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A computer uses the following interfacing protocol for the keyboard: when the end user types a character on the keyboard, the keyboard controller sets the LSB of its 8-bit status register (label keybd status) to 1 and updates the data register (label keybd data) with the ASCII code of the typed character. The device driver resets the status bit to 0 after reading the character. (a) (1 point) What type of IO transfer scheme is employed in this interfacing protocol

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