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MBC2130 spurious resets - solution

This may help somebody. The MCB2130 board uses a couple of pins on the com0 interface to generate a reset or interrupt. I thought I was ok to leave these unconnected when using the serial port for other purposes. However, stray capacitance in the cable was causing crosstalk, making the board reset itself - but only above 9600 baud.

Grounding the unused pins (4 and 7) fixed the problem.

Maybe a board revison could add some resistors from the base of T1 and T2 to ground.

Dave

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