Matt Desmond has released an expanded version of his DesTestMAX cartridge called the DesTest MAX-Switch, and Lee from the More Fun Making It channel has showcased the improvements in a recent video. This diagnostic tool, already useful for Commodore 64 repairs, now offers deeper testing and broader coverage.
The original DesTestMax cartridge could run a memory check in MAX mode, a special diagnostic state that operates even if the system’s ROMs or CIAs are missing. However, this first release was limited to just 4KB of RAM. That narrow scope made it effective for quick checks but insufficient for identifying deeper system faults.
With the new release, the DesTestMax MAX-Switch cartridge update takes testing much further. Once the initial 4KB passes in MAX mode, the cartridge can now examine the full memory range of the C64. This greatly improves its usefulness for anyone working on more complex repair cases.
Lee highlights several added functions that make this update stand out. These include:
- ROM checksum verification to confirm chip integrity.
- CIA timer testing to detect potential timing issues.
- Logic chip fault detection to reveal hidden failures in supporting circuitry.
These new checks allow technicians and enthusiasts to pinpoint a wider variety of problems, from faulty ROMs to subtle timing glitches. The expanded functionality makes the cartridge an all-in-one solution rather than just a starting point for repair work.
Lee’s video offers a hands-on look at how the updated cartridge operates and how each new feature works in practice. His demonstration makes clear why this update is a valuable addition to the Commodore 64 repair toolkit.
For those working with aging hardware, the DesTest MAX-Switch cartridge update provides a reliable way to uncover issues that might otherwise go unnoticed. Lee’s walkthrough makes it easy to see how these improvements translate into practical results. Watching the video is recommended for anyone curious about advanced diagnostic tools for the Commodore 64.
