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Taking your specific question about keyboard inputs. The computer receives keystrokes along a serial link, therefore the keystrokes are not received simultaneously as they must be - er - serial. WIthin the keyboard itself is a small processor that reads keypresses and sends them out to the computer on the serial link. Let us consider the case where ...


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Each pressing or releasing of the key will be transfered from the keyboard to the computer through the USB cable, so there is no way for the keyboard to send true simultaneous key operations. The keyboard just send messages when a key is pressed or released. The computer will tell the application that two keys are pressed if one "key pressed" message arrives ...



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