Sun Microsystems Enterprise 250 Owner's Manual page 81

Jumpers are marked on the main logic board with identification numbers.
For example, the serial port jumpers are marked J2604 and J2605. Jumper pins are
located immediately adjacent to the identification number. Pin 1 is marked with an
asterisk (*) in any of the positions shown below.
J X X X X
*
*
*
Part number
Pins
Asterisk indicates Pin 1
*
*
*
Chapter 4 Hardware Configuration 63