Difference between bios and dos functions
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BIOS stands for Basic Input/Output System, while DOS stands for Disk Operating System. BIOS is considered "Firmware" because it retains the bit data within it after the machines power is turned off (EEPROM). The BIOS is the sub-layer of machine code that allows an AT style computer to
start
running. When you have a PC in front of you with its power off, what you have is all the
hardware
in one place in a configuration necessary to allow a (Powerful) digital computer to come to life in front of you. Let's imagine we've removed the BIOS chip. Now let's apply power. The computer would sit there doing nothing. Even though DOS (or Windows XX) may be installed on some external storage device, the hardware has no way of knowing this
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