Side Projects Lab introduces a fresh modification for the Commodore 64: Wireless Ultimate II+ Control. This project improves cartridge usability in a living room setup. As a result, the C64 feels much closer to a console.
The Ultimate II+ cartridge already delivers plenty of features. It serves as RAM expansion, floppy emulator, tape drive, and more. Normally, its menu launches from a button on the back of the cartridge. While practical at a desk, this button is awkward when seated on a couch. With the Blue 64 Bluetooth adapter, however, the menu can now be triggered wirelessly.
To begin, the video highlights two small improvements. First, a compact USB thumb drive replaces the large stick that extends from the cartridge. Consequently, the system looks cleaner and less cluttered. Second, a new floppy cable solves the bulky loop of the original design. By using 3D-printed caps and DN6 connectors, a shorter cable fits neatly along the case. Since the design files are shared on GitHub, anyone can replicate this fix with ease.
Next, attention shifts to the main modification. The Blue 64 adapter outputs active-low signals, which makes rerouting the restore key output possible. A quick trace cut and wiring change connect the signal to the cartridge’s menu button. As a result, pressing a mapped button on a Bluetooth controller now opens the Ultimate II+ menu from the couch.
However, one limitation exists. A modified cartridge will not function correctly on an unmodified C64. In this case, the menu button remains grounded, disabling it entirely. Even so, the change causes no harm to the hardware.
Despite this drawback, the benefits stand out. Game switching, disk swaps, and demo launches can all happen without leaving the couch. Therefore, the cartridge becomes a far more comfortable tool for anyone who wants a console-style Commodore 64 setup.
Watch the full video to follow the complete process and see the results.
