Machine resources are shared by many processes in multiprogramming systems. The suitable environment to run these processes must include devices for address relocation, memory protection, supervisor and user modes of operation and a flexible input/output structure. It is very hard to implement such systems with 8 bits microprocessors, because their performances don`t file the desirable requirements. The 16 bits microprocessors generation, witch began with INTEL 8086, brougth more powerful processors, with performances as good as the small minicomputers processors. Nevertheless, INTEL 8086 was designed for the same applications as the 8 bits processors: dedicated processing and monoprogrammed systems. It doesn´t support multiprogramming applications. This work presents a microcomputer for multiprogramming, based on INTEL 8086. Many facilities are implemented, with external logic, to create a multiprogramming environmen without degenerate the processor performance. This work was supported by CNPq grant 40.2029180 as part of the project MULTIPUC.