; how to use cmpsw instruction to compare word strings. 

name "cmpsw"

org     100h

; set forward direction: 
        cld

; load source into ds:si, 
; load target into es:di: 
        mov     ax, cs
        mov     ds, ax
        mov     es, ax
        lea     si, dat1
        lea     di, dat2

; set counter to data length in words: 
        mov     cx, size

; compare until equal: 
        repe    cmpsw
        jnz     not_equal

; "yes" - equal! 
        mov     al, 'y'
        mov     ah, 0eh
        int     10h

        jmp     exit_here

not_equal:

; "no" - not equal! 
        mov     al, 'n'
        mov     ah, 0eh
        int     10h

exit_here:

	; wait for any key press: 
	mov ah, 0
	int 16h

        ret

; data vectors must have equal lengths: 
x1:
dat1 dw 1234h, 5678h, 9012h, 3456h
dat2 dw 1234h, 5678h, 9012h, 3456h
size = ($ - x1) / 4