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keyboard and mouse

By santoshjdevadiga ·
dear all,
can u pls reason why when a keyb is removed and reconnected it works without rebooting the pc but not the same with ps/2 mouse.

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keyboard and mouse

by Joseph Moore In reply to keyboard and mouse

There is also OS concerns to keep in mind. The more modern operating systems can recover if you unplug the mouse (Win2K/XP can, but NT4 cannot). I would think that Win98 possibly could, but I know that Win95 cannot. The more modern operating systemscan keep the drivers for the mouse in memory without getting confused. The older operating systems get confused when you unplug the mouse.
As for the keyboard, the other comments are right on this. Keyboards are maintained on a system level, not really from the OS. That is why you can unplug a keyboard, plug it back in, then press the Caps Lock button to "refresh" the keyboard and get it to work again.
But for the mouse if you want to do this, upgrade to the most recent operating systems. They can do this too (and it is a nice feature!).

hope this helps

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keyboard and mouse

by santoshjdevadiga In reply to keyboard and mouse

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keyboard and mouse

by maxwell edison In reply to keyboard and mouse

The way I understand it is this. The difference has to do with the method and speed with which the data is transmitted. A simplistic way of looking at it is this: The data to and from a mouse is transmitted (almost) immediately, while the data transmission for the keyboard is more or less a “send and wait” signal. If the data transmission is interrupted, the device fails. That’s why the mouse