Oh, yeah, don't leave the reset pin floating.

The usual thing to do with these is to tie them to +5 through a resistor (say 10k), and also to ground through a capacitor - 5nF should give you a 50-100 ms reset pulse when power is turned on.
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Toby Speight
030103016 (80GB Mk2a, blue)
030102806 (0GB Mk2a, blue)