VDISK went through an extensive reorganization and debugging process during the past three weeks. Now 80% of all known TRS-80 Model I/III/4 operating systems are correctly addressed by the program. Important bugs have been fixed, making crashes and other strange behaviors very unlikely to happen.

Here is a summary of changes for version 0.4:

• Addition of support to TRSDOS 1.1, NEWDOS/80 1.0, LS-DOS 6.3.1 and MICRODOS 1.12 (experimental)
• Inclusion of four quietness levels to better control the program verbosity ("/Q" parameter)
• Reordering of the OS detection routines in automatic mode to improve their overall accuracy
• Renaming of the OS command-line names to facilitate their memorization
• Improvement of the NEWDOS/80 identification algorithm
• Inclusion of a check against empty files in the GET routine of the command-line interface
• Correction of a bug in the DUMP routine of the command-line interface which prevented it to show the last sector of disks whose sector numbering starts in 1 instead of 0
• Correction of a bug in the NEWDOS/80 module which caused the file seeking functions to return an error when reading the 32nd entry of the HIT, due to an unusual usage of that entry by the OS
• Correction of a bug in the DMK module that led it to report incorrect disk densities for some disks
• Correction of a bug in the DMK module that caused some incorrect sector readings (thanks to David Sutherland for pointing this out)
• Correction of a bug in the DMK module which resulted in reading errors when only one side of a double-sided disk is formatted

The focus for the next release will be the graphical user interface. In the meanwhile, please report any bugs you may find using the contact form available from the top menu.

This program can be freely downloaded from the downloads page.