This page contains DSK and DMK image utilities. Examples of such utilities would be:
The standalone version of this tool has expanded way beyond this function, so it is discussed on the Multi-Utilities Page.
From a disk features standpoint, the command line tool provides disk-image analysis, directory listings, file extraction, damaged-file recovery, sector inspection, and emulator-based testing for supported TRS-80 floppy images.
Supported Disk Image Formats
.DSK is a generic extension that may contain JV1, JV3, or DMK data. The info command identifies the underlying format..IMG as a supported format or describe general-purpose IMG support. Do not assume that an arbitrary IMG file is compatible.Disk Identification and Cataloging
info to identify disk-image contents and recognized operating systems, including DOS versions where the disk provides that information.info --verbose to display additional disk information, such as floppy geometry.info --json to export detailed file information for automated cataloging, regression testing, or other processing.dir to list files inside supported disk images, showing filesystem-appropriate details such as dates, file types, attributes, protection levels, or paths.dir --system to include normally hidden system files.--cpm-records reports complete stored records instead.Supported Disk Operating Systems and Filesystems
File Extraction and Recovery
extract to write the files inside a supported floppy image to an existing directory, for example trs80-tool extract in.dmk out.--system to include system files that would otherwise be omitted.--mark-damaged to add [DAMAGED] to affected output filenames.--lowercase to write extracted files with lowercase names.(2) rather than overwriting extracted files whose names differ only in case.--cpm-records to retain complete 128-byte records instead.--ucsd-pascal-raw to retain their original on-disk representation.Sector Inspection and Damage Analysis
sectors to display a table with tracks as rows and sectors as columns.sectors --contents to display sector data alongside the sector map.sectors --bad to list missing sectors and sectors with CRC errors.--bad and --contents to inspect the contents of problematic sectors.--trace=floppy and --trace=base to expose diagnostic decisions when investigating an unrecognized or unusual image.Disk-File Conversion and Program Analysis
.CMD programs into cassette-format .3BN files. Programs requiring disk services may still need adaptation..ASC files and supports tokenizing text BASIC into .BAS files..CMD program files. This does not itself create a floppy image or insert the program into one..ROM and .BIN files to .CMD, with --start setting both load and execution addresses..CMD and supported .SYS files into assembly source or formatted listings, with optional entry points and code/data analysis controls.FLT, DVR, and OV? files to be treated like CMD files.SYS6.SYS and SYS7.SYS, disassembling their overlays separately, and handles VTOS yanked-load blocks..SYS files containing raw boot-sector dumps for use with info, hexdump, and disasm.hexdump to inspect extracted programs or supported boot-sector files, with optional expansion of repeated lines.Disk Emulation and AI-Controlled Testing
trs80-tool run tdos13a.dsk.run --mount to mount several floppy images in consecutive drives starting at drive 0.--write-protected to mount all floppy images read-only in the terminal emulator.mount_disk so an AI assistant can insert a disk image into a numbered drive without restarting the machine.reset tool retains mounted disks, allowing an assistant to reset the machine and boot from a newly mounted disk.
TRSTools is a Windows Explorer-like utility that makes it easier to work with virtual disk images.
For beginners and intermediate users, this is the only utility you will need on this entire page as it has all the functions of almost every program here. For advanced users, you might also want Diskmanip and DMK File Viewer/Editor v1.01.
Features Include:
Development of this utility stopped some time ago, but there were a number of disk formats I determiend were not working, so please beware when using this utility on any of the following:
TRSREAD and TRSWRITE are command line utilities which allow for the import and export of files to/from DSK and DMK images.
TRSREAD usage is TRSREAD [options] virtual disk [files] where the [options] are
A native, dependency-free reader and extractor for TRS-80 Model I NEWDOS/80 and G-DOS floppy disk images (.dmk, .dsk). Lists directories and extracts files byte-for-byte, with no emulator, no Windows, and no external tools required — just Python 3.
Built for the preservation of an original TRS-80 Model I disk collection, and validated against authoritative TRSTools extractions across multiple disk geometries.
This repository also includes an optional SwiftUI wrapper that gives the tool a native drag-and-drop macOS interface (see the end of this README).
It can be found at https://github.com/Egbert-Azure/trsextract
Intended to allow one to perform a series of operations (read, write, rename, delete etc.) on files stored in a TRS-80 virtual disk image.
