MICROPROCESSOR AND INTERFACING
ASSIGNMENT NO. 1(EEN-208)
Q1. Select an ADD instruction that will :
(a) Add BX to AX
(b) Add 12H to AL
(c) Add 22H to CX
Q2 Add the data addressed by SI to AL Select an instruction that adds BX to DX and also adds
the contents of the carry flag (C) to the result.
Q3. Select a SUB instruction that will :
(a) Subtract BX from CX
(b) Subtract 0EEH from DH
(c) Subtract DI from SI
(d) Subtract the data address by SI from CH
Q5. Suppose that DS = 1200H, BX = 0100H, and SI = 0250H. Determine the address accessed by
each of the following instructions, assuming real mode operation :
(a) MOV [100H], DL
(b) MOV DL, [BX + 100H]
Q6. Suppose that DS = 1100H, BX = 0200H, LIST = 0250H, and SI = 0500H. Determine the address
accessed by each of the following instructions, assuming real mode operation :
(a) MOV CL, LIST[BX + SI]
(b) MOV CH, [BX + SI]
Q7. If AX = 1001H and DX = 20FFH, list the sum and the contents of each flag register bit(C, A, S,
Z, and O) after the ADD AX, DX instruction executes.
Q8. Develop a short sequence of instructions that adds AL, BL, CL, DL, and AH. Save the sum in
the DH register.
Q9. Develop a short sequence of instructions that adds AX, BX, CX, DX, and SP. Save the sum in
the DI register.
Q10. Write a short sequence of instructions that subtracts the numbers in DI, SI, and BP from the
AX register. Store the difference in register BX
Q 11. Suppose that DS = 1000H, SS = 2000H, BP = 1000H, and DI = 0100H. Determine the memory
address accessed by each of the following instructions, assuming real mode operation :
(a) MOV AL, [BP+DI]
(b) MOV CX, [DI]
Q12. Write a short sequence of instructions that divides the number in BL by the number in CL,
and then multiples the result by 2. The final answer must be a 16-bit number stored in the
DX register.
Q13. Select an AND instruction that will :
(a) AND BX with DX and save the result in BX
(b) AND 0EAH with DH
(c) AND DI with BP and save the result in DI
(d) AND the data addressed by BP with CX and save the result in memory.
(e) AND the data stored in four words before the location addressed by SI with DX and save
the result in DX
