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This section deals with output hardware devices.
A users main interaction with a PC is via a device that enters data into a computer (input device), or displays that data as information (output device).
By the end of this page you will be able to:
Visual Display Unit (VDU)
A device usually used for output to display the current status of programs and data files, but can be modified to accept light-pen input or touch.
Connection to the PC's motherboard is via Graphics adaptor. This may be either integrated into the motherboard or as a separate circuit Board installed in one of the PC's expansion slots.
- Standard Display Adapters ;
- MDA Monochrome Display Adapter (80 x 24 characters), usually Green, Amber or White.
- Hercules Mono - 720 x 348 pixels
- CGA Colour Graphics Adapter 16 Colours - 640 x 200 pixels
- EGA Enhanced Graphics Adapter 16 Colours - 640 x 350 pixels
- VGA Video Graphics Array 256 Colours - 640 x 480 pixels
- sVGA Video Graphics Array 256 Colours - 800 x 600 pixels
- XGA eXtended Graphics Array - 1024 x 1024 pixels
- Other (Video cards now allow for higher pixel densities to enable accurate display on large monitors).
- Eg. 1280 x 1280 , and beyond.
- Colour depth
- 8 bit = 256 colours
- 24 bit (True colour) = 16 million (16,777,216)
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A device that converts discrete numbers from a computer (digital) to physical measurements (analogue) to that are then relayed to device to perform or manage a process.
Process control system examples