{Unfortunately not able to paste into the forum} Feb 23, 2009 M1 Firmware (4.5.14 and 5.1.14) Note: 14 Added ability to power the M1 Board from a 16 to 18 VDC power supply in lieu of an AC Transformer. NOT AVAILABLE FOR M1EZ8! On the M1, simply connect 16-18 VDC to AC input terminals, no polarity need be observed. The DC voltage MUST be a minimum of 16 Volts in order for switching power supply to work properly. This capability was added as a result of some areas of the world outlawing AC transformers due to their inefficiency.
I suspect the version of M1 board will need to be Rev M to support this feature. The Rev of M1 board can be found in the upper left hand corner right above Zn1