Design of a Prototype Universal Network Interface Device Using INTEL 8086 and 8089 16-Bit Microprocessors

摘要

This research describes the development of a Universal Network Interface Device (UNID II) which is intended to function as a network node in a computer communications network. The UNID II is a 16-bit, 8086 microprocessor based version of the present 8-bit Z80A UNID being developed. In this report the detailed design, construction, and testing of the network module is documented. The network module was designed using the Intel 8086 microprocessor family of components, including an 8089 Input/Output processor. An Intel SBC 86/12A single board computer was used as the local module and its testing is also documented. The test were conducted with the aid of an Intel ICE-86A/88A In-Circuit Emulator. The tests conducted, verified the proper operation of the network module's bus interface circuitry, control circuitry, and DMA transfer capabilities. The shared memory, which is used for intercommunication between the two modules, was also successfully tested. The UNID II was not tested in a computer communications network environment.