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- From: rseymour@reed.edu (Robert Seymour)
- Newsgroups: comp.sys.mac.hardware
- Subject: Re: Quadra 700 - Multitasking
- Message-ID: <1992Nov5.075848.15489@reed.edu>
- Date: 5 Nov 92 07:58:48 GMT
- References: <sharad.720933792@murlibobo>
- Sender: news@reed.edu (USENET News System)
- Reply-To: rseymour@reed.edu
- Organization: Reed College, Portland, OR
- Lines: 37
-
- In article <sharad.720933792@murlibobo> sharad@mullian.ee.mu.OZ.AU (Sharad)
- writes:
- > I want to buy a Macintosh to run A/UX. I understand that the Quadra 700
- > is multitasking and should be able to handle unix. My question is :
- > Does the Qudra 700 have DMA. To the best of my knowledge it does not(I
- > hope I am wrong). If there is no DMA then I imagine that the multitasking
- > performance will be stuffed. Can someone please make a comment on this
- > issue.
- > --
- > sharad
-
- The Quadra 700 can indeed multi-task, and runs A/UX about as well as
- any of the other machines. It does not have direct memory access by the
- peripherals, so yes the performance is hampered. It's not terribly important to
- use a DMA controller unless your doing a very large amount of I/O. The
- effectiveness of using a DMA depends heavily on the manner in which it is
- implemented. For instance, the NeXT Turbo architecture which uses a ASIC
- (Application Specific Intergrated Curcuit) and DMA in sync with each other is
- wonderful, while many systems with DMAs don't use the potential provided by
- distributing this task. However, I highly suggest you use A/UX 3.0, because I
- think its an awful implementation of UNIX. Right now, the Macintosh as a UNIX
- workstation is not a very good computer. I hope that this will change with
- PowerPC. It is supposed to have a multi-threading SMP (Symmetric
- MultiProcessing) microkernel architecture, with UNIX in mind at the beginning
- (though not the primary OS).
-
- P.S. A/UX is also quite expensive (compared to it coming free and integrated
- on almost all other workstation type computers. Check out the Sun
- Tsunami which will be announced on November 10th. It will be RISC using
- Solaris 2.0 and retail for under $6000. Though, I don't like the OS,
- for UNIX it's a great deal from what I've heard.
-
- --
- Robert Seymour rseymour@reed.edu
- Departments of Physics and Philosophy
- Artificial Life Project Reed College
- Reed Solar Energy Project (SolTrain) Portland, OR
-