Difference between revisions of "Universal Serial Bus (USB)"
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*Legacy serial ports on computers were slow speed and specific to a particular function, like: keyboard, mouse, audio in, audio out, serial RS232 port or printer port. | *Legacy serial ports on computers were slow speed and specific to a particular function, like: keyboard, mouse, audio in, audio out, serial RS232 port or printer port. | ||
*Now when a device is connected to a computer is must identify itself so that the computer can recognize that device and ensure it has the correct device driver installed. | *Now when a device is connected to a computer is must identify itself so that the computer can recognize that device and ensure it has the correct device driver installed. | ||
| − | *The smart card had a similar serial port with similar functionality. Since there were multiple card types, the | + | *The smart card had a similar serial port with similar functionality. Since there were multiple card types, the card will "Answer to Reset (ATR)" with a code identifying it.<ref>eft lab, ''Smart Cards - Answer To Reset (ATR).'' https://www.eftlab.co.uk/index.php/site-map/our-articles/169-demystifying-atr-answer-to-reset</ref> |
*New devices for [[User]] [[Identifier]]s and [[Attribute]]s are supplied with USB devices so that they can use the common port. | *New devices for [[User]] [[Identifier]]s and [[Attribute]]s are supplied with USB devices so that they can use the common port. | ||
Revision as of 10:30, 8 August 2018
Full Title or Meme
Nearly all computers and other portable devices support a single Universal Serial Bus (USB) for both data and power.
Context
- Legacy serial ports on computers were slow speed and specific to a particular function, like: keyboard, mouse, audio in, audio out, serial RS232 port or printer port.
- Now when a device is connected to a computer is must identify itself so that the computer can recognize that device and ensure it has the correct device driver installed.
- The smart card had a similar serial port with similar functionality. Since there were multiple card types, the card will "Answer to Reset (ATR)" with a code identifying it.[1]
- New devices for User Identifiers and Attributes are supplied with USB devices so that they can use the common port.
