This disk has the drivers for the Cardco Cardkey 1 Numeric Keypad.  Both Commodore 64 and VIC-20 drivers are included.  Also on the disk is a compatible calculator program called Calc v1.0 by Steve Fauer & Brett Ricketts.

This is a demo disk full of VIC-20 programs designed to work with the Cardco Cardriter Light Pen.  Here's a link to the documentation and some other resources.