Q63

Consider the following program segment for a hypothetical CPU having three user registers $R_1, R_2$ and $R_3.$

$$\begin{array}{|l|l|c|} \hline \text {Instruction} & \text{Operation }& \text{Instruction size} \\&& \text{(in words)} \\\hline \text{MOV $R_1,5000$} & \text{$R_1$} \leftarrow \text{Memory$[5000]$}& \text{$2$} \\\hline\text{MOV $R2,(R1)$} & \text{$R2$} \leftarrow \text{Memory$[(R_1)]$}& \text{$1$} \\\hline \text{ADD $R_2,R_3$} & \text{$R2$} \leftarrow \text{$R_2 + R_3$} & \text{$1$} \\\hline \text{MOV $6000,R_2$} & \text{Memory$[6000]$} \leftarrow \text{$R_2$} & \text{$2$} \\\hline \text{HALT} & \text{Machine Halts} & \text{$1$} \\\hline \end{array}$$

Consider that the memory is byte addressable with size $32$ bits, and the program has been loaded starting from memory location $1000$ (decimal). If an interrupt occurs while the CPU has been halted after executing the HALT instruction, the return address (in decimal) saved in the stack will be