MODEM

Published:2009/7/14 4:51:00 Author:May | From:SeekIC

Developed as part of TV terminal for microprocessor, to permit communication over telephone line with time-sharing computer system. Uses Motorola MC14412 modem chip for full-duplex FSK modulation having originate frequencies of 1270 Hz for mark and 1070 Hz for space, with answer frequencies of 2225 Ha for mark and 2025 Hz for space. AY-5-1012 UART serves as parallel interface to microprocessor. Article covers operation, construction, testing, connection to telephone lines, and use of modem. -R. Lange, Build the S35 Modem, Kil-obaud, Nov. 1977, p 94-96.



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