Question

1) The decimal equivalent of the unsigned 8-bit hex number 0B4H is ______________.

2) The value of the expression ‘H’ – ‘B’ is less than / equal to / greater than that of the expression ‘L’ – ‘C’.

If the .data segment contains declarations.

A BYTE 2 DUP (‘a’), ‘+’

B BYTE 3 DUP (‘b’), 0

C BYTE 4 DUP (‘c’), ‘–’

D BYTE 5 DUP (‘d’), 0

then the instruction input A, D, 6 will display a Windows dialog box with title?

3) If eax = 302B59A1H, and ebx = 700CD37DH, then the instruction add ax, bx will leave what value in the eax register?

Answer 1

ANSWER :

1)

8 bit hex value to decimal value

First split all the bits as shown

0 B 4

Replace each bit with its equivalent 4 bit binay digits.

0 = 0000

B = 1011

4 = 0100

Now, combine all the binary digits obtained above

0B4 = 0000 1011 0100

Represent the power of 2's value, since we are working with 8 bit I am eleminating the 4 bits of MSB

128 64 32 16 8 4 2 1

| | | | | | | |

1 0 1 1 0 1 0 0

Therefore, add all the 1 with its 2's power value

(0B4) hex = (128 + 32 + 16+ 4)

= 180 decimal

Thus the decimal of 8 bit (0B4)H = (180)D

2)

In this we are considering ASCII value and its equivalent hexadeciaml value.

So,

H - B = 72 - 66

because ASCII (H) = 72 Decimal

and ASCII (B) = 66 Decimal

Therefore, 72 - 66 = 6

L - C = 76 - 67

because ASCII (L) = 4C = 76 Decimal

and ASCII (C) = 67 Decimal

Therefore, 76 - 67 = 9

Thus, we can say that, 'H' - 'B' is less than 'L' - 'C'