WARNING: This is an ever-evolving WIP research page full of information that may be out of date or entirely wrong.

Wheel of Fortune Play Along Internals

Inside the Wheel of Fortune TV Play-Along, there are three boards.

The Radofin XM-2296-F2 board of unknown dedication

The LCD Controller (Radofin XM-2305-A)

  • Features two Hitachi surface mount parts:
    • HD44780 Dot Matrix Liquid Crystal Display Controller/Driver
    • HD66100F LCD Segment Driver

The Microcontroller and Keyboard

  • A Mattel branded COP840C 8-Bit CMOS ROM Based Microcontroller (the 2K ROM, 128 bytes RAM configuration)

Unknown Third Board (Radofin XM-2296-F2)

  • Features 3 ICs:
    • LM324 x 2 - Quad-Operational Amplifier
    • LM339 - Quad Differential Comparator


  • Piezoelectric speaker is fastened to the case, with an ID molded in plastic: 7860 BD-2093-1.

"The Sensor"

Looks like a photo-diode with a lens above it.

Likely a photodode?

Misc Images

The COP840C Microcontroller on the MCU/Keyboard board

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This is a research wiki full of information that may be incomplete, inaccurate, or out of date. It is perpetually a work-in-progress.