program to convert ASCII to packed BCD numbers

Following program is for conversion of ASCII to packed BCD numbers

For execution of this program, we load the 1st ASCII digit into BL and the second ASCII number into the second AL. Then we mask the upper 4 bits of 1st digit and load CL for 4 rotate required. ROtate BL 4 bit position and combine nibbles, result in AL and finally we HALT the program.

CODE:

MOV BL,35H
MOV AL,39H
AND BL,0F
AND AL,0F
MOV CL,04
ROL BL,CL
OR AL,BL
INT A5

OUTPUT: 59 Packed BCD Number

Assembly program to convert BCD to ASCII

Assembly program to convert BCD to ASCII

Initially the input is moved in SI register , then its divided by 10 and then 30 is added to the number for both AH, AL i.e. the 8 bit higher and lower registers. Then the output is moved to the destination index register.

Following is the program code in assembly language to convert a BCD number to ASCII.

MOV SI,2000
MOV DI,4000
MOV AX,[SI]
MOV BL,10
DIV BL
MOV DL,30
ADD AL,DL
ADD AH,DL
MOV [DI],AX
INT A5

Example Input: 08 , Output: 30 38

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