Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.3 4.3bsd-beta 6/6/85; site wlbr.UUCP Path: utzoo!watmath!clyde!cbosgd!ihnp4!nsc!voder!wlbr!steve 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 {trwrb, scgvaxd, ihnp4, voder, vortex} !wlbr!steve or ...wlbr!wlbreng1!steve