These "secret" games were only new to this guy. The Radio Shack TV Scoreboard released in 1976 had a later variant model which came with a light gun and the console had these "secret" skeet and target games. The TV Scoreboard was based on the very same General Instruments AY-3-8500 chip this guy used. I had one of these variant models circa 1980 and it did come with these games, which were extremely lame.
GI also produced a number of other chips featuring different kinds of games like breakout, tank battle, racing and submarine battle. A few of the chips were mostly pin compatible with the AY-3-8500 so you could swap out the chips and play different games, poorly, due to some controls being wired to N/C pins on the 8500 boards. If you hooked up these extra pins to their appropriate controls, you could make a multi-chip capable console. Probably only worth doing it today as a challenge because the games are really boring and have very little re-play value.
I agree, I remember the light gun games too. It was just a different time when being forced to buy an extra piece for your (expensive) new game system may have put a dent in the new industry. It was easier and friendlier to the vendor to have a more expensive version with all the extras.
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