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- From: mkg4@cunixb.cc.columbia.edu (Michael K Gavin)
- Newsgroups: comp.sys.ibm.pc.hardware
- Subject: Re: ISA cards in an EISA bus
- Message-ID: <1992Sep4.231928.7930@news.columbia.edu>
- Date: 4 Sep 92 23:19:28 GMT
- References: <1992Aug31.201502.14568@ccu.umanitoba.ca> <1992Sep3.190409.17253@microware.com>
- Sender: usenet@news.columbia.edu (The Network News)
- Reply-To: mkg4@cunixb.cc.columbia.edu (Michael K Gavin)
- Organization: Columbia University
- Lines: 39
- Nntp-Posting-Host: cunixb.cc.columbia.edu
-
- In article <1992Sep3.190409.17253@microware.com> adam@microware.com (Adam Goldberg) writes:
- >dab@ubitrex.mb.ca (Daniel Boulet) writes:
- >
- >>I'm about to purchase an EISA bus system. I've heard that there are some
- >>problems that one can encounter if ISA cards are used in an EISA system.
- >
- >>What sort of problems could I run into? I'm definitely intending to purchase
- >>an EISA disk controller. I was planning on getting ISA cards for the rest
- >>(video, serial ports, floppies).
- >
- >Here's the rub: (Someone correct me if I'm wrong...)
- >
- >An EISA bus runs at 16MHz, but an ISA bus runs (usually) at 8 or 10 MHz.
- >When you plug an ISA card into an EISA bus, the EISA bus sees the ISA
- >card and lowers it's speed to 8MHz. Thereby decreasing throughput
- >because of the lower clock speed.
- >
- >The solution is to buy a EISA machine that has floppy & parallel &
- >serial ports on the MB (or on an EISA card).
- >
- >Can someone in the know confirm/deny this?
- >
- >--
- >Adam G.
- >adamg@microware.com, or ...!uunet!mcrware!adamg
- >The above is not to be construed in any way as the official or unofficial
- >statements of Microware, or any Microware employees.
-
-
- Does this mean that if I have an ISA modem in my computer (and it would be kind
- of pointless to get an EISA modem, if they even exist) that my EISA SCSI
- controller starts working at half speed?!?!?!?!? If so, then I feel pretty
- stupid having gone ahead and paid for EISA....
-
- More information would be appreciated....
-
- Mike Gavin
- mkg4@cunixb.cc.columbia.edu
- uunet!columbia.edu!mkg4
-