4. As we discussed in class, level 3 (the Operating System Machine level) is usually a

hybrid level. Most of the instructions at this level are also in the ISA level, i.e., level 2. Those level 3

instructions that are identical to level 2s are executed directly by the microprogram or hardware control

(at level 2), not by the operating system (at level 3). Is this a good execution choice? Why or why not? (3

+ 7)

Computer Level Hierarchy Level 5 Problem-oriented language level High-level Language Level Translation (compiler) Level 4 Assembly language level Translation (assembler) Where is the hardware-software interface? Level 3Operating system machine level Partial interpretation (operating system) software Level 2 Instruction set architecture level hardware Interpretation (microprogram) or direct execution Level 1 Microarchitecture level Hardware Level O Digital logic level