GE CM6 Hardware Reference Manual page 79

Configuration jumpers J1900, J1901, J1902
GE Intelligent Platforms – CM6 Hardware Reference Manual, Fourth Edition
Software Configuration Jumper J1900
If the software configuration jumper J1900 is closed the software can execute
other boot code. Please refer to the programming manual for exact operation.
Write Protect Jumper J1901
If the Write Protect jumper J1901 is closed all write commands to the Flash and
nvSRAM/RTC devices are disabled.
Flash Kill Option J1902
For security reasons the flash devices can be destroyed with this optional
feature. If the Flash Kill jumper (J1902) is closed and the option is available at
the CM6 this will destroy the flash devices.
PMCIO connector P7101
P7101 a 64 pin header contains PMCIO signals:
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