Power-On Self-Test

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 The POST is a ROM program that's executed when the computer is first

 turned ON.  It performs the following functions:



  þ Checks the Switch Settings (PC,XT) or the CMOS Memory (AT,PS/2) to

    determine what peripheral equipment is connected and sets the

    Equipment List bit flags.



  þ Checks RAM and writes data to all addresses (required for RAM error

    detection) and tests components (DMA, interrupt, disk, keyboard, etc.).

    It beeps and/or displays error codes; see POST Error Codes.



  þ Performs ROM-Scan to install add-on firmware and initialize add-on

    hardware.



  þ Executes the bootstrap sequence to load DOS.



  þ Checks CMOS address 0fH (and 40:0072 in the BIOS Data Area) for special

    actions.



See Also: System Startup Sequence

          ROM-Scan

          CONFIG.SYS

          MultiConfig Menus

          DoubleSpace

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