Note: Requires "libgcc_s_dw2-1.dll" (not included)
Commands:
This is a small utility which allows you to access virtual TRS-80 DSK/DMK images at a file level, as if they were normal PC disks. A virtual TRS-80 disk is actually a PC file encoded with information extracted from a real TRS-80 floppy, in order to preserve its content and also to enable its use with TRS-80 emulators.
The TRS-80 Virtual Disk Manager shows the file name, size, date and attributes of each directory item, supports reading both .DSK and .DMK image files, and allows exporting TRS-80 files to the Windows file system.
Only read support is implemented.
VREAD and VWRITE were the first DSK import/export utilities, packaged by Jeff Vavasour with his Model I emulator. These utilities cannot process only single density DSK files.
This program reads DSK files, and displays the disk filenames in a list box. Clicking on a file, allows the file to be saved to a PC folder. It can be used just to view the Files on a DSK/DMK, if you dont want to copy the files.
It doesn't always work, but it has definitely helped me extract files from DSK images which the emulator would not recognize.
-(phil-ereaut).jpg)
Transfer utility for David Keil's emulator between the emulator and DOS
These utilities will convert from one virtual format to another.
HxC makes a line of hardware floppy drive emulators that are quite popular. Included in their support downloads is HxCFloppyEmulator, which includes functions to load, convert (including batch processing), browse, and modify disk images. Features include:
As a side note, the Track Analyzer has a feature which allows you to "swap sides" and erase sides. This was especially useful for disks which were written using certain software which mounted a double sided drive as two different drive numbers. It took a lot of people a lot of time to try to figure out what was going on with those disks, and once it was determined what was happening, it was this software that allowed extraction of the second side as its own DMK image!
Also, older versions of this utility had a bug which prevented the program from accurately creating DMK images. The author advised that this has been corrected. If you do run into trouble, please reach out with the images so that further development can be made.
This is a utility that converts from TD0 (Teledisk) or IMD (ImageDisk) to DMK Format. Features include:
While this is a complete ImageDisk package, it includes utilities which will convert from BIN (Binary), DMK (TRS-80 Standard), and TD0 (TeleDisk) to IMG.
Will convert between DSK and DMK formats under Windows (current release within the CW2DMK package cannot run in x64 Windows).
Display the sectors of a DMK image in both hex and ASCII.
A small DMK file editor/viewer which is also able to compare two different DMK files. Works on tracks and sectors only and does not deal with file name or directories. Handles mixed density disks and displays both single-density and double-density sectors, even if they have the same sector numbers.
Displays the CRC for each sector and indicates whether the CRC is bad or not. If you edit a sector the CRC is automatically updated (and corrected). Of course you have to know what you are doing when modifying disk sectors, especially when they contain program files. Can edit using either hexadecimal or ASCII input.
Will display the contents of a CP/M DSK image.
Linux USAGE: ./dskdir MMCPM231.DSK
Mode 1:
This program reads .DSK and DMK files, and displays the disk parameters, such as, Type of Emulator file, No of sides, Density, Tracks, Dual density, Tracks start at sector 1, etc. For Newdos disks, it will show the Pdrive paramters of the disk.
You can step through, and view the sector information, and the sector density for Dual Density disks. Stepping a Newdos disk, the present lump will be displayed Clicking the directory button, will display the start of the directory. Stepping through the directory sectors will show the File names in the directory, and also in colour, the bytes, that show where the files are located on the disk.
Mode 2: Sector display
This mode displays the sector, numbers and Density, on each track, in numerical order, or in the actual interleave order. It also shows the sectors with differing Data address marks. Handy to see the tracks densities, and no. of sectors. On most disks, this can show the Directory sectors, but some early disks have weird combinations of data address marks.
Mode 3: Hex Editor
Will display the Hex and Ascii bytes of any file. This was a for myself, to have a look at the funny files that could not be read by the program. I left it in, as it may be handy for someone. For Emulator Dmk, and JV files, it shows the headers, Blocks, Idams, etc, in different colours to easily identify the set up of these files.
Will scan a DMK image and report back any sectors which are bad. A "bad sector" is one that its stored data CRC doesn't match its computed data CRC.
Will display the PDRIVE settings of any DSK or DMK image which was "formatted" by NEWDOS/80.
NOTE: TRSTools will also do this.
This utility analyzes DSK and DMK files and shows filename, DOS, PDRIVES, Tracks, Density, Sides, Sec/Cyl and SPG. Will also note where Track Sectors start at 1.