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Kind of an odd problem: I've been trying to get the MRF24j40ma to work with the Teensy and with the Arduino Mini with no success. The chip works fine with the larger Arduino boards, but the same configuration with the Teensy 2.0 or the Mini doesn't work. In the oscilliscope the CLK signal and MOSI signal look fine, but there's nothing on the MISO to indicate the MRF24j40ma is responding. Swapping boards with the same configuration works fine. The INT is always at a constant 3.3V, does that need a pull down resistor with these smaller boards by any chance? Any advice or ideas would be appreciated. Thanks!