Sun Microsystems Fire V890 Service Manual page 273

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Note – Jumper J3003 is factory-set so that the flash PROM is write-enabled. You use
the keyswitch located on the front panel to write-protect the flash PROM. When the
switch is set to the Locked position, the flash PROM is write-protected. When the
switch is set to the Normal position or to the Diagnostics position, the flash PROM is
write-enabled.
Chapter 7 Hardware Configuration
245

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