@Rich, Thanks for keeping me honest. I was pulling all those values for the V3 EZB from memory After reviewing the help section it looks like I got the port voltages right;

Peripheral Power
Each type of port (Digital/Analog/i2c) include +5 and GND pins. The +5 and GND are powered of the 5 Amp DC Regulator which are protected by the heatsinks. The power pins of the EZ-B can power small motors and servos. The heatsinks will get very hot when more power is used by the peripherals.

The Signal pin is connected to the EZ-B Microchip for reading or writing data from Digital or ADC. (my own voltage testing shows me it supplies 5vdc and it's been well documented that it will support next to nothing in current draw). 

From the online EZB manual:
The EZB requires a minimum of 5 volts DC. The ideal voltage is 7.2 volts. Consult the end of this document for maximum voltage specifications *Note: The higher the voltage, the hotter the regulators will get!

From the end of the above referred to document:
Input Voltage (min) - 5 Volts DC
Input Voltage (max) - 17 Volts DC
Input Voltage (recommended) - 7.2 Volts DC @ 3 Amps

From above it looks like I was right about V3's input voltage. I stated: Min 5vdc and max 17vdc. However thanks for helping me to keep it factual.

Here's a link to that online V3 & V 2.1 manual: synthiam.com/Manual/EZ-B%20Technical%20Manual.pdf

It's very true when you imply that V4's true specs are mostly a mystery to us till it ships and a manual is supplied. confused