Output Devices.
Output Devices
1) HARD COPY DEVICES – PRINTERS
2) SOFT DEVICES - VIDEO DISPLAY DEVICES
HARD COPY DEVICES
Printers used when there is large volume of data and several copies are normally needed Types of printers
PRINTER CHARACTERSTICS
LINE PRINTERS
-Large volume output
-fast entire line printed
-multiple copies
-high capital cost but low running cost
DOT MATRIX PRINTERS
- Slow
- inexpensive ( per copy cost)
- multiple copies with carbon paper
- poor graphics
INKJET PRINTERS
- Characters + graphics
- multicolour
- capital cost low compared to laser printer
- recurring cost high
LASER PRINTERS
-Characters + graphics
-multicolour expensive
-excellent quality
-capital cost high
- recurring cost lower than inkjet
SOFT COPY MEDIA
Used to distribute manuals, massive reports, user documents, etc
• FLOPPY DISK
- Inexpensive
- Easy to mail/transport
- Low capacity –1.4MB
- Read/write
• CDROM
- Inexpensive Medium
- Read only cheaper/safer
- High capacity – 600MB
- Easy to transport/mail
- Primarily used for Text/Graphics
• DVDROM
- Read only cheaper/safer
- Very high capacity – upto 8GB
- Easy to transport
- Useful for storing high quality video such as full length movies
• FLASH MEMORY
- Read/Write
- Small size and weight
- No moving parts thus very reliable
- Needs USB port on PC
- Size 128KB to 2GB
- Low Power needs
- Expensive
SPEECH OUTPUT DEVICES
• Audio such as beeps used for alerting users
• Device used is a speaker
- Very small and inexpensive for beeps
- Inexpensive for poor speech quality
• Useful when eyes are busy, for example, while driving, pilots etc.
• Pre-recorded speech is output in such cases
• Text-to-speech also useful for giving instructions where manuals cannot be read.
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