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RAM and ROM address differentiation in 8051.

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teslagrc

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Hello everyone,
Address bus of 8051 is 16 bit wide which can address 64kB of memory, and some manufacturers provide a 64kB of ROM and 1792B of RAM. With only 16 bit address bus how is it possible to access 64kB of ROM+ some amount of RAM.
Please correct if I am wrong.
Thank you.
 

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