Exercise in clearing the screen and choosing the desired background color.

 .model small
.code
org 100h
mov ax,0600h
mov cx,0000h
mov dx,0c28h
mov bh,40h
int 10h
mov ax,0600h
mov cx,0028h
mov dx,0c50h
mov bh,10h
int 10h
mov ax,0600h
mov cx,0d00h
mov dx,1928h
mov bh,30h
int 10h
mov ax,0600h
mov cx,0d28h
mov dx,1950h
mov bh,20h
int 10h
mov ax,0600h
mov cx,040eh
mov dx,0c42h
mov bh,50h
int 10h
mov ax,0600h
mov cx,0d0eh
mov dx,1442h
mov bh,60h
int 10h
mov ax,0600h
mov cx,081bh
mov dx,1028h
mov bh,70h
int 10h
mov ax,0600h
mov cx,0828h
mov dx,1035h
mov bh,00h
int 10h
mov ah,02h
mov dx,0000h
mov bh,01h
int 10h
int 20h

/*Screen Shot*/