I've built myself an arduino-based PS2 keyboard -> USB keyboard converter (that also switches some keys around). I'm ironing out the last few kinks. I've got a SparkFun Pro-Micro (ATmega 32U4@5v+16MHz) wired directly to the PS2's Data&Clock pins with the sole source of power being the host computer …

Is PC USB power subject to dips and spikes?

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