Path: utzoo!mnetor!uunet!husc6!bloom-beacon!mit-eddie!ll-xn!ames!pasteur!ucbvax!XX.LCS.MIT.EDU!ROMKEY
From: ROMKEY@XX.LCS.MIT.EDU (John Romkey)
Newsgroups: comp.protocols.tcp-ip.ibmpc
Subject: Re: Western Digital board
Message-ID: <12397216916.47.ROMKEY@XX.LCS.MIT.EDU>
Date: 10 May 88 15:06:26 GMT
References: <21523@amdcad.AMD.COM>
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 13

Western Digital's claims, re: speed on an AT and ease of configuration,
are basically correct.

The AT's DMA controller runs slower than the PC's, because (I think) it
loses some cycles since you've got a second controller cascaded with it.
The 286 string instructions are a lot faster. Plus, since it's memory mapped,
they're not JUST 286 string instructions; the whole 80x86 line has them.

On the other hand, it's also difficult to deal with mapping in memory when
you've got who knows what random EMS memory and EGA's and BIOS extensions and
whatever floating around in your physical address space.
					- john
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