[Blind-sysadmins] Serial port header block on mobo

I'm about to have a new PC built. So far, I have always been able to find a motherboard with a serial port header block. Does anybody know what incantation I can use while searching for a mobo with the serial header block? Searching for mobos with com1 has not worked. What is the technical name for that serial port on the mobo? -- John .G. Heim jheim@math.wisc.edu