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Data exchange -the motherboard

The ROM chips contain instructions, which are specificfor that particular motherboard. Those programs and instructions will remain in the PC throughout its life; usually they are not altered.

Primarily the ROM cod8 holds start-up instructions. In fact there are several different programs inside the start-up instructions, but for most users, they are all woven together. You can differentiate between:

■    POST (Power On Self Test)

■    The Setup instructions, which connect with the CMOS instructions

■    BIOS instructions, which connect with the various hardware penpherals

■    The Boot instrucbons, which cali the operating system (DOS, OS/2, or Windows )

All these instructions are in ROM chips, and they are activated one by one during start-up. Let us look at each part.