SCAN

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

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

DECLARE FUNCTION _
SCAN AS WORD () SHARED STATIC INLINE

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