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# Ch2 - Chapter 2 2.1 Bits and Data Types o 2.1.1 The Bit as...

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Chapter 2 2.1: Bits and Data Types o 2.1.1: The Bit as the Unit of Information We represent the presence of voltage as “1”, and the absence as “0”. Each 0 and 1 is a bit, which is a shortened form of binary digit. The electronic circuits in the computer differentiate voltages close to 0 from voltages far from 0, not by absolute presence If the computer expects a voltage of 2.9 volts or a voltage of 0 volts, then a voltage of 2.6 will be taken as a 1 and 0.2 will be taken as a 0. To identify uniquely many things, it is necessary to combine multiple bits. o 2.1.2: Data Types There are many ways to represent the same value A particular representation is a data type if there are operations in the computer that can operate on information that is encoded in that representation Each ISA has its own set of data types and its own set of instructions that can operate on those data types.

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