C64 Ultimate Utility Buttons

As seen in Compute!'s Gazette (March 2026)!

Note:  New batches are usually stocked every few days, though can sell out quickly.  The timing of each release varies, so don't worry if you miss due to time zone or personal schedule!  More are continuously being made.

This module adds dedicated utility buttons to your Commodore 64 Ultimate for convenience and functionality. With a quick reach to the back of the computer you no longer have to remember special presses of the multi-function power switch to access the Menu, Reset, or Special functionality. (The latter is used by cartridge images where the physical cartridge had a button, notably "freezer" cartridges such as Super Snapshot or Action Replay.)

Installation

The module installs with no drilling, fasteners, or adhesives. Refer to Appendix G of the C64U User's Guide for connector locations as needed.

1. Disconnect the power cable (and probably all others) from the computer.
2. Open the computer case by removing the three screws along the front of the bottom. They can be tight from the factory. Use the appropriate size screwdriver to avoid damage.
3. Disconnect the keyboard and LED cables to remove the top of the case.
4. Connect the buttons device to the four-pin "Buttons" connector on the mainboard, to the left of the FPGA board (No. 16 in the user's guide). Orient it so that the black or red wire connects to the pin labeled GND.
5. Slide the buttons module into the open switch slot between the audio (No. 5) and cartridge (No. 4) connectors. The tapered side of the retainer should face downward. For early units with a rectangular retainer: If it won't go in, try turning the module over so that the textured edge of the retainer faces downward. Also see below...
6. Replace the top of the case, reconnecting the LEDs and keyboard.
7. Replace the three case screws.
8. Reinsert the power and other cables.
9. Power on and enjoy!

Note that the button module's retainer should slide down between the audio daughterboard and C64 case so that the top of the retainer sits flush with the top edge of the C64 case. If it doesn't, try one of the following (should only be applicable to early units with a thick rectangular retainer):

• Temporarily loosen the motherboard screws and slide it forward a small amount to create more space.
• Trim down the lower part of the retainer so that it can fit in the gap.

Functions

The mainboard connector labels the button connections as "Left", "Middle", and "Right", and this is how they map to the physical buttons. In the normal/default configuration these correspond to:

Thanks

Special thanks to MonroeWorld for the video review!