Sun Microsystems Enterprise 250 Owner's Manual page 125

4 J2702, J2704, and J2804 are used to affect the operation of the flash PROM located
on the main logic board. For information about the flash PROM jumper settings,
see "About Flash PROM Jumpers" on page 93.
The illustration below shows the jumper locations on the main logic board.
Figure 5–10
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.
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Hardware Configuration