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The expansion rom base register indicates the size of the expansion rom by the number of bits that remain zero after code attempts to set them all to 1. For example, a result of fffe0000 means 128K. The 11 least significant bits are ignored in the size calculation, which means the minimum rom size is indicated by fffff800 = 2K. Handle the case where an expansion rom file might not have a size that is a multiple of 2 or is not greater than 2K. Bytes between the end of the file and the end of the calculated rom size are set to 0xff.