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From: steve@wlbr.UUCP (Steve Childress)
Newsgroups: net.micro.6809
Subject: Defeat your CRC checking and speed 'em up
Message-ID: <384@wlbr.UUCP>
Date: Mon, 28-Oct-85 20:06:17 EST
Article-I.D.: wlbr.384
Posted: Mon Oct 28 20:06:17 1985
Date-Received: Wed, 30-Oct-85 05:29:45 EST
Organization: Eaton IMS, Westlake Village, CA
Lines: 21


May I suggest that RS-DOS on the CoCo can ignore disk read errors (soft?)
and therefore proceed to incorrectly load a program. I don't find this
too hard to accept, given that CoCo DOS is not a DOS but really a
cassette tape emulator. And one cannot backspace an audio cassette and re-read.

The CRC check in OS9 can be defeated to the advantage of speed. The risk
is that data will be corrupted as it is stored in memory, having been
read OK from disk. Very few minicomputers (much less micro's) have bus
error checking for I/O because the error rates are tiny as compared to
soft and hard errors on magnetic media.


		Regards,
			Steve Childress
			Eaton IMS    R&D Group MS 43 
			31717 La Tienda Drive
			Westlake Village,  CA    91360
			(818) 889-2211 X2148
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