The Turbo232 cartridge is a high-speed RS-232c modem interface which allows you to connect standard external modems to your Commodore 64 or 128 computer. When used with appropriate terminal software, this cartridge allows you to connect to communications networks at speeds up to 230,400 bps (230Kbps). The interface plugs easily into the cartridge port of any Commodore 64 or 128 computer, and provides an industry standard DB-9 port for attaching external modems.