Write a short assembly language program for the following task. Write a program

Question

Write a short assembly language program for the following task. Write a program to convert the contents of a block of RAM into "ASCII hex" and leave the results in another block of RAM. Upon startup, the starting address of the block to be converted is located at address $8000, the starting address of the result block is located at address $8002 and the number of bytes to convert is located at address $8004 (one byte). Your program should include a subroutine to do the conversion of each nibble into its corresponding ASCII code. Note: in order to convert a byte into ASCII hex, you must separate the 8-bit byte into two 4-bit nibbles and then use. the ASCII chart to convert the nibble into an ASCII character

Explanation / Answer

    ; i've used the concept of pointers ..tomove to nxt loc increment it    mov cx,[8004] ; count          mov si,[8000] ;starting addr -data          mov di,[8002] ;statring addr -result again: mov ax,[si] ; moves 1st data into acc         mov bx,ax ; stores acopy into b-reg         and ax,#0fh ; masks upper         call sr ;   callssubroutine        mov [di],ax ; storesresult         inc di ; moves to next resultloc        mov bx,ax       swap ax ; swaps the upper andlower        and ax,#0fh        call sr        mov [di],ax       inc di         inc si ; moves to nextdata loc         loop again ; loop executescount times       end ; end of program sr :   cmp ax,#0ah          jl thr ; jumps thr if it's no          add ax,#37h          sjmp en thr : add ax,#0ah ; to get the original no         add ax,#30h en :    ret           ; instructions may change depending on the controller orprocessor ; the logic remains the same

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