Updating the POST/BIOS
POST/BIOS is the basic layer of software built into every IBM computer. POST
(power-on self-test) is a set of tests and procedures that is performed every time you
turn on your computer. The BIOS (basic input output system) is a layer of software
that translates instructions from other layers of software into electrical signals that
the computer hardware can understand. Also included in the POST/BIOS is the
Configuration/Setup Utility program, which enables you to view and change the
configuration and setup of your computer.
In the past, the POST/BIOS was contained in a read-only memory (ROM) module
on the system board. If you wanted to update POST routines, BIOS instructions,
and the Configuration/Setup Utility program, you had to disassemble the computer
and replace modules, or you had to replace the system board. Now, a module
called electrically erasable programmable read-only memory (EEPROM, also referred to as
flash memory) has replaced the ROM module on the system board. You can easily
update POST information, the BIOS code, and the Configuration/Setup Utility
program in your computer from an update diskette. This procedure is often
referred to as flashing the POST/BIOS.
If your computer is properly connected to a network, you can update the
POST/BIOS over the network. For further information, refer to “Update
POST/BIOS from Network” on page 69.
As part of the continuing work to improve quality, IBM might make changes and
enhancements to the POST/BIOS. When updates are released, they are available via
download files on the World Wide Web (http://www.pc.ibm.com) or through the
PC Company Bulletin Board Service (see “Using Electronic Support Services” on
page 109). Instructions for using POST/BIOS updates will be available in a
README file included in the download files.
Chapter 3. Operating Your Computer 33
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