This seems like a big, big oversight..
From IMDB...
The computer used in the [Lost in Space] series is the Burroughs B-205. This computer, with its flashing light console and large reel-to-reel tape drives, would appear multiple times in 1960s' motion pictures and television. Among its screen credits are The Angry Red Planet,Voyage to the Bottom of the Sea,The Time Travelers,Dr. Goldfoot and the Bikini Machine,Hogan's Heroes, The Time Tunnel, Batman,Fantastic Voyage, The Green Hornet, Land of the Giants, The Computer Wore Tennis Shoes, The Towering Inferno, The Right Stuffand Austin Powers: The Spy Who Shagged Me.