Entex Select-A-Game Machine (1981)
This obscure machine walks a fine line between handheld and tabletop. Entex designed the SAG for potential two-player action on a table, but during single player matches, it was easy to hold somewhat upright. The Select-A-Game included a "vacuum fluorescent display" with display elements arranged in a 7 by 16 grid.
Entex released only six game cartridges for this system, most notably versions of Pac-Man and Space Invaders. Photo Courtesy Rik Morgan (handheldmuseum.com)