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K Service Source Power Macintosh 7100 Series Power Macintosh 7100/66, 7100/66AV, 7100/80, 7100/80AV K Service Source Basics Power Macintosh 7100 Series Basics Power Macintosh System Overview - 1 Power Macintosh System Overview PowerPC microprocessors are a family of processors built on reduced instruction-set computing (RISC) technology. RISC processors streamline the internal workings of computers. Whereas traditional (complex instruction-set computing, or CISC) processors contain a wide variety of instructions to handle many different tasks, RISC processors contain only those instructions that are used most often. When a complex instruction is needed, a RISC processor builds it from a combination of basic instructions. RISC processors are designed to execute these basic instructions extremely quickly. The performance gains achieved by speeding up the most-used instructions more than compensate for the time spent creating less-used instructions. Basics Power Macintosh System Overview - 2 Previously, RISC technology had been used only in high-end workstations and commercial database servers. With the introduction of Macintosh PowerPC computers, Apple succeeded in bringing RISC technology to personal computing. Key Points Three key points to remember about a PowerPC processor- based Macintosh system: It's a Macintosh; it's compatible; it offers tremendous performance. Apple's PowerPC computers feature the same user interface as their 680x0-based predecessors. Users can mix RISC- based and 680x0-based Macintosh systems on the same net- work and exchange files and disks between them. In addition, users can run both 680x0 and native PowerPC applications on the same Power Macintosh system simultaneously. Basics Power Macintosh System Overview - 3 Compatibility is not limited just to applications. INITs, CDEVs, drivers, and other Macintosh utility software also work on PowerPC processor-based Macintosh systems. So do AppleTalk devices (such as printers), SCSI devices (such as hard drives and scanners), ADB devices (such as mice, trackballs, and keyboards), and other Macintosh cards and peripherals. The primary operating system for PowerPC processor- based Macintosh computers is System 7. The operating system has been optimized for the highest performance on the PowerPC processor. This optimization of System 7 benefits applications written for 680x0 systems as well as those developed specifically for PowerPC processor-based