Modem adapter for use with standard PC parallel port

Details Modem adapter for use with standard PC parallel port Modem adapter for use with standard PC parallel port

1993-12-17

1995-04-18

Richardson, Robert L.

Pulse or digital communications

Repeaters

Testing

375222, 379 97, 3647081, G06F 1300

Patent

active

054086140

ABSTRACT:
A modem adapter for use with a standard parallel port of a personal computer (PC) for interfacing to the public switched telephone network (PSTN). The modem adapter accepts digital data, eight bits at a time, from a standard PC parallel port and modulates this digital data into an analog format, compatible with the PSTN. Conversely, the modem adapter accepts analog data from the PSTN and converts it into digital data and transfers this data to the parallel port, at least four bits at a time. The modem adapter of the present invention thus neither requires any additional circuit cards in the PC's card slots nor dedication of any of the existing serial ports. Redirector software intercepts software I/O instructions directed toward a serial I/O port and redirects and reformats these instructions to the modem adapter through the parallel port. This redirection permits existing modem control software to be used without modification with the modem adapter of the present invention.

REFERENCES:
patent: 4641263 (1987-02-01), Perlman et al.
patent: 4672570 (1987-06-01), Benken
patent: 4682352 (1987-07-01), Durham
patent: 4812847 (1989-03-01), Stewart et al.
patent: 4914688 (1990-04-01), Kobayashi et al.
patent: 5033062 (1991-07-01), Morrow et al.
patent: 5276443 (1994-01-01), Gates et al.
patent: 5299314 (1994-03-01), Gates

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