Why is RET is an emulated instruction but RETI is not?

RET (return from subroutine) is an emulated instruction because its execution involves handling the return address and potentially changing the CPU state or context, which can vary based on different execution environments. In contrast, RETI (return from interrupt) is not emulated because it is directly supported by the hardware, allowing it to efficiently restore the previous execution state and enable interrupts, ensuring that the system can handle interrupts quickly and reliably. The distinction lies in the complexity and requirements of returning from different types of calls or states.