- Write a single logical (AND, OR, NOT, XOR) instruction to do each of the following:

(1)

عيمجتلا ةغلب ةجمربلاو تابساحلا ميظنت -٣

١٤٠١٢١٤ 2^nd S em ester 1 43 0/143 1 Q u iz 6 M onda y 31M a y 20 10 ـھ١٤٣١يناثلاىدامج١٧ 1

Name: ID:

Fill the table below with the Hexadecimal values of AX and carry Flag (CF) after execution:

Instruction

Before execution After Execution

AX CF AX CF

ROL AX, 9 45A3 0

RCR AX, 5 4BA3 0

- Write a single logical (AND, OR, NOT, XOR) instruction to do each of the following:

1) Complement the least three bits of AL.

2) Clear (make zero) the middle 4 bits of AL.

3) Assume AL is an unsigned odd number, decrement the number by one.

- Write a single shift (SHL, SHR, SAR, SAR) instruction to do each of the following:

1) Assume BL is a negative number with 4 zeros in its least significant bits; divide its value by 4.

2) Multiply the value in BL by 2.

3) Divide BL by 8, assuming it is a positive number of two hexadecimal digits and least significant digit is 0h.

(2)

عيمجتلا ةغلب ةجمربلاو تابساحلا ميظنت -٣

١٤٠١٢١٤ 2^nd S em ester 1 43 0/143 1 Q u iz 6 M onda y 31M a y 20 10 ـھ١٤٣١يناثلاىدامج١٧ 2

Suppose that AX = 1234h, BX = 5678h, CX = 9ABCh and SP = 0100h. Give the Hexadecimal contents of AX, BX, CX, SP and TOS (the word on top of the stack) after executing each of the following instructions:

PUSH AX

AX BX CX SP TOS content

PUSH BX

POP AX

POP CX

What is the value of CX after running the following code:

MOV CX, 0 MOV AX, 4 DEC AX DEC AX Adnan: INC CX

SUB AX, 1 JZ Go_out JMP Adnan Go_out: MOV AX, 9

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Circle in front of statements if they are true (T) or false (F)?

1) T F Macro invocation is done at run time, however, procedure invocation is done at assembly time.

2) T F Macro is always preferred when compared to procedures, because Macro executes faster and consumes less memory space while procedures are very old unused techniques.

3) T F Input/Output devices are assigned addresses in the range of the first 64K byte in the same memory address map. In order to distinguish between the addresses used by the I/O devices and those used by the memory, I/O addresses are called ports.

4) T F Interrupts can be initiated by both software and hardware. However, procedures can be initiated only by software.

5) T F Interrupt Service Routines are loaded by the application programs different than procedures which are memory resident and normally cannot be changed.

6) T F Interrupts are identified by names while procedures are identified by numbers.