a reset circuit of a modem which permits the exchange of digital data with a remote modem in a computer system having an external reset switch provided thereon for allowing a user to reset the modem . the reset circuit includes a decoder section for receiving information from the computer system and decoding the same information to generate a first reset signal ; and a signal output section having a first input terminal coupled to receive occurrence of the first reset signal , and a second input terminal coupled to receive occurrence of a second reset signal generated from the computer system in response to either manual depression of the external reset switch or an execution of a designated program contained in the computer system , for combining occurrence of the first reset signal and the second reset signal to generate a modem reset signal to a reset portion of the modem for resetting operation of the modem .