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- From: tomw@orac.esd.sgi.com (Tom Weinstein)
- Newsgroups: comp.sys.ibm.pc.misc
- Subject: Re: What is local bus?
- Message-ID: <TOMW.92Sep2182900@orac.esd.sgi.com>
- Date: 2 Sep 92 22:29:00 GMT
- References: <1812u0INN51t@usenet.INS.CWRU.Edu> <1992Sep2.163017.25644@cci632.cci.com>
- Sender: news@zola.esd.sgi.com (Net News)
- Reply-To: tomw@esd.sgi.com
- Organization: Silicon Graphics Inc.
- Lines: 54
- In-Reply-To: sjo@cci632.cci.com's message of 2 Sep 92 16:30:17 GMT
-
- In article <1992Sep2.163017.25644@cci632.cci.com>, sjo@cci632.cci.com (Steve Owens) writes:
-
- > I read in Computer Shopper recently that VESA has developed a
- > Local Bus standard that the industry is adopting. Since I'm going to
- > be in the market for a new motherboard within the next few months, I
- > was wondering:
-
- > 1) What's the difference between Local Bus and EISA?
-
- EISA is a real system bus. Local Bus just adds 1-3 special slots that
- run at processor speed. EISA will cost you $1000. Local Bus will cost
- you $50-$100. Local Bus is faster than EISA.
-
- Note that there are EISA Local Bus machines being sold. Seems pretty
- stupid to me. As far as I'm concerned, the main advantage of EISA is
- speed, so why not just get a regular ISA Local Bus machine?
-
- Local Bus gives you up to 3 32-bit slots that run at the processor
- speed. Generally, they use EISA-style connectors, but they aren't EISA
- compatible. If you want to use the 32-bit slots, you have to get
- special cards for it. Orchid now sells a Fahrenheit local bus board.
- ATI is going to be selling new versions of their Windows accelerator
- cards that work in a local bus.
-
- > 2) I know the industry has only been luke-warm about adopting
- > EISA, but how do you think Local Bus will contend?
-
- Very well. It's nearly free, and it gives you at least 6x as much
- bandwidth as regular ISA. As I said, Orchid and ATI are already making
- graphics boards, and there are several caching disk controller
- manufacturers who area makeing local bus cards.
-
- > 3) Should I wait and purchase a Local Bus motherboard when they
- > become more abundant?
-
- You should wait until the new VESA-compatible Local Bus motherboards
- start appearing.
-
- > 4) What about ISA? Is it basically a dying breed, or is there
- > enough life left in it for me to consider purchasing a
- > motherboard with an ISA bus?
-
- The nice thing about Local Bus is it still has a regular ISA bus on it.
- You can still use all your old cards.
-
- > The processors I'm considering at this point are either a
- > 486-25 or a 486-33, with a minimum of 8Mb RAM to start. I'm not
- > sure which manufacturer I'll look for, but I'm sure it will be a
- > name I know (such as Mylex, AMI, or Chips & Technologies.) The
- > only thing I'm not sure of is bus architecture.
-
- --
- Love is a conveyor belt of | Tom Weinstein tomw@orac.esd.sgi.com
- warmth -- Jackie Chan | tomw@bears.ucsb.edu
-