Firmware

In computing, firmware is software that is embedded in a hardware device,
that allows reading and executing the software, but does not allow
modification, e.g., writing or deleting data by an end user.

Examples of firmware include:

   * the BIOS found in personal computers.
   * Open Firmware, used in Apple Macintosh computers
   * the computer program in a read-only memory (ROM) integrated circuit
     chip. A hardware configuration is usually used to represent the
     software.
   * the erasable programmable read-only memory (EPROM) chip, which program
     may be modified by special external hardware, but not by an application
     program.

A well known specific example is Source: from Federal Standard 1037C and
from MIL-STD-188

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