Friday, April 3, 2015

The mysterious 680 ohm resistor added to the Freedom Fighter PIF board's E clock

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:

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