Gameboy Color Overclocker Flex

***US customers – All import duties are included in the cost, there will be no additional fees to pay on delivery***

robot_retro GBC Overclocker Flex Mod

Easily overclock or underclock your Game Boy Color to speed up or slow down gameplay with a simple, streamlined installation.

Key Features

• Supports adjustable clock speeds at 30%, 50%, 75%, 130%, 150%, and 170% of the base clock.
• Increase speed: Press Select and the Up Button together
• Decrease speed: Press Select and the Down Button together
• Optional LED indicator:
  • Power LED blinks faster when overclocked
  • Power LED blinks slower when underclocked
  • Solid red LED at base (stock) speed
• Works with flash carts.
• Top speed limits configurable to 170%, 150%, or 130% depending on your screen setup:
  • Default max speed: 170% (OEM original screen)
  • Bridge solder jumper S1 to limit max speed to 150%
  • Bridge solder jumper S2 to limit max speed to 130% (Funny Playing Laminated RP 2.0, Q5 non-laminated)
  • Not compatible with OLED screens 

Other Benefits

Ultra-low power consumption: <15mA (measured with Nordic Power Profiler Kit II)

Extremely accurate base clock: 8.388 MHz ±0.01%, matching the original GBC crystal at stock speeds

Installation Instructions

Multicoloured wire is included to aid with the install.

1. Remove the original GBC crystal.  (Recommended: Use a hot air station for clean removal)
2. Install the flex mod as per the photos.
3. Solder the 3 points highlighted in pink circles.  These are to Test Point VDD5, the power switch and the old crystal footprint.  Note, the flex PCB needs to be wrapped around the board to get to Test Point VDD5.
4. Run wires to the 3 test points shown as the red, pink and green wires. Test points are labelled as P02, P03 and P12.
5. Use flux for best soldering results.
6. (Optional) To enable the LED speed indicator, solder the blue wire as shown to the positive LED leg.
   

Speed Limiting Jumpers

• Bridge solder jumper S1 to cap speed at 150%
• Bridge solder jumper S2 to cap speed at 130%

Developed in collaboration with RJS FPGA.