Statement: Write an assembly language program to convert the contents of the five memory locations starting from 2000H into an ASCII character. Place the result in another five memory locations starting from 2200H.

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Sample Problem

       (2000H) = 1

       (2001H) = 2

       (2002H) = 9

       (2003H) = A

       (2004H) = B

       Result:(2200H) = 31

               (2201H) = 32

               (2202H) = 39

               (2203H) = 41

               (2204H) = 42

Source program:

       LXI SP, 27FFH        : Initialize stack pointer

       LXI H, 2000H        : Source memory pointer

       LXI D, 2200H        : Destination memory pointer

       MVI C, O5H                : Initialize the counter

BACK: MOV A, M                : Get the number

       CALL ASCII                : Call subroutine ASCII

       STAX D                : Store result

       INX H                        : Increment source memory pointer

       INX D                        : Increment destination memory pointer

       DCR C                : Decrement count by 1        

       CJNZ                        : if not zero, repeat

       HLT                        : Stop program execution subroutine ASCII

ASCII: CPI, OAH                : Check if number is OAR

       JNC NEXT                : If yes go to next otherwise continue

       ADI 30H

       JMP LAST

NEXT: ADI 37H

LAST: RET                        : Return to main program

Subroutine:

Subroutine 'ASCII' converts a hexadecimal digit to ASCII.The digit is passed using accumulator and the result is stored in accumulator.Stack starts From 27FEH to 27FDH.

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FLOWCHART

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Note: The ASCII Code (American Standard Code for Information Interchange) is commonly used for communication. In such cases we need to convert binary number to its ASCII equivalent. It is a seven bit code. In this code number 0 through 9 are represented as 30 through 39 respectively and letters A through Z are represented as 41H through 5AH. Therefore, by adding 30H we can convert number into its ASCII equivalent and by adding 37H we can convert letter to its ASCII equivalent.