Design an adder for excess-3 decimal digits using a ROM. Add two excess-3 digits and give the excess-3 sum and a carry. For example, XXXXXXXXXX = 0110 with a carry of XXXXXXXXXX = 13). Draw a block...

 Design an adder for excess-3 decimal digits using a ROM. Add two excess-3 digits and give the excess-3 sum and a carry. For example, 1010 + 1001 = 0110 with a carry of 1 (7 + 6 = 13). Draw a block diagram showing the required ROM inputs and outputs. What size ROM is required? Indicate how the truth table for the ROM would be specified by giving some typical rows.