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convert an uppercase letter to lowercase with Intel 8085

Discussion in 'Assembly Language Programming (ALP) Forum' started by panayiotispatra, Nov 25, 2008.

  1. panayiotispatra

    panayiotispatra New Member

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    Can somebody help με το change the following program that is written in 8086 in 8085
    I want to convert an uppercase letter to lowercase with Intel 8085

    org 100h
    jmp start
    new_line db 0Dh,0Ah, '$' ; new line code.
    start:
    lea dx, string
    mov ah, 0ah
    int 21h
    mov bx, dx
    mov ah, 0
    mov al, ds:[bx+1]
    add bx, ax ; point to end of string.
    mov byte ptr [bx+2], '$' ; put dollar to the end.
    lea dx, new_line
    mov ah, 09h
    int 21h
    lea bx, string
    mov ch, 0
    mov cl, [bx+1] ; get string size.
    jcxz null ; is string is empty?
    add bx, 2 ; skip control chars.
    upper_case:
    ; check if it's a lower case letter:
    cmp byte ptr [bx], 'a'
    jb ok
    cmp byte ptr [bx], 'z'
    ja ok
    and byte ptr [bx], 11011111b
    ok:
    inc bx ; next char.
    loop upper_case
    lea dx, string+2
    mov ah, 09h
    int 21h
    ; wait for any key press....
    mov ah, 0
    int 16h
    null:
    ret
     

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