Trace the execution of the following Simple Computer Assembly program. As each line is executed record the values stored in the given register or variable in a table formatted as per the table below the program. Assume that you are recording the state at the very end of the fetch-execute loop. Note: All values in the IR (Instruction Register) column of the CPU Table must be recorded in hexadecimal (base-16)!
Simple Computer Code
\begin{tabular}{|c|c|c|c|c|} \hline ADDRESS & LABEL & OPERATION & MODE & OPERAND \\ \hline 0x00 & & LOAD & A & x \\ \hline 0x01 & & MODI & A & 5 \\ \hline 0x02 & & SUBI & A & 3 \\ \hline 0x03 & & JUMPIFZERO & & else \\ \hline 0x04 & & LOAD & A & y \\ \hline 0x05 & loop & JUMPIFZERO & & after \\ \hline 0x06 & & LOAD & A & y \\ \hline 0x07 & & LOAD & B & total \\ \hline 0x08 & & ADD & REG & \\ \hline 0x09 & & STORE & A & total \\ \hline 0x0A & & LOAD & A & y \\ \hline 0x0B & & SUBI & A & y \\ \hline 0x0C & & STORE & A & y \\ \hline 0x0D & & JUMP & & loop \\ \hline 0x0E & else & LOAD & A & x \\ \hline 0x0F & & LOAD & B & x \\ \hline 0x10 & & MUL & REG & \\ \hline 0x11 & & MUL & REG & \\ \hline 0x12 & & STORE & A & total \\ \hline 0x13 & after & LOAD & A & total \\ \hline 0x14 & & WRITE & & \\ \hline 0x15 & & HALT & & \\ \hline 0x16 & x & & & 4 \\ \hline 0x17 & y & & & 3 \\ \hline 0x18 & total & & & 0 \\ \hline \end{tabular} CPU Table \begin{tabular}{|l|l|l|l|l|l|l|l|} \hline TIME & \multicolumn{1}{|l|}{ A } & \multicolumn{1}{|c|}{ PC } & \multicolumn{1}{|l|}{ I } & TOTAL \\ \hline 0 & 0 & 0 & - & 0 & 4 & 3 & 0 \\ \hline 1 & & & & & & & \\ \hline 2 & & & & & & & \\ \hline 3 & & & & & & & \\ \hline 4 & & & & & & & \\ \hline 5 & & & & & & & \\ \hline 6 & & & & & & & \\ \hline 7 & & & & & & & \\ \hline 8 & & & & & & & \\ \hline 9 & & & & & & & \\ \hline 10 & & & & & & & \\ \hline 11 & & & & & & & \\ \hline 12 & & & & & & & \\ \hline 13 & & & & & & & \\ \hline 14 & & & 0 & & & & \\ \hline 15 & & & & & & & \\ \hline 16 & & & & & & & \\ \hline 17 & & & & & & & \\ \hline 18 & & & & & & & \\ \hline 19 & & & & & & & \\ \hline 20 & & & & & & & \\ \hline 21 & & & & & & & \\ \hline 22 & & & & & & & \\ \hline 23 & & & & & & & \\ \hline 26 & & & & & & & \\ \hline \end{tabular} \begin{tabular}{|c|c|c|c|c|} \hline ADDRESS & LABEL & OPERATION & MODE & OPERAND \\ \hline 0x00 & & LOAD & A & x \\ \hline 0x01 & & MODI & A & 5 \\ \hline 0x02 & & SUBI & A & 3 \\ \hline 0x03 & & JUMPIFZERO & & else \\ \hline 0x04 & & LOAD & A & y \\ \hline 0x05 & loop & JUMPIFZERO & & after \\ \hline 0x06 & & LOAD & A & y \\ \hline 0x07 & & LOAD & B & total \\ \hline 0x08 & & ADD & REG & \\ \hline 0x09 & & STORE & A & total \\ \hline 0x0A & & LOAD & A & y \\ \hline 0x0B & & SUBI & A & y \\ \hline 0x0C & & STORE & A & y \\ \hline 0x0D & & JUMP & & loop \\ \hline 0x0E & else & LOAD & A & x \\ \hline 0x0F & & LOAD & B & x \\ \hline 0x10 & & MUL & REG & \\ \hline 0x11 & & MUL & REG & \\ \hline 0x12 & & STORE & A & total \\ \hline 0x13 & after & LOAD & A & total \\ \hline 0x14 & & WRITE & & \\ \hline 0x15 & & HALT & & \\ \hline 0x16 & x & & & 4 \\ \hline 0x17 & y & & & 3 \\ \hline 0x18 & total & & & 0 \\ \hline \end{tabular} CPU Table \begin{tabular}{|l|l|l|l|l|l|l|l|} \hline TIME & \multicolumn{1}{|l|}{ A } & \multicolumn{1}{|c|}{ PC } & \multicolumn{1}{|l|}{ I } & TOTAL \\ \hline 0 & 0 & 0 & - & 0 & 4 & 3 & 0 \\ \hline 1 & & & & & & & \\ \hline 2 & & & & & & & \\ \hline 3 & & & & & & & \\ \hline 4 & & & & & & & \\ \hline 5 & & & & & & & \\ \hline 6 & & & & & & & \\ \hline 7 & & & & & & & \\ \hline 8 & & & & & & & \\ \hline 9 & & & & & & & \\ \hline 10 & & & & & & & \\ \hline 11 & & & & & & & \\ \hline 12 & & & & & & & \\ \hline 13 & & & & & & & \\ \hline 14 & & & 0 & & & & \\ \hline 15 & & & & & & & \\ \hline 16 & & & & & & & \\ \hline 17 & & & & & & & \\ \hline 18 & & & & & & & \\ \hline 19 & & & & & & & \\ \hline 20 & & & & & & & \\ \hline 21 & & & & & & & \\ \hline 22 & & & & & & & \\ \hline 23 & & & & & & & \\ \hline 26 & & & & & & & \\ \hline \end{tabular}
