Part of the Programming glossary:

Microcode is programming that is ordinarily not program-addressable but, unlike hardwired logic, is capable of being modified. Microcode may sometimes be installed or modified by a device's user by altering programmable read-only memory ( PROM ) or erasable programmable read-only memory ( EPROM ).

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IBM uses this term in preference to firmware .

This was last updated in April 2005
Posted by: Margaret Rouse

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