====== SCAN ======

[vic20] [c64] [c16] [cplus4] [c128] [x16] [m65]

The ''SCAN()'' function tells which scan line is currently draw on the screen.

===== Function declaration =====

  DECLARE FUNCTION _
  SCAN AS WORD () SHARED STATIC INLINE

===== Example =====

  ' A simple raster effect
  SYSTEM INTERRUPT OFF
  start:
  DO : LOOP WHILE SCAN() < 160
  BORDER 3
  DO : LOOP WHILE SCAN() > 10
  BORDER 0
  GOTO start