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- Path: sparky!uunet!crdgw1!rdsunx.crd.ge.com!ariel!davidsen
- From: davidsen@ariel.crd.GE.COM (william E Davidsen)
- Newsgroups: comp.arch
- Subject: Re: Request Info Re Bus Trends & Intel 486s
- Keywords: Intel 486 Bus
- Message-ID: <1992Jul27.163536.20755@crd.ge.com>
- Date: 27 Jul 92 16:35:36 GMT
- References: <rjmartin.711191773@extro.ucc.su.OZ.AU> <1992Jul20.003506.23290@theus.rain.com> <id.TJRR.XR8@ferranti.com>
- Sender: usenet@crd.ge.com (Required for NNTP)
- Reply-To: davidsen@crd.ge.com (bill davidsen)
- Organization: GE Corporate R&D Center, Schenectady NY
- Lines: 28
- Nntp-Posting-Host: ariel.crd.ge.com
-
- In article <id.TJRR.XR8@ferranti.com>, peter@ferranti.com (peter da silva) writes:
-
- | Why is it that backplanes aren't more common on the desktop? Even for the PC
- | world, they're available (under the ugly name "passive motherboard"), and until
- | the IBM-PC came out they were the norm for multi-board systems (you had either
- | single-board CPUs or S100 or equivalent). The only exception was the Apple II,
- | and then the IBM-PC. Is it just tradition or is there something that makes a
- | motherboard system inherently better?
-
- If you are not upgrading the system often, a motherboard is a lot
- cheaper and more reliable. With reliability related to number of
- connections, having the CPU plug in on a board adds room for problems,
- take space, adds cost, etc. Also, a backplane normally has boards at
- right angles to the plane, and that makes the total package larger than
- the tiny "pizza box" configurations.
-
- A backplane would be fine if we could only agree on how large it
- should be ;-) I can't see less than 64 bits data, 48 bits address, and a
- 32+32 bit set of lines for video adaptor(s). Add control lines and get a
- large connector.
-
- Price performance brought motherboards into favor, and will probably
- keep them there in the desktop market.
- --
- bill davidsen, GE Corp. R&D Center; Box 8; Schenectady NY 12345
- It never ceases to amaze me that otherwise rational people, able to
- understand calculus, compound interest, and the income tax form, can
- continue to believe that poker is a game of chance.
-