The quality of the diagnostic is up to the people who made that particular device.
- Chapter 6 BIOS
- from CompTIA A+ Certification All-in-One Exam Guide, Ninth Edition (Exams 220-901 & 220-902), 9th Edition
- Publisher: McGraw-Hill
- Released: January 2016
The principal duties of the main BIOS during POST are as follows:
verify CPU registers verify the integrity of the BIOS code itself verify some basic components like DMA, timer, interrupt controller find, size, and verify system main memory initialize BIOS pass control to other specialized extension BIOSes (if installed) identify, organize, and select which devices are available for booting
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