Null Terminator

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If you bought a Dreamcast from China, you might notice there to be a piece of plastic where the modem would be. In fact, it connects to the parallel port, and has a blank pcb with no active components. This device likely acts as a safe 'null' terminator for the G2 expansion bus.

Note: The above is mostly conjecture. For more information and great pictures, please see the following thread:

The board has the following printed on it:

PC BD TERMINATION 171-7788A 839-1107A