Title MS-DOS Example                  (DOS1-4.ASM)

;Problem statement:
;Write a program that reads a series of ten lowercase
;letters from input (without displaying it), converts
;each character to uppercase, and then displays the
;converted character.

INCLUDE Irvine16.inc

COUNT = 10

.code
main proc
    mov ax,@data
    mov ds,ax

    mov  cx,COUNT  ; loop counter

L1: mov  ah,7      ; input character, no echo
    int  21h       ; AL = character
    sub  al,20h    ; convert to upper case
    mov  ah,2      ; character output function
    mov  dl,al     ; character must be in DL
    int  21h       ; display the character
    Loop L1        ; repeat loop

	exit
main endp

end main