Microcode

A PROM chip that does not have its contents “burned in” at the factory as is done with standard ROM chips. Instead, special functionality is installed that allows the end user to burn in the contents of the chip.
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Program recorded in permanent or semipermanent computer memory. Software or computer instructions that have been permanently encoded into the circuits of semiconductor chips. Software that is stored in a ROM chip.
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A compact disk, similar to an audio compact disk, which is used to store computer information (e. g. , programs, data, or graphics).
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Memory that can be read but cannot be written to.
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A defined set of software components that have been evaluated and whose continuous operation has been determined essential for safe, reliable, and secure operation of the system. Critical software is composed of three elements: (1) safetycritical and safetyrelated software, (2) reliabilitycritical software, and (3) securitycritical software.
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