"The Video Encyclopedia"
By Larry Langman
Copyright 1983
ISBN 0-8240-9108-6

Bally/Astrocade related excerpt from page five (this is from a glossary of 
defined terms):

Astrocade:  The company that took over Bally's Professional Arcade video game 
system in 1980.  Originally called ASTROVISION, the name was changed in 1982 to 
Astrocade.  It now offers about 75 different game and educational cartridges.  
The system contains a built-in calculator/keypad, two eight-way controllers, 
remote game selection, a cartridge storage space, BASIC programming cartridge, 
keypad overlay, light pen connector and three built-in games.  Because of the 
system's computer-like features, the owner has full programmability and, with 
an optional interface, can connect the game console to an audio cassette 
recorder.  This latter feature permits inexpensive recording of programs as 
well as playback of other games.