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10 bytes removed ,  4 June 2019
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Boards are two to six layers.
Boards are two to six layers.


The CPU board has battery backed up RAM to save the current configuration and one user config.  This battery is a potassium hydroxide electrolyte cell.  It will eventually fail and leak, damaging the PCB.  The battery is visible on the picture for the A09 processor board.
The CPU board has battery backed up RAM to save the current configuration and one user configuration.  This battery is a lithium iodide cell.  It will eventually fail and leak, damaging the PCB.  The battery is visible on the picture for the A09 processor board.


==Links==
==Links==
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