bell103

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cstroie / Arabell300

Arabell300 is an Arduino-based 300 baud modem implementing Bell 103 and ITU V.21 standards. Features Hayes-compatible AT commands, AFSK modulation, DTMF dialing, EEPROM configuration profiles, and full-duplex communication. Perfect for vintage BBS systems.

arduino modem afsk bell103 itu-v21 hayes

Updated Aug 18, 2025
C++

brucemack / bell103-host-hw

Star

KiCad Schematic/PCB layout for the Bell 103 Subscriber Loop Simulator

modem bell103

Updated Aug 20, 2023

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