1. Given one 2-to-4 decoder and a sufficient number of tri-state buffers, design a 4-bit 4-to-1 multiplexer.
2. For the system shown below, write the control signals for the following sequence of operations (a) load a value into register A from the keyboard; (b) load a value into register B from the keyboard; and (c) swap the values in the two registers in multiple steps.
3. For the system shown above, add a memory element whose contents can be copied into any of the two register under control.
4. Design a circuit using a decoder and OR gates (like a PLA structure) for 4-bit to 7-segment display.
5. Design a circuit using a 4-1 MUX to implement function F (you have to think what variables to use for selection.
