Dear all, When I prepared for the presentation, I have overlooked the end of the correct output (refer to ossim.out) LOGON U001 HR: 0 MN: 0 SC: 0 MS: 0 mS: 0 NS: 0 SIO U000 HR: 0 MN: 0 SC: 0 MS: 0 mS:150 NS: 0 SIO U000 HR: 0 MN: 0 SC: 0 MS: 0 mS:950 NS: 0 WIO U000 HR: 0 MN: 0 SC: 0 MS: 1 mS:950 NS: 0 WIO U000 HR: 0 MN: 0 SC: 0 MS: 1 mS:950 NS: 0 END U000 HR: 0 MN: 0 SC: 0 MS: 1 mS:990 NS: 0 "You can get correct output without implementing the Cpu()." is incorrect. If the Cpu() is not implemented, you will get only one event ouput: LOGON U001 HR: 0 MN: 0 SC: 0 MS: 0 mS: 0 NS: 0 Please go on to finish the Cpu(). You can refer to the the powerpoint http://www.cs.ucf.edu/courses/cop4600/fall2005/misc/obj2hao.ppt I am sorry for my mistake. TA: Hao Cheng. 2005-11-06