The company primarily manufactured modems and sound cards for personal computers for the bulk of its existence.

[1] The company was founded to capitalize on Apple II home computers by providing peripherals and other add-on products.

This replaced the need for numerous analog devices for signal processing circuits customary in modem design at the time.

[2]: 198 [3] In 1992, the company merged with Technology Concepts, Inc., a manufacturer of fax and enhanced voice modems based in Belmont, California.

[5] Prometheus' sound cards soon found use in prebuilt computer systems manufactured by IBM and DEC.[6] Sales of Prometheus' modems cooled considerably in the early 1990s, the company trailing behind the growing pace of advancements in modem bit rates and hampered by quality control issues stemming for slow communication with their Taiwanese manufacturing contract.