Assuming the question relates to a normal personal computer, the answer is: technically, they don't interface at all, at least, not directly.
The keyboard interfaces to the computer through a physical port. Software (device driver) monitors the KB port for keystrokes. Operating System (OS, e.g., Windows XP) interprets what to do with the keystrokes.
OS sends display commands to a graphics driver, which sends hardware commands to the graphics board, which in turn sends signals to the display to display.
If the OS is broken for any reason, the path is broken, and keystrokes do not show up on the display.
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Keyboard?
terminal
Show CDP Interface
a human interface device is the device the human uses to communicate with a computer, like a mouse or keyboard. Human computer interface refers to all of those working together to let the human control the computer.
show ip interface brief
Intel 8279 is a Keyboard/ Display interface which was basically developed for 8085/8086 microprocessors.l
A keyboard is a Human Interface Device. This enables you to enter information and commands into a computer by pressing keys in various sequences.
(Video Display Terminal) An input/output device that contains a screen, keyboard and mouse.
A GUI is a graphical user interface. An input device is any piece of hardware that is used to interact with a computer. e.g. mouse, keyboard, etc. A GUI is usually interacted by utilizing a mouse; but, older software used the keyboard more than the mouse.
FPGA is a programmable device you have to interface this with a display device and input device to get image. Then you can write a logic to process the image for the very particular device. This is little tough job so take support from DSP for more complicated formats.
The Pink Keyboard app simply makes the keyboard on one's mobile device pink. Once installed, the user can restart their phone and a pink keyboard will display whenever one types.