These are some of the keyboards that were often used with the Bally 300-Baud tape interface to create a keyboard for Bally BASIC. A couple of these keyboard interfaces were published in the Astrocade newsletters. Has anyone built one?

ASCII Keyboard (Model Jameco JE 610) These keyboards, from 1979, were often hacked with the 300-BAUD tape interface to create a keyboard that could be used with Bally BASIC. Jameco JE 610 ASCII Keyboard Datasheet

Bally Arcade in Blue Keyboard Case Created by Herb Weintraub. 198x. This Bally Arcade upgrade uses the Key Tronic model L1696 keyboard These pictures are available in PNG format. Also, the schematics for this keyboard are available. Bally Arcade in Blue Keyboard Case (Close-Up) - PNG Format. Bally Arcade in Blue Keyboard Case (On Desk) - PNG Format. Key Tronic Model L1696 Keyboard Schematics - This is a two-page document.