Note that those rise and fall times are affected by your probe capacitance as well (although your measurements do give some baseline; as in the 'raw' unconnected rise/fall times are always going to be faster than this) I've taken another measurement after calibrating my scope and changing to 10x at...

Have you been able to measure those rise/fall times? I could use some figures. I've only got a 70 MHz oscilloscope. I am new to this and this is my first post, but using a simple test of digitalWrite-ing a pin between HIGH and LOW I am seeing rise/fall times of roughly 45-50ns on the scope. I also ...