Computer Basics. Samples of Operating Systems IBSYS (IBM 7090) OS/360 (IBM 360) TSS/360 (360 mod 67) Michigan Terminal System CP/CMS & VM 370 MULTICS.

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Presentation transcript:

Computer Basics

Samples of Operating Systems IBSYS (IBM 7090) OS/360 (IBM 360) TSS/360 (360 mod 67) Michigan Terminal System CP/CMS & VM 370 MULTICS (GE 645) Alto (Xerox PARC) Pilot (Xerox STAR) CP/M IRIX Solaris MVS VxWorks MACH Apollo DOMAIN Unix (System V & BSD) Apple Mac (v. 1– v. 9) MS-DOS Windows NT, 2000, XP Novell Netware Linux FreeBSD PalmOS PocketPC VxWorks

Samples of Operating Systems (continue…)

Memory CPU Registers Bank Monitor Printer Modem Main Memory ALU Secondary Memory Tertiary Memory Control Unit Keyboard Mouse Scanner Modem Input Unit Output Unit Cache Memory Computer ROMRAM HDFDCDFlash Tape

Components of a simple personal computer Hard drive controller Video controller Memory USB controller Network controller Outside world CPU Computer internals (inside the “box”)

Access latency 1 ns 2–5 ns 50 ns 5 ms 50 sec < 1 KB 1 MB 1 GB 200 GB > 1 TB Capacity Storage pyramid Registers Cache (SRAM) Main memory (DRAM) Magnetic disk Magnetic tape Goal: really large memory with very low latency Latencies are smaller at the top of the hierarchy Capacities are larger at the bottom of the hierarchy Solution: move data between levels to create illusion of large memory with low latency Better

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