The CPU uses the values of CS and IP registers to find the location of the next instruction to execute. When a HIGH is applied to the pin, the CPU immediately stops, and sets the major registers to these values: The 8086 microprocessors provide RESET pin that is used to do the hardware reset. On some systems (e.g, the PlayStation 2 video game console), pressing and releasing the power button initiates a hard reset, and holding the button turns the system off. Devices may not have a dedicated Reset button, but have the user hold the power button to cut power, which the user can then turn the computer back on. Generally, a hard reset is initiated by pressing a dedicated reset button, or holding a combination of buttons on some mobile devices. However, data may become corrupted if this occurs.
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User initiated hard resets can be used to reset the device if the software hangs, crashes, or is otherwise unresponsive. Hardware resets are an essential part of the power-on process, but may also be triggered without power cycling the system by direct user intervention via a physical reset button, watchdog timers, or by software intervention that, as its last action, activates the hardware reset line (e.g, in a fatal error where the computer crashes). This is typically, but not always, followed by booting of the system into firmware that re-initializes the rest of the system, and restarts the operating system. For the video game, see Hard Reset.Ī hardware reset or hard reset of a computer system is a hardware operation that re-initializes the core hardware components of the system, thus ending all current software operations in the system.
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