Jim Groom

How to connect a Commodore 64 or 128 to a modem - The Silicon Underground

The Aprotek Minimodem-C24, at 2400 bps, was the fastest modem that plugged straight into a Commodore without an interface. With an interface, any Hayes-compatible modem will work just fine, keeping in mind the hardware limitations. Novaterm was the name of a C-64 program that could go to 4800 baud with an ordinary RS-232 interface. DesTerm could reach 9600 baud on a C-128, since the 128 had a faster CPU. Most software didn’t support the 6551-based cartridges, but Novaterm and DesTerm did, so you can use the same program with a 6551 to get higher speeds out of a Commodore with an RS-232 (serial) modem.