This work develops a new technique for interfacing the data exchange between the microprocessor-based systems and the external devices. This technique exploits the great capacity of interfacing of Extended Physical Addressing and uses the technique of Direct Memory Access (DMA), increases the frequency of the new bus and improves the speed of data exchange. This Fast Physical Addressing, based on the use of software/hardware system in the microprocessor-based system, has two aims. First, the management of a large external memory capacity, with a reduced use of physical addresses of the microprocessor-based system. Second, the increase of the data exchange speed compared to the Extended Physical Addressing. While using this architecture in microprocessorbased system or in computer, the input of the hardware part of our system will be connected to the bus system, and the output, which is a new bus, will be connected to an external device. The new bus is composed of a data bus, a control bus and an address bus.