Commodore Modem Chips 1600 Vicmodem MC14412 Motorola 600 baud modem 1650 Automodem 1660 310476-01 Magic Modem TI-1660 U1 TMS99532 Texas Instruments 300 baud modem 1660 310476-06 Magic Modem 1660 IC1 MM74HC942N National Semiconductor 300 baud modem 1670 310476-02 U.S. Robotics Inc. U6 24 pin USR U100 16-255 U5 80C49 MSM80C49-142RS U4 80C49 M80C49-206 1670 310476-04 Commodore CR-1670 Modem U4 28 pin (C)USR86 USR101 16-249 U3 80C49 (C)USR'85 C49-388 U2 80C49 (C)USR'85 C49-387