Integrated modem which operates without a dedicated controller

Abstract From the Canadian patent

An embedded modem that does not require a dedicated controller and operates with existing communications software uses the host processor of the computer to interpret new and redefined communications interrupt requests. In response to an interrupt request, the control of the processor is transferred from the communications software to a driver program stored in the main memory for the processor. Under the operation of the driver program, the processor interprets control characters and causes the appropriate commands to be carried out in the modem. Once these commands have been processed the control of, the processor reverts back to the communications program. The processor thereby functions …