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What is the valid range for signed 8-bit integers represented in 2's complement ...

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What is the valid range for signed 8-bit integers represented in 2's complement notation on the STC89C52?

-128 to +127, because the MSB represents the sign and the remaining 7 bits represent magnitude

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0 to 255, treating all 8 bits as unsigned magnitude

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-127 to +127, with symmetric positive and negative ranges

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-255 to +255, using all bits for extended range

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