IT Services Circle
Jul 11, 2022 · Fundamentals
From Keyboard Press to Screen Display: A Step‑by‑Step Overview of the Computer System
Pressing a key triggers a complex chain of events—from the keyboard’s matrix circuit generating a keycode, through USB polling and kernel interrupt handling, to the X server reading device files, delivering the input to applications, and finally rendering the character on the screen via the framebuffer.
Input HandlingInterruptOperating System
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