assembly - x86 Strange printing after console has been scrolled -


i have following function:

printrows proc     mov cx, 25     printrowsloop:           mov si, 0         printsinglerowloop:              mov ah, 3  ;save current cursor position  @ dx (dh:dl)             int 10h              push dx ;keep position later              mov ah, 2             mov dl, '&'                int 21h      ; print '&' char in current curser position              pop dx   ; restore dx              add dl, 5 ; increase column of const number (so square)             mov ah, 2             int 10h              inc si             cmp si, 3 ; print 3 '&' in each row             jne printsinglerowloop           mov dl, 13     ; result of these 3 groups of commands should 2 new lines         mov ah, 2         int 21h          mov dl, 10         ;mov ah, 2 ; ah alredy 2         int 21h          ;mov dl, 10 ; dl 10         ;mov ah,2  ; ah 2         int 21h          loop printrowsloop  ; print (cx) lines      ret  printrows endp

the output of should seen in this screenshot - , output of (at least in begginig)

but, after "good" output filled console (when needed "scroll") doesn't longer print spaces between each '&', instead prints each of them in new line as can seen here.

what might cause such strange behaviour? doing wrong? how should fix this?

i using emu8086.

you should print carriage return (13 ascii code) last.

i have included fifoernik's tips in answer.

printrows proc mov cx, 25 printrowsloop:       mov si, 0     printsinglerowloop:          push cx         mov bh, 0         mov ah, 3  ;save current cursor position  @ dx (dh:dl)         int 10h           pop cx           push dx ;keep position later          mov ah, 2         mov dl, '&'            int 21h      ; print '&' char in current curser position          pop dx   ; restore dx          mov bh, 0         add dl, 5 ; increase column of const number (so square)         mov ah, 2         int 10h          inc si         cmp si, 3 ; print 3 '&' in each row         jne printsinglerowloop            mov dl, 10         ;mov ah, 2 ; ah alredy 2         int 21h          ;mov dl, 10 ; dl 10         ;mov ah,2  ; ah 2         int 21h          mov dl, 13    ; <<<<<<<<<<<<<<<<<<<<< print carriage return last!         ;mov ah, 2 ; ah 2          int 21h        loop printrowsloop  ; print (cx) lines  ret  printrows endp

no need space character:)


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