Multiprogrammable input/output circuitry

摘要

A electronic digital processor system input/output circuitry including several input/output data ports where each port contains receiving circuitry to receive bit data from bit data pads and transmitting circuitry to transmit bit data to the data bit pads and control circuitry that provides for a configuration where one input/output port may respond to the address of another input/output port, allowing the second input/output port to perform other functions. This capability would allow a user to execute a program that emulates one configuration while the actual, physical connection of devices is, in fact, another configurations. The input/output circuitry also include control circuitry that determines whether the port is to receive bit data or to transmit bit data. This circuitry is connected to a data bus that couples the input/output data ports to the remaining electronic digital processor system.