I got the test system working again. The culprit for all my problems was the system's PSU. It's reporting 4.6V for the +5V, and the +5V also goes to the MAX6655. I connected the Maxim reader to a psu that outputs more reasonable voltages and all is now well. The system behaving like it had a short and the repeated clicking of the hdd make more sense now too. Anyway I hopefully can keep making progress with testing and have some good stuff for you guys this week.
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Getting paid like a biker with the best crank...
-MF DOOM
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