format  void SCL_VblankStart (void)
 Input  None
 Output  None
 Function value  None
 Function  Starts VDP1 and 2 V-BLANK for display (scroll parameter set, etc.). 

  format  void SCL_VblankEnd (void)
 Input  None
 Output  None
 Function value  None
 Function  Performs VDP1 and 2 display V-BLANK termination processing (sprite frame change, etc.). 

  format  void SCL_AbortAutoVe (void)
 Input  None
 Output  None
 Function value  None
 Function  Automatic VE forced termination