Moving back and forth strings in assembly -

given matrix 25 rows , 80 columns attributes 160 columns have write program in assembly move 4 letter string "fool" (say) move across matrix , forth.

what have done till now:

mov bx,0b800h mov ds, bx mov si, 1760  mov cx,80 fool: add si,-6 mov [si], " " add si, 2 mov [si], "f" add si, 2 mov [si], "o" add si, 2 mov [si], "o" add si,2 mov [si],"l" loop fool  mov cx, 80 foool: add si,-6  mov [si], "f" add si, -2 mov [si], "o" add si, 2 mov [si], "o" add si,2 mov [si],"l" add si,2  mov [si], " " loop foool  mov ah,9 int 21h 

but code, when reversed, last letter comes before first. newbie in assembly, have tried 8085 before first attempt 8086.

i grateful if me fix problem.

this works:

; compile nasm: ; nasm.exe fool.asm -f bin -o fool.com bits 16 org 100h  mov bx,0b800h mov ds, bx mov si, 80*11*2 ; 1760  mov cx, 80+1-5 fool: mov [si], byte " " add si, 2 mov [si], byte "f" add si, 2 mov [si], byte "o" add si, 2 mov [si], byte "o" add si, 2 mov [si], byte "l" sub si, 3*2 call delay loop fool  sub si, 1*2  mov cx, 80+1-5 foool: mov [si], byte "f" add si, 2 mov [si], byte "o" add si, 2 mov [si], byte "o" add si, 2 mov [si], byte "l" add si, 2  mov [si], byte " " sub si, 5*2 call delay loop foool  mov ax, 4c00h int 21h  delay: pusha push ds  mov ax, 0 mov ds, ax mov bx, [46ch]  d0: mov ax, [46ch] cmp ax, bx je d0 ; wait timer tick (once in ~55 ms)  pop ds popa ret