The playfield of pinball table goes underneath the monitor, making the best possible use of the space. The display of the video game portion is then a 10' monitor, housed horizontally. The difference is that where the monitor would traditionally sit (in the bottom of the cabinet, facing up), is a compact pinball table. Its form factor is hardly any different to a standard upright arcade machine. The machine itself is noteworthy as a brilliant piece of design. So while Namco gave us Super Pac-Man, Bally/Midway produced games like Ms Pac-Man and it is that spin-off that spawned Baby Pac-Man, a character who first appeared in the intermissions of Ms Pac-Man, courtesy of a stoke (what else?).
After the initial success of Pac-Man in the arcades, development of the sequels was split between the original developers (Namco) and the US/EU distributors (Bally/Midway).