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What is the maximum directly addressable memory capacity of 32 bit microprocessor?

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Assuming your memory card slot(s) permit, 2 to the power of 32 = 4294967296

which is apprx 4 GB
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What is the maximum memory address space that the processor can access directly if it is connected to a 16 bit memory considering a hypothetical microprocessor generating a 16-bit address?

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What is the maximum memory capacity that can be connected to a microprocessor data bus with 16 lines and the address bus has 20 lines?

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What is the maximum addressable memory capacity?

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