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// This file is part of www.nand2tetris.org
// and the book "The Elements of Computing Systems"
// by Nisan and Schocken, MIT Press.
// File name: tools/builtIn/Keyboard.hdl
/**
* The keyboard (memory map).
* Outputs the code of the currently pressed key.
*
* The built-in chip implementation has two side effects supplied
* by the simulator. First, the keyboard memory map is continuously
* being refreshed from the physical keyboard unit. Second, it
* displays a keyboard icon and data entry GUI.
*/
CHIP Keyboard {
OUT out[16]; // The ASCII code of the pressed key,
// or 0 if no key is currently pressed,
// or one the special codes listed in Figure 5.5.
BUILTIN Keyboard;
}
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