assembly - how to print char on the screen -


i try make '#' left side of screen , other side '$' it's not stop on 25*40

.model tiny  .code  .startup    cld   mov ax, 0b800h ;for open screen   mov es, ax       mov di, 0   mov cx, 25*40  ;try divide screen    mov ax, 5c23h   rep stosw    mov ax, 0b800h   mov ds, ax   mov si,0     mov cx, 25*40   mov ax, 6f24h   rep stosw  .exit end 

.model tiny  .code .startup    cld   mov ax, 0b800h ;for open screen   mov es, ax   xor di, di     ; di = 0   mov dx, 25     ; lines counter line_loop:   mov cx, 40   mov ax, 5c23h   rep stosw   mov cx, 40   mov ax, 6f24h   rep stosw   dec dx   jnz line_loop  .exit end

for fun , exercise power of xor you, shorter variant of code (try step on in debugger or head , understand how works):

  ...   xor di, di     ; di = 0   mov dx, 50     ; 50 half-lines fill   mov ax, 5c23h  ; start '#' half_line_loop:   mov cx, 40   rep stosw   xor ax, 3307h  ; 5c23 xor 3307 = 6f24, 6f24 xor 3307 = 5c23   dec dx   jnz half_line_loop   ...

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