The ubiquitous embedded computers are firmly established as the basic electronic component of design that control military systems. Such applications can be found everywhere in the field of military system. A embedded computer is required to redesign when system needs performance upgrade or production-state of processor is NRND or EOL. This paper describes a scheme about impact analysis of designing processor alteration on embedded computer. In this case, hardware architecture and interrupt source of target system must be considered. Also, performance and throughput of that must be analyzed.