KF University of Petroleum and Minerals
Electrical Engineering Department
EE 390-Assignment (3)
1) Write a program segment to convert the packed BCD number in AL to unpacked numbers in
AX. (For example, if AL=37 then the program will make AL=07 and AH=03).
2) Write a program that checks for negative numbers in an array of 100 bytes. The array starts at
0A000 H. The program should take the absolute value of the negative numbers and store them
in memory starting at 0B000 H. The original locations of these negative numbers should be
cleared.
3) What is the content of AX after the execution of each of the following segments? In all parts
assume AX is initialized to zero and DS=A000 H.
MOV BX, 3300H
XCHG AX, BX
MOV DH, 44H
MOV AL, 28H
ADD AL, DH
DAA
MOV BX, 3300H
MOV [3300H], 22H
MOV [3301H], 33H
XLAT
MOV AH, A2H
NEG AX
All programs should be documented.