System Programs
System programs are the basic layer of software built into every
IBM computer. They include the power-on self test (POST), the
basic input/output system (BIOS) code, and the
Configuration/Setup Utility program. POST is a set of tests and
procedures performed every time you turn on your computer.
The BIOS is a layer of software that translates instructions from
other layers of software into electrical signals that the computer
hardware can understand.
In the past, the system programs were stored in a read-only
memory (ROM) module on the system board. Generally, the
contents of ROM modules cannot be modified after they have
been originally programmed. However, a type of nonvolatile
memory referred to as electrically erasable programmable ROM
(EEPROM) can be reprogrammed while it is in the computer and
has replaced the ROM module on the system board in ThinkPad
computers. System programs are stored in a type of EEPROM
module referred to as Flash memory. The contents of Flash
memory can be easily updated with an update (Flash) diskette.
The process of updating system programs is often referred to as
“flashing the BIOS.”
As part of the continuing work to improve quality, IBM might
make changes and enhancements to the system programs.
When updates are released, they will be available on the World
Wide Web (http://www.pc.ibm.com/register) or through the PC
Company Bulletin Board Service in files that can be downloaded
onto a diskette. Instructions for using the system programs
updates will be available in a README file included in the
downloaded files.
When a SelectaDock III system installed with IBM 100/10
EtherJet PCI Adapter with Wake on LAN or IBM Auto Wake
Token Ring ISA Adapter is connected with your computer, the
system programs also can be updated remotely when the
computer is unattended.
Appendix A. Using System Management 195
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