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Log data is stored in the RAM chip located at position U10. If you have no chip there, you cannot store logs (contact Creative Control Concepts for pricing info on RAM chips)
However, if you have a RAM chip in U10 you may notice that you can't store as many logs as you think OR, you may notice that the logs get overwritten too soon.
On the HCS2-DX boards, we've found a discrepency. Older boards had JP6 labeled incorrectly. Newer boards were corrected, though they still show Rev 1.0
Anyway, the proper setting for JP6 is to have both jumpers installed on the TOP 4 pins so that pin 1 is left unconnected to anything. on older boards, this is labeled as the ROM position even though it is, in fact the RAM setting.
So regardless of what your JP6 label is, your jumpers should always be installed on the top 4 pins with pin 1 left unconnected. This ensure the proper connection of the A14 address line.
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Home Automation FAQ : 
New 100uf capacitor (C9), how do I tell which lead is the positive lead, there are no marking on it