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【正文】 on = another less popular representation Figure Two’ s plement notation systems Figure Coding the value 6 in two’ s plement notation using four bits Figure Addition problems converted to two’ s plement notation Figure An excess eight conversion table Figure An excess notation system using bit patterns of length three Figure Floatingpoint notation ponents Figure Coding the value 25?8 Figure The ASCII codes for the letters A and F adjusted for odd parity Figure An errorcorrecting code Figure Decoding the pattern 010100 using the code in Figure 謝謝觀看 /歡迎下載 BY FAITH I MEAN A VISION OF GOOD ONE CHERISHES AND THE ENTHUSIASM THAT PUSHES ONE TO SEEK ITS FULFILLMENT REGARDLESS OF OBSTACLES. BY FAITH I BY FAITH 。 Megabyte = 220 = 1,048,576 ? “ Giga” normally means 1,000,000,000。 ? 1993, Pentium EDSAC –1949 劍橋大學(xué) 真空管為元件的電腦 APPLE II IBM puter ? 1981 Chapter 1 Data Storage Chapter 1: Data Storage ? Bits and Their Storage ? Main Memory ? Mass Storage ? Representing Information as Bit Patterns ? The Binary System ? Storing Integers Chapter 1: Data Storage (continued) ? Storing Fractions ? Data Compression ? Communications Errors Bits and their meaning ? Bit = Binary Digit = a symbol whose meaning depends on the application at hand. ? Some possible meanings for a single bit ? Numeric value (1 or 0) ? Boolean value (true or false) ? Voltage (high or low) Bit patterns ? All data stored in a puter are represented by patterns of bits: ? Numbers ? Text characters ? Images ? Sound ? Anything else… Boolean operations ? Boolean operation = any operation that manipulates one or more true/false values ? Can be used to operate on bits ? Specific operations ? AND ? OR ? XOR ? NOT Figure The Boolean operations AND, OR, and XOR (exclusive or) Gates ? Gates = devices that produce the outputs of Boolean operations when given the operations’ input values ? Often implemented as electronic circuits ? Provide the building
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