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m28256 vs m28c256 - datasheets needed

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CHESS

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m28256 and m28c256

what is the difference between them?
i found only the datasheet of m28256
 

The "C" was added on later chips to denote CMOS technolgy; however, the 28256 is also CMOS. Functionally, the 28C256 and the 28256 are the same.

The "M" is a manufacturer's ID code - it doesn't mean anything when it comes to the chip function. Below are data sheets for two other manufactures' version of the 28C256.
 

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