BIOS and CMOS. Chapter 5. Overview. In this chapter, you will learn to Explain the function of BIOS Distinguish among various CMOS setup utility options Describe option ROM and device drivers Troubleshoot the power-on self test (POST). Historical/Conceptual. We Need to Talk.
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Keyboard controller chip
Non-volatile (stays same after power off)
Can be changed by “flashing”
Typically 64 K of programs (though Flash ROM is much bigger)
Often a separate chip
Volatile (kept alive with battery)
Changed via CMOS setup
Typically 128 K of data (though chip size is typically 64 K)
Often on SouthbridgeBIOS vs. CMOS
We have met the enemy and he is us.