When the power is turned on the computer the ROM BIOS begins the boot process by giving commands. Stored in Read Only Memory (ROM), on the BIOS chip, is a small set of software instructions that allow the computer to begin the process of self testing and configuration. These instructions include a series of diagnostics or power-on tests including:

Video Test: initializes the display adapter, tests the video card and video memory, and displays configuration information or any errors. Of course you won’t be able to see these errors if your display is malfunctioning. BIOS Identification: displays the BIOS version, date, and manufacturer. Memory Test: tests the memory chips. A running sum of the amount of memory tested will display up to the to

At this point in booting, the computer is one step from being ready to run applications. The last step is to load the Operating System (OS). The OS is the software system that controls operations of the computer once it is running. The following is part of the process for loading the OS:

Running Programs at Startup with AUTOEXEC.BAT

Configuring the System with CONFIG.SYS

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