I created a video of the 1978 Bally Dealer Demo cartridge running for the full two-minutes of the video. This 4K cartridge (#6001) is part of the Functional Series. According to Mike White:
"This cartridge was not sold to the general public and was only produced in limited quantities. The only public sales began in 1983 and came from ABC Hobbycraft (who acquired Astrocade's remaining inventory). The cartridge runs about two minutes and features the "built in" software of the Bally console. Written by Dick Ainsworth."
You can view the video here:
I was pretty surprised to see that a video of this cartridge running isn't already available.