The Freedom Fighter prototype PIF board has a 680 ohm pull-up resistor on the E clock signal which was hand soldered on after the PCB was made. I wasn't sure what effect this would have, so I tested it with my scope. I tested with the resistor and installed and with it removed.
The short answer is that the pull-up resistor seems to strengthen the E signal without affecting the timing.
Without the resistor installed:
With the resistor installed: