HRM 3450 Lecture Notes - Lecture 4: Mainframe Computer, Vector Processor, Usability
5 May 2018
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HRM 3450 Tutorial 4 Notes – Computer Speed
Introduction
• Toda’s sstes, suh as Widows XP ad Vista, Liu, ad Maitosh OS X, oie
much more power on one hand with improved user friendliness and ease of use on the
other.
• There are several reasons
• There has been a great increase in computer speed and power.
• More powerful integrated circuits have allowed the design of faster computers using
faster clocks and larger internal data paths, together with techniques for speeding up
instruction execution.
• Even small personal computers can support tens of megabytes of memory and many
gigabytes of disk storage.
• A modern PC may contain as much as one thousand times the memory and execute
instructions one thousand times as fast as the 1965 IBM OS/360 mainframe computer.
• Thus, more capability can be built into the operating system without sacrificing
performance.
• There have been fundamental improvements in computer hardware design.
• Many modern computers are designed as an integrated unit, hardware and operating
system software together.
• Most computer hardware contains special features intended to support a powerful
operating system.
• Such features as special graphics, cache memory, and vector processing and virtual
storage memory management hardware are intended primarily for use by the operating
system.
• These features used to be available only on large mainframes.
• A protected mode of hardware instructions, accessible only to the operating system,
provides security and protection to the operating system and allows the operating
sste to protet the sste’s resoures ad users.
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