ok people i got this dallas 12887 thing beat, here it is. pins 2,3,16,20,21,22 are missing right. so 21 would have been clear real time clock. aka clear cmos on a motherboard. take a hacksaw an cut into the side of the dallas 12887 right in the middle of where the missing pins 20,21,22 are stop when you hit metal. take a jumper wire and short to ground. {mine was clear after i reinstalled it cause the hacksaw must have touched another pin} bago wango tango cleared the cmos. dave