Im new to assembler.
Im trying to do an “Space Invaders” game, but encountered a problem.

Every time I print the main spaceship and the enemies, I erase the hole screen, and then print again in the next position, for it not to be too fast, added a delay function, but it began blinking.

I read somewhere that you can solve that by chaging the page you print while you are printing, and then change again, but I dont understand the concept well.

Print Function: (names are in spanish because its my mother tongue)

imprimeEnemigo proc 

push cx

mov al, 219
mov cx, 1               
call imprime
add dl, 1
mov al, 220 
mov cx, 1 
call imprime
add dl, 1
mov al, 219 
mov cx, 1 
call imprime
add dl, 1
mov al, 220 
mov cx, 1 
call imprime
add dl, 1
mov al, 219 
mov cx, 1 
call imprime
sub dh, 1
mov al, 220 
mov cx, 1 
call imprime
sub dl, 1
mov al, 219 
mov cx, 1 
call imprime
sub dl, 1
mov al, 220 
mov cx, 1 
call imprime
sub dl, 1
mov al, 219 
mov cx, 1 
call imprime
sub dl, 1
mov al, 220 
mov cx, 1 
call imprime
add dh, 2
add dl, 1
mov al, 223 
mov cx, 1 
call imprime
add dl, 2
mov al, 223 
mov cx, 1 
call imprime
pop cx
  ret

imprimeEnemigo endp <—-This is for printing enemies

imprime proc

mov bh, 0   ;BH = Page Number
mov ah, 02h ;Set cursor position, con los parametros de dh y dl
int 10h

mov ah, 09h ;Write character and attribute at cursor position
int 10h

ret
imprime endp    <---- Main print function with coursor positioning and printing (used also for the score and some other things)

This is how I clear my screen after each cycle:

mov ah, 0Fh
int 10h
mov ah, 0
int 10h

And this is how I print the main character

imprime_Jugador proc

mov al, 219    
mov cx, 1      
call imprime
sub dl, 1
mov al, 220 
mov cx, 1
call imprime
add dl, 2
mov al, 220 
mov cx, 1
call imprime

    ret

imprime_Jugador endp

This is the delay function:

retardo proc
push ax
push bx
xor ax, ax
xor bx, bx

mov ax, cx

ret2:
dec ax
jz finDec
mov bx, cx
ret1:
dec bx
jnz ret1
jmp ret2

finDec:
pop bx
pop ax
ret

retardo endp

This is how the game looks like: https://i.sstatic.net/QMpkgGnZ.png

I tried many things, but didnt solve the problem at all, some reduced the blinking, but i want it to move smoothly through the screen