Question

QUESTION 18 The following is a valid instruction? ADD BL,CX True False QUESTION 19 The following is a valid instruction? SUB 5,AL True False QUESTION 20 Write a valid instruction that adds the 16bit value n the A register to the 16bit value in the B register and places the result in the A register. Be sure to use 16bit registers. QUESTION 21 What instruction does nothing but modify the ElP register when executed? QUESTION 22 register and and the 32 bit A register and places the result in the D register Write an instruction that performs a bitwise or on the contents of the 32 bit

Answer 1

18. Correct Instruction is ADD BL, BX as BX is the base register whereas CX is the count register.

       Answer : False

19. SUB 5, AL

     Syntax for SUB Instruction is SUB destination, source

     Destination cannot be 5

     Answer : False

20. ax and bx are 16 bit registers

mov ax, A

mov bx, B

add ax, bx

add ax, 30h

21. Extended Instruction Pointer(EIP) register has address of next instruction which is to be executed. EIP cannot be changes or accessed directly without the use of control statements such as jumps, loops, calls, etc

Example

JMPZ

LOOP X

22. 32 bit registers are eax and ebx

MOV eax, D

MOV ebx, A

add eax, ebx

MOV D, eax