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- UNIDRIVE-128 is (c) Copyright 1986 by Frank Prindle. This program may be
- freely distributed in both source and object form, but may not be sold for
- profit.
-
- UNIDRIVE-128 is a utility for the Commodore 128 running CP/M Plus, with one
- or more Commodore 1571 disk drives. UNIDRIVE-128 enhances the C-128 CP/M
- implementation by allowing the 1571 disk drive(s) to read or write CP/M 5.25"
- MFM disk formats other than the seven MFM formats supported by the standard
- Commodore supplied BIOS.
-
- UNIDRIVE-128 is menu driven and simple to use; select the MFM format(s) to
- be supported (up to 10) by pressing the menu letter, then press RETURN to
- enable use of those formats. The standard 7 formats are pre-selected, but
- may be de-selected by pressing their menu letter if more than 3 additional
- formats are required (not real likely). To abort without changing the
- current formats supported, press the ESCape key.
-
- Once a set of formats have been selected and enabled, and UNIDRIVE-128 has
- terminated, an MFM CP/M diskette in any of the selected formats may be
- inserted into any 1571 drive on the system (including virtual drive E:) and
- logged in. If the diskette being logged could possibly be one of several
- different formats selected, the Commodore BIOS will display a potential disk
- format at the bottom of the screen; use the right arrow key to change this
- display (if necessary) until the format displayed corresponds to the format
- of the disk in the drive, then press RETURN. If the diskette being logged
- could only match one selected format, no menu selection will be required. If
- the diskette being logged does not match any selected format, "missing" will
- be displayed and pressing RETURN will report a disk error. When multiple
- formats have been selected, each drive in the system may be logged in with a
- different MFM format; the three Commodore GCR formats are unaffected and always
- available.
-
- Because the Commodore 128 BIOS already includes support for multiple MFM
- diskette formats, UNIDRIVE-128 is a very simple program. No part of the
- program or any RSXs remain once it has terminated - all format translation
- is handled by the BIOS in bank 0; none of the 58K TPA is lost for application
- programs.
-
- UNIDRIVE-128 Version 1.0 supports only 24 CP/M disk formats (chosen pretty
- much at random) on one menu screen, and does not support diskette formatting.
- Future versions will support many more formats, and will support formatting.
- Only "double density" MFM formats are currently supported since it is not
- known if the 1571 can read or write in single density (nor do I have a source
- of single density diskettes with which to test); perhaps this will be ironed
- out in future versions.
-
- FCP (10 Nov 86)