What is Background Debug Mode, and why do I want it?

BDM stands for `Background Debug Mode', and it is a special debug interface on some of Motorola's embedded 68K and Power PC processors. BDM allows an external debug system to control and monitor the operation of the embedded processor through a 10-pin proprietary serial interface, without any software support in the target system and without the use of an In-Circuit Emulator (ICE). 

Using a low-cost interface cable to your PC's printer port, and the right software on your PC, you can perform most of your debugging directly on your target hardware at very low cost.

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