, and a lot of nice features, such as >linear address space, normal data format, a stack that grows in the right >direction, &c. > Excuse me, but even the 68020 does not have full VM support. That's why it requires a 68551 MMU to run UNIX. Sun's 68020 machines, I believe, used a proprietary MMU. "Normal data format"? "Stack that grows in the RIGHT direction"? Who determines these things? Programmers don't have to worry about these things even at the machine language level! > >If you're going to compare Blueberries to Oranges, you're >not going to be accurate. And, anyway, the 68000 can, but the ST's MMU, >since you seem to be basing your experience on the ST, can't. With a >proper MMU, the 68000 had "protected(supervisor)" mode long before the >80x86 architecture. > I wasn't talking about supervisor mode. I was talking about hardware support for multitasking with an isolated memory space for each process. And besides, certainly, we can always throw more hardware at the problem. We could use a real MMU on the ST, just like we could put a 386 processor board into an 8086 machine. But I still haven't come closer to under- standing why people on this newsgroup hate the Intel processor, when the Intel/Motorola lines are so similar in terms of performance. > > Tim Onders > -- Jerry Shekhel