ADAMLink 300 Baud Internal Modem

A modem let the ADAM talk to other computers over an ordinary telephone line — in the 1980s that meant dialing into bulletin board systems (BBSs) and online services. This Coleco ADAMLink modem is a full-duplex, 300-baud (about 30 characters per second) auto-dial unit that connects straight to the phone line, with no separate interface box or acoustic "receiver cup" coupler required. It follows the Bell 103 standard, so it could communicate with the many other 300-baud modems of the day.

The card installs in expansion slot #1 — the slot Coleco reserved for communications — and a special Coleco modem cable routes out through the ventilation slots in the top expansion door to reach the telephone jack. It includes the ADAMLink terminal software used to dial, connect, and transfer files.