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- This is the Commodore 128 CP/M adaptation of RDMS (version 2.33 of 7 May 86).
- It allows reading of any of the 4 MSDOS format diskettes on the C128. MSDOS
- format is that produced by the IBM-PC and it's clones, when running the
- PC-DOS or MS-DOS operating system.
-
- Porting to the C128/Aztec C involved:
-
- - minor bug fixes in "insufficient memory" checking and handling
- of command line parameter(s).
-
- - catering to the whims of Aztec C (e.g. no unsigned long int).
-
- - modifying "readSec3" to use 0 origin physical sector numbers
- instead of 1 origin.
-
- - extending the C128 bios MFM format table by 4 entries so that
- the bios could recognize MSDOS diskettes and perform the correct
- track/sector translations on a C-1571 drive.
-
- - fixing one very serious bug which caused the MSDOS disk to be
- *written* to when attempting to extract a file from a subdirectory.
-
- When using this program on the C128, after the MSDOS drive is specified, the
- C128 bios will display a diskette format selection at the bottom of the screen.
- The user must use the right/left arrow keys to make this format match the type
- of MSDOS diskette in the drive; valid choices are MSDOS-1 DS or MSDOS-1 SS (the
- 8 sector/track formats from older MSDOS versions), and MSDOS-2 DS or MSDOS-2 SS
- (the newer 9 sector/track formats). When the correct format is displayed, the
- return key should be pressed to continue with the program. If the incorrect
- format is selected, the program will still indicate the correct format, but
- part of the directory, and all files, will be read incorrectly. Note that the
- default double side strategy is "cylinder" mode, so none of the flags mentioned
- in the documentation need ever be used - just use RDMS or RDMS <drive>.
-
- Frank Prindle
- 31 October 1986