Computer and peripheral interface circuit

Details Computer and peripheral interface circuit Computer and peripheral interface circuit

1981-12-29

1984-04-03

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

179 4, 375 9, 375 93, H04L 2714

Patent

active

044409877

ABSTRACT:
An interface circuit is disclosed for connecting a digital computer to a modem or other peripheral circuit through either a standard digital signal (RS232) "port" or an audio-frequency "port" normally used by the computer to store and retrieve information on audio-frequency magnetic tapes. The interface circuit allows the modem to be used economically with a small computer which does not have a standard RS232 "port". In order to allow the modem to connect to the audio-frequency "port" the interface circuitry combines filtered audio signals received by the modem from an associated telephone line with RS232 signals generated by the modem decoding circuitry to produce tone bursts which can be decoded by the computer audio-frequency port. The interface circuitry can accept either RS232 signals or tone bursts from the computer to be transmitted by the modem by automatically adjusting an internal threshold level.

REFERENCES:
patent: 2462470 (1949-02-01), Crosby
patent: 3500401 (1970-03-01), Miller et al.
patent: 4065722 (1977-12-01), Francis

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