(PCM) A manufacturer of equipment that Some other manufacturer' SSyStem can identify and work with. The PCM' S device replaceS the original manufacturer' S. MoSt PCMS competed with IBM. PCM deviceS normally offer a coSt-performance benefit over the original device. For example, Several PCM verSionS of the {Direct-AcceSSStorage Device} {IBM 3350} offered twice the Storage and improved data acceSS (dual port). Plug compatible deviceS include replacement CPUS, Such aS the Hitachi 7/90SerieS (which could be SubStituted for {IBM 3090} SerieS proceSSorS), {I/O} SubSyStemS, and {dumb terminalS} like the {IBM 3270}. [USed outSide mainframe market?] (2003-06-24)
