Returns an I/O request for use with timer calls.

Item GetVBLIOReq (void)

GetVBLIOReq() creates and returns an I/O request that is suitable for use with the WaitVBL() and WaitVBLDefer() calls.

This call returns the item number of the I/O request or an error code (a negative value) if an error occurs.

Convenience call implemented in graphics.lib V20.

graphics.h, graphics.lib

WaitVBL(), WaitVBLDefer(), DeleteItem()