title MS-DOS Function Calls - 2      (DOS2-1.ASM)

;Problem statement:
;Write a program that inputs a string using DOS
;function 0Ah. Limit the input to ten characters.
;Redisplay the string backwards

INCLUDE Irvine16.inc

.data
COUNT = 11
keyboardArea label byte
maxkeys    db  COUNT
charsInput db  ?
buffer     db  COUNT dup(0)

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

    mov  ah,0Ah    ; buffered keyboard input
    mov  dx,offset keyboardArea
    int  21h
    call Crlf

; Redisplay the string backwards, using SI
; as an index into the string

    mov  ah,0
    mov  al,charsInput  ; get character count
    mov  cx,ax          ; put in loop counter
    mov  si,ax          ; point past end of string
    dec  si             ; back up one position

L1: mov  dl,buffer[si]  ; get char from buffer
    mov  ah,2           ; MS-DOS char output function
    int  21h
    dec  si             ; back up in buffer
    Loop L1             ; loop through the string

    call Crlf

	exit
main endp

end main