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8. (18 points) Assume a certain system has an 8-bit address bus. After the system is powered on, a) Fill in the table below to show the block address of each byte aumuso wierence. (2 points) b) Assume the cache is a direct-mapped cache as shown below. Fill in the table below to show the outcome or each address reference. Assume the cache is empty at the beginning. Note each data block has 4 bytes. ( 4 points)