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Article #5406Query on CP/M disk formats
From: prindle
Date: Wed, 29 Oct 1986 19:35
Date: Wed, 29 Oct 1986 19:35
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The Digital Research documentation on CP/M would seem to indicate that these are the variables (the BDOS cares about) among different 5.25" MFM diskette formats: . physical sector size . number of physical sectors per track . number of tracks on diskette . allocation unit size . number of directory entries . number of reserved system tracks . number of checksummed directory entries Furthermore, the BIOS will undoubtedly need these facts: . origin of physical sector numbering on each track (0 or 1) . track numbering philosophy of physical sectors on a double sided disk: - both sides considered one track - even tracks on side 0, odd tracks on side 1 - first half of tracks on side 0, second half on side 1 - something even more bizarre Are there any other parameters which are necessary to describe diskette formats? For example, are there variations within the format of a physical sector itself (number of syncs between header and data, checksumming technique, etc)? Thanks in advance, Frank Prindle Prindle@NADC.arpa
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!mnetor!seismo!columbia!rutgers!brl-adm!brl-smoke!smoke!prindle@nadc.ARPA From: prindle@nadc.ARPA Newsgroups: net.micro.cpm Subject: Query on CP/M disk formats Message-ID: <5011@brl-smoke.ARPA> Date: Wed, 29-Oct-86 14:35:13 EST Article-I.D.: brl-smok.5011 Posted: Wed Oct 29 14:35:13 1986 Date-Received: Wed, 29-Oct-86 22:42:09 EST Sender: news@brl-smoke.ARPA Lines: 27