chapter 2
the computer
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Understanding Computer Systems: Input, Output, and Interaction, Slides of Human Resource Management
The various elements of a computer system, focusing on input and output devices, memory, processing, and physical interaction. It also discusses the importance of understanding human-computer interaction and the evolution from batch processing to interactive computing. Devices covered include keyboards, mice, screens, virtual reality, paper, and sensors.
Typology: Slides
2012/2013
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chapter 2
the computer
The Computer
a computer system is made up of various elements
each of these elements affects the interaction
- input devices – text entry and pointing
- output devices – screen (small&large), digital paper
- virtual reality – special interaction and display devices
- physical interaction – e.g. sound, haptic, bio-sensing
- paper – as output (print) and input (scan)
- memory – RAM & permanent media, capacity & access
- processing – speed of processing, networks
A ‘typical’ computer system
- screen, or monitor, on which there are windows
- keyboard
- mouse/trackpad
- variations
- desktop
- laptop
- PDA
the devices dictate the styles of interaction that the system supports If we use different devices, then the interface will support a different style of interaction
window 1
window 2
12-37pm
How many …
- computers in your house?
- hands up, …
… none, 1, 2 , 3, more!!
- computers in your pockets?
are you thinking … … PC, laptop, PDA ??
Interactivity?
Long ago in a galaxy far away … batch processing
- punched card stacks or large data files prepared
- long wait ….
- line printer output … and if it is not right …
Now most computing is interactive
- rapid feedback
- the user in control (most of the time)
- doing rather than thinking …
Is faster always better?
Richer interaction
sensors
and devices
everywhere
Keyboards
- Most common text input device
- Allows rapid entry of text by experienced
users
- Keypress closes connection, causing a
character code to be sent
- Usually connected by cable, but can be