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Question about four memory bits in MC68HC812A4

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shebo

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in MC68HC812A4, when applying memory mapping to extra window to the address $0000 which will interfere with 512 bytes register then by applying memory expansion to extra memory we have to use CS0, CS1, CS2, CS3 bits, my question is why we have to use them i already know we use them to distinguesh between four memories but why four, and is technique used in a specific industrial field ?
 

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