Ensamblador - circulo

alguien puede mandarme el codigo en el 8086 para dibujar un circulo porfavor?, la verdad es que me urge demasiado, espero sus respuestas.

.model small
.stack 100h
.data
ybeg dw 90
xbeg dw 90
xend dw 90h
y dw 96h
x dw 92h
x1 dw 130h
y1 dw 100h
xc dw 90
yc dw 90
rad dw 90
pc dw 0
vaux1 dw 1
vincx dw 0
vincy dw 0
vaux2 dw 0
;bandera dw 0

.code

mov ah,0 ;peticion para designar el modo
mov al,12h ;modo grafico 320x200 256c
int 10h

push ds
mov ax,@data
mov ds,ax
call circulo
salir:
mov ah,0 ;espera que se pulse una tecla
int 16h
pop ds
mov ah,0 ;regresa al modo 80x25
mov al,2
int 10h
mov ah,4ch ;regresa al so
int 21h

circulo proc near
mov ax,@data
mov ds,ax
mov ax,xc
xor ax,ax
mov xc,ax
mov ax,1
sbb rad,ax ;pc=rad-1
mov ax,rad
mov pc,ax
jmp short a226
a58:
mov bx,pc
or bx,bx
jl short a114 ;if pc>0
inc xc ;xc++
mov ax,xc
jmp short a142
a114:
inc xc
dec yc
mov ax,xc
sub ax,yc
a142:
shl ax,1 ;2*xc+1
inc ax
sub pc,ax
call pxp

a226:
mov ax,xc
cmp ax,yc ;while(xc<yc)
jl short a58
ret
pxp proc near
mov ax,x1 ;mov cx,x
add ax,xc ;mov dx,y
mov cx,ax
mov ax,y1
add ax,yc
mov dx,ax
call pixel
mov ax,x1 ;mov cx,x
sub ax,xc ;mov dx,y
mov cx,ax
mov ax,y1
add ax,yc
mov dx,ax
call pixel
mov ax,x1 ;mov cx,x
add ax,xc ;mov dx,y
mov cx,ax
mov ax,y1
sub ax,yc
mov dx,ax
call pixel
mov ax,x1 ;mov cx,x
sub ax,xc ;mov dx,y
mov cx,ax
mov ax,y1
sub ax,yc
mov dx,ax
call pixel
mov ax,x1 ;mov cx,x
add ax,yc ;mov dx,y
mov cx,ax
mov ax,y1
add ax,xc
mov dx,ax
call pixel
mov ax,x1 ;mov cx,x
sub ax,yc ;mov dx,y
mov cx,ax
mov ax,y1
add ax,xc
mov dx,ax
call pixel
mov ax,x1 ;mov cx,x
add ax,yc ;mov dx,y
mov cx,ax
mov ax,y1
sub ax,xc
mov dx,ax
call pixel
mov ax,x1 ;mov cx,x
sub ax,yc ;mov dx,y
mov cx,ax
mov ax,y1
sub ax,xc
mov dx,ax
call pixel

ret
pxp endp
circulo endp


pixel proc near
mov ah,12
mov al,10 ;color
mov bh,0 ;Pagina
int 10h
ret
pixel endp
end