The First PC Modem
After the Carterfone decision, non-Bell companies began selling computer modems. One of the most notable for our purposes was the Hayes 80-103A, a 300-baud Bell 103A-compatible modem that happened to be the first modem created for a personal computer. Dale Heatherington (shown here) and Dennis C. Hayes designed it for S-100 bus computers of the day, such as the Altair 8800 and the IMSAI 8080.
Photos: Dale Heatherington