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Unit 7 Video

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Unit 7 Video Summary 5
One of the most common uses of Flash memory is for the basic input/out put system of you computer, commonly known as the BIOS. The BIOS makes sure all other chips, hard drives, ports and CPU function together. BIOS is the first program that is activated during the boot, running on ROM, ready only memory. Startup BIOS activates the POST bootstrap loader which runs POST. POST checks the basic system hardware testing memory and assigning system resources. Startup BIOS also check the CMOS, comparing them to the hardware found during POST. CMOS setting are stored in the RAM ( Random Access Memory) and are not permanent as BIOS setting are and can be changed by the user. BOIS and CMOS are different they are stored on different chips. BIOS are stored in ROM and CMOS are stored in RAM. BIOS are permanent, while CMOS are volatile, it can be erased if the power goes off. BIOS cannot be edited by users. CMOS can be edited by users, configuration can be saved. CMOS setting are not lost because of the CMOS battery, providing power during shutdown. Preserves CMOS configuration stored in RAM. If the battery dies the symptoms would be low battery= slow clock, dead battery which means checksum error during boot. The system will reboot once you clear the checksum error. After POST is complete and the CMOS are checked, the BIOS check the MBR (Master Boot Record), which is located on the first sector on the hard drive. MBR finds the activate partition and loads the 1st operating system file. BIOS are referred to as firmware, which is a set if instructions that is in the BIOS chip. BIOS are either hardware or software. EEPROM (Electronically Erasable Programmable Rom) is used to change instructions on the

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