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+v0.018
+------
+
+second prototype
+
+major fixes:
+- add bus switch instead of common power rail for pull-up resistors
+- replace MAX232 RS-232 transceiver with 3.3V capable and enable pin alternative
+- add diodes on xV voltage regulator output to prevent voltage regulator to sink current
+- add transistor to disable completely 12V voltages regulator, allowing it to got to 0V instead of 5V)
+
+v0.001
+------
+
+first prototype