This question is based on the EASY$68$K simulated processor. Assume the contents of all data

and address registers are equal to zero before the start of the program. All numbers are in

hexadecimal.

Demonstrate how instructions of a program are executed by using the E$114$ Processor

Instruction Set of the EASY$68$K simulator.

$($a$)$ Figure Q$3($a$)$ is a program segment for the course's simulated processor. Assume all

numbers are in hexadecimal.

Figure Q$3($a$)$

$($i$)$ The program includes a loop. Which register is being used as a loop counter and

how many times in total will the set of instructions within the loop be executed?

$(2$ marks$)$

$($ii$)$ From which instruction$($s$)$ do you deduce the answers in Q$3($a$)($i$)?$

$(2$ marks$)$

$($iii$)$ The loop picks up successive data items from a block of locations in data

memory. What are the lowest and highest addresses in hexadecimal of the

locations in this block?

$(2$ marks$)$

$($iv$)$ What is the function of the block of instructions that make up the loop in the

program? Do not give a description on an instruction$-$by$-$instruction level; give

the overall task of the loop.

$(3$ marks$)$

$($v$)$ Rewrite the program in Figure Q$3($a$)$ using a subroutine and test its functionality

with the course's simulator. The subroutine should perform the functions of the

loop. The subroutine occupies memory space just below the main program. Use

SUBR as the subroutine address label.