Commodore 64 Games System
The Commodore 64 Games System (often abbreviated C64GS) is the cartridge-based home video game console version of the popular Commodore 64 home computer. It was released in December 1990 by Commodore into a booming console market dominated by Nintendo and Sega.
Source: Wikipedia — Commodore 64 Games System (CC BY-SA 4.0)