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2. [20] Multiple Choice Questions ) When 2 two's complement numbers are added, a carry out of the most-significant bit indicates A) an overflow has occurred B) the result is negative. C) the result is correct as long as the addends are negative. D) None of the above Which of the following is not a legal instruction for the Pentium processor? A) ADD AX, BX B) ADD [AX], BX C) ADD [AX], [BX] D) ADD AX, [BX] b) What is the effect of the following instruction? MOV ECX, [ESI+EAX A) The content of ESI is added to the content of EAX and the sum is stored in ECX B) The content of the memory location whose address is stored in ESI is added to the c) content of EAX. This sum is stored in ECX C) The source operand is stored in memory. The address of this memory location is computed by adding the content of ESI to the content of EAX D) The source operand is the sum of two memory locations. The first memory location's address is stored in ESI, the second's in EAX What is the range of numbers that can be represented by 2's complement, assuming 6 bits are used to store a data? A) [-32,31] B) [-31,32] C) [0,63] D) (1,64] d) How many interrupts can be supported maximally in the protected mode? A) 128 e) B) 256 C) 64 D) 512