8/22/2023 0 Comments Transistor keyboard or controller![]() ![]() The IBM PC AT used an Intel 8042 chip to interface to the keyboard. In this case, the controller usually also controls the keyboard's LEDs by sending data back to the keyboard through the wire. If a keyboard is a separate peripheral system unit (such as in most modern desktop computers), the keyboard controller is not directly attached to the keys but receives scancodes from a microcontroller embedded in the keyboard via some kind of serial interface. When data from the keyboard arrives, the controller raises an interrupt (a keyboard interrupt) to allow the CPU to handle the input. ![]() Its main function is to inform the computer when a key is pressed or released. In computing, a keyboard controller is a device that interfaces a keyboard to a computer. Keyboard controller and AT-Keyboard jack on an AT- Mainboard
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