8086 Assembly Language program for begiinner. set the video display mode. 

;---------------------------------------------------------------------
; SetDisplayMode:
;   I/P        :
;     1, Mode To Be set
;   Description:
;     Sets The Display Mode . Fill HorizontalRes & VerticalRes
;     With Appropriate Value
;---------------------------------------------------------------------
SetDisplayMode Macro Mode
  mov ah,00
  mov al,Mode
  int 10h
  mov ax,320
  mov HorizontalResolution,ax
  mov ax,200
  mov VerticalResolution,ax
  mov ax,0a000h
  mov VideoMemoryAddress,ax
endm