controle de modens

A modem device driver, particularly for use in a receiver/decoder for a broadcast digital television system in which received signals are passed through a receiver to the receiver/decoder and thence to a television set. The receiver/decoder is controlled by a virtual machine (VM) which includes a run time engine (RTE). The receiver/decoder includes a plurality of interfaces to external units, and logical driver devices for the interfaces. A device driver for controlling a modem interface comprises a buffer memory for receiving messages, a control memory for storing control parameters, and a logic unit for controlling the device driver and the flow of messages. The logic unit includes a comparator for matching Event, ACK, and NACK patterns stored in the control memory against the end of messages stored in the buffer memory.