8086 Assembly Language Game Programming. Check if two rectangles have collided
Note  : You need the collisiondetectionproc proceure. Its there in this website. 

;---------------------------------------------------------------------
;CollusionDetection Macro:
;   Description:
;       Checks For Collusion Detection (Rectangular)
;---------------------------------------------------------------------
CollusionDetection macro Obj1L,Obj1T,Obj1R,Obj1B,Obj2L,Obj2T,Obj2R,Obj2B 
  push ax
  mov ax,Obj1L
  mov Object1Left,ax
  mov ax,Obj1T
  mov Object1Top,ax
  mov ax,Obj1R
  mov Object1Right,ax
  mov ax,Obj1B
  mov Object1Bottom,ax
  mov ax,Obj2L
  mov Object2Left,ax
  mov ax,Obj2T
  mov Object2Top,ax
  mov ax,Obj2R
  mov Object2Right,ax
  mov ax,Obj2B
  mov Object2Bottom,ax
  call CollusionDetectionProc
  pop ax
endm