Instructions and information can be found on bwack Versa64Cart github page.
Versa64Cart is designed to be a modern easy-to-use cartridge development board for Commodore 64 and Commodore 128 hobbyists and hackers. The versatile design of the PCB allows for flexible implementation of various cartridge types. Whether it’s a simple cartridge backup of an 8k game or a switchable multi-program diagnostic cartridge, Versa64Cart has you covered.
Supported EPROMS are: 27C64 (8k), 27C128 (16k), 27C256 (32k), 27C512 (64k).
Please see the documentation for more information.