Here is how I hooked up the SparkFun FTDI (USB to TTL) Adapter in place of the Bluetooth module that sits on top of the EZ-B.
1. I very carefully removed the Bluetooth module from the EZ-B by using a small flat blade screw driver to pry it up. The double sided tape eventually let loose from the IC Chip and I pulled the module free from the EZ-B header .
2. I used the male jumpers that I got from the EZ Robot Store to hook up the FTDI header to the EZ-B header.
VCC to VCC <- EDIT: Found out this connection is not needed.
GND to GND
Tx to Tx
Rx to Rx
(Yes that's right Tx to Tx and Rx to Rx. I thought it should be Tx to Rx and Rx to Tx but that did not work.)
3. I hooked the SparkFun Mini-B cable from the FTDI board to the ASUS Mini ITX motherboard.
4. I powered up the EZ-B using a battery pack and then powered up the ASUS Mini ITX motherboard.
5. Windows 7 Home Edition (64 Bit) informed me that it could not find a driver so I let it search the internet.
6. It eventually found, loaded and installed a "FT232 USB UART" diver and assigned it to COM 7.
7. I started EZ-Builder, chose COM 7 and clicked on Connect. The EZ-B blue LED went from blinking to solid blue and all looked good. I hooked a servo to D0 and tested its operation with good results.
Notice anything interesting in the picture above?..... When I unhooked the battery pack from the EZ-B the EZ-B remained on. It was being powered from the Mini ITX. Connection was not lost. The blue LED remained on. However, I found that the servo would not work anymore until I hooked the EZ-B battery pack back up.
<- EDIT: Found out the VCC to VCC connection is not needed.
I have now removed the VCC connection between the EZ-B and the FTDI.