HRM 3450 Lecture Notes - Lecture 20: Computer Hardware, Application Software
5 May 2018
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HRM 3450 Tutorial 20 Notes – Distributed Processing Systems
Introduction
• Recall that in this example you are sitting at your computer typing text into a word
processor.
• We noted that the computer accepted input from your mouse and keyboard, processed
it according to rules established by the application software, and produced output,
which appeared on a display.
• From the system perspective, we can, for now, treat the whole computer, keyboard,
display, printer, storage, software, and all as a single component.
• You’re the relevat part of the eviroet for this discussio.
• Forgetting the issue of control for now, the system has an input and an output. Both of
these interface with you, the environment.
• The data for this interface is alphanumeric text in human-readable form.
• Other input data to the document might include graphics drawn with the mouse,
photographic images from a digital camera, bar codes, or music from an iPod or other
audio source.
• We described this scenario earlier, as input-process-output.
• A system this simple is unlikely to meet all the needs of even the smallest enterprise or,
even, the least computer-literate individual.
• But it does serve as a starting point to recognizing the value of a system approach to the
understanding of information technology.
• Realistically, modern IT system architectures generally rely on multiple computers
connected by networks of communication channels to achieve their goals.
• In all but the smallest organizations, input data is collected from locations scattered
throughout the organization, stored, processed, and distributed to other locations
within the organization.
• Since modern computer hardware and networking equipment is plentiful and
inexpensive, it is practical to distribute computing capability to everyone who needs it.
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