(PCM) A manufacturer of equipment that some other
manufacturer's system 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-Access Storage Device IBM 3350 offered twice the storage and improved data
access (dual port).
Plug compatible devices include replacement CPUs, such as
the Hitachi 7/90 series (which could be substituted for IBM 3090 series processors),
I/O subsystems, and dumb terminals like the
IBM 3270.