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Understanding the Machine, the first volume in the landmark Write Great Code series by Randall Hyde, explains the underlying mechanics of how a computer works.Like the highly regarded first edition, this second edition of Understanding the Machine covers machine organization and computer science topics like the CPU, machine architecture, memory and cache organization, I/O and peripheral devices, and how the decoding and execution of machine instructions affects software performance. This edition has been updated to cover 64-bit machines, newer peripheral devices, larger memory systems, large-scale SSDs, and newer CPUs like those used in personal computers and tablets.