ibcac
return ibcac(board, synchronous, 1);
ret = ibcac(board, 1, 1);
ret = ibcac(board, 1, 1);
ret = ibcac(board, 1, 1);
ret = ibcac(board, 1, 1);
retval = ibcac(board, 1, 1);
int ibcac(struct gpib_board *board, int sync, int fallback_to_async);