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

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

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

• 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.

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