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- Newsgroups: comp.sys.ibm.pc.hardware
- Path: sparky!uunet!mcrware!adam
- From: adam@microware.com (Adam Goldberg)
- Subject: Re: ISA cards in an EISA bus
- Message-ID: <1992Sep3.190409.17253@microware.com>
- Sender: news@microware.com
- Nntp-Posting-Host: ren
- Organization: Microware Systems Corp., Des Moines, Iowa
- References: <1992Aug31.201502.14568@ccu.umanitoba.ca>
- Date: Thu, 3 Sep 1992 19:04:09 GMT
- Lines: 26
-
- 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.
-