The NEG instruction in MARIE replaces the value in the AC register with its negation in twos

complement. For example, if the AC register has the value $0123,$ then NEG would store the

value $0$xFEDD in the $AC$ register.

Show the RTN instructions that are used to process the NEG instruction. Include the RTN for

fetching as well. See slides for examples.

Hint: All of the values that you need are already in registers. No additional fetches are nec$-$

essary.