Consider a computer system that contains an I/O module controlling a simple key-board/printer teletype. The following registers are contained in the processor and con-nected directly to the system bus: INPR: Input Register, 8 bits OUTR: Output Register, 8 bits FGI: Input Flag, 1 bit FGO: Output Flag, 1 bit IEN: Interrupt Enable, 1 bit Keystroke input from the teletype and printer output to the teletype are controlled by the I/O module. The teletype is able to encode an alphanumeric symbol to an 8-bit word and decode an 8-bit word into an alphanumeric symbol. Describe how the processor, using the first four registers listed in this problem, can achieve I/O with the teletype. Describe how the function can be performed more efficiently by also employing IEN.