Convert ARC to REL

Understanding ARC and REL file formats

ARC files are compressed archive files, commonly used in the past for bundling and compressing multiple files into a single package. The ARC format was popular in the 1980s and early 1990s, especially on DOS systems, but has since been largely replaced by more modern formats like ZIP and RAR.

REL files, on the other hand, are relative file formats primarily associated with Commodore 64 and other vintage computing platforms. REL files are used to store data in a way that allows for random access to records, making them suitable for database-like applications on these systems.

Why convert ARC to REL?

Converting an ARC archive to a REL file is a niche process, typically required for retrocomputing enthusiasts or those working with legacy data on Commodore systems. The conversion usually involves extracting files from the ARC archive and then importing or converting the relevant data into the REL format for use on compatible hardware or emulators.

How to convert ARC to REL

1. Extract files from the ARC archive: Use a tool like WinRAR, 7-Zip, or Unarc to open and extract the contents of the ARC file.
2. Prepare the data for REL conversion: Identify the file(s) you wish to convert to REL format. If the data is not already in a compatible structure, you may need to reformat it (for example, as a CSV or binary file).
3. Convert to REL format: Use a Commodore 64 emulator such as VICE or a disk image tool like DirMaster (by Style) to create a new REL file. In DirMaster, you can create a new disk image, add a REL file, and import your data. Alternatively, use BASIC or machine code utilities within the emulator to write data into a REL file structure.

Recommended software for ARC to REL conversion

• 7-Zip or WinRAR – for extracting ARC archives.
• DirMaster – for creating and editing REL files on Commodore disk images.
• VICE – for emulating Commodore 64 and working with REL files in a virtual environment.

Step-by-step example using DirMaster

1. Extract the ARC file using 7-Zip (Right-click → Extract Here).
2. Open DirMaster and create a new disk image (File → New Disk Image).
3. Add a new REL file (File → New File → REL), specifying the record length and number of records.
4. Import or manually enter the extracted data into the REL file.
5. Save the disk image for use in a Commodore 64 emulator or on real hardware.

Conclusion

While converting ARC to REL is not a common task, it is possible with the right tools and some manual steps. 7-Zip and DirMaster are the best choices for handling ARC extraction and REL file creation, respectively.