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- Path: sparky!uunet!think.com!ames!sgi!fido!fido!tomw
- From: tomw@orac.asd.sgi.com (Tom Weinstein)
- Newsgroups: comp.sys.ibm.pc.hardware
- Subject: Re: EISA vs. ISA -VESA Local Bus MotherboardsDIR
- Followup-To: comp.sys.ibm.pc.hardware
- Date: 15 Dec 92 21:38:07
- Organization: Silicon Graphics Inc.
- Lines: 40
- Message-ID: <TOMW.92Dec15213807@orac.asd.sgi.com>
- References: <1992Dec10.232429.13724@rti.rti.org> <TOMW.92Dec10205510@orac.asd.sgi.com>
- <1992Dec11.181215.315@csghsg5a.bitnet>
- Reply-To: tomw@asd.sgi.com
- NNTP-Posting-Host: orac.asd.sgi.com
- In-reply-to: lmebold@csghsg5a.bitnet's message of 11 Dec 92 18:12:15 GMT
-
- In article <1992Dec11.181215.315@csghsg5a.bitnet>, lmebold@csghsg5a.bitnet writes:
- > In article <TOMW.92Dec10205510@orac.asd.sgi.com>, tomw@orac.asd.sgi.com (Tom Weinstein) writes:
-
- >> EISA runs at 8.33 MHz. Comparing this directly to ISA's 8 MHz (even
- >> taking into account the 32-bit/16-bit difference) can be misleading,
- >> however. EISA's maximum transfer rate is 33 MB/s. ISA's maximum is
- >> 8 MB/s, but in most systems, and for most cards, it can only get
- >> 5.33 MB/s.
-
- > When you say you can only get 5.33 MB/s with EISA, look what you get with
- > ISA in real life! EISA just IS faster than ISA.
-
- That's not what I said. I said EISA runs at 33 MB/s peak, while ISA
- runs at 8 MB/s peak, and 5.33 MB/s average.
-
- > I'd be careful when buying a local bus pc. Although der is a VESA standard
- > that still doesn't mean that all these pc's will be compatible. If you want
- > to go with local bus I would suggest you make up your mind on what you want
- > to get and buy that - it's not guaranteed that you can upgrade later on.
-
- True. You can never be sure. On the other hand, if you find out your
- board is incompatible, you can always use the $500 you saved over buying
- an EISA system and replace it.
-
- > Apart from that EISA has more advantages like IRQ-sharing, DMA-functions
- > (with ISA bus you cannot address more than 16MB RAM directly - EISA can),
- > easier setup of new cards (you don't need to set any jumbers - at least it
- > should be like that; there are still some cards which need to be jumpered).
- > Furthermore EISA is a standard and you can use every EISA-card in every
- > EISA-system (just like ISA-cards in ISA-systems) whereas with local bus
- > that's not possible.
-
- > My suggestion: If you can afford it, get an EISA.
-
- My suggestion: If you are using software that needs the advantages EISA
- provides, get an EISA. Otherwise, get a VL-bus, and save the $500.
-
- --
- Love is a conveyor belt of | Tom Weinstein tomw@orac.esd.sgi.com
- warmth -- Jackie Chan | tomw@bears.ucsb.edu
-