AtoZ

include 'emu8086.inc'
.MODEL SMALL
.STACK 100H
.CODE

MAIN PROC

    MOV AH,1
    INT 21H
    MOV BH,AL

    CMP BH,'A'
    JL EXIT
    JGE J

    J:
    CMP BH,'Z'
    JG EXIT

    MOV AH,2
    MOV DL,0AH
    INT 21H
    MOV DL,0DH
    INT 21H

    MOV AH,2
    MOV DL,BH
    INT 21H

    EXIT:
    MOV AH,4CH
    INT 21H
    MAIN ENDP
END MAIN