![Fathom [Model 1233] Fathom [Model 1233]](images/marquees/5357.jpg)
Fathom © 1981 Bally.
Bally MPU AS-2518-35 (Squawk and Talk)
Model Number : 1233
Main CPU : M6800 (@ 475 KHz)
Sound CPU : M6802 (@ 895 KHz)
Sound chips : General Instrument AY8910 (@ 895 KHz), DAC, Texas Instruments TMS5220 (@ 640 KHz)

Released in August 1981. 3,500 units were produced.
The development of this game took 8 months (started in December 1980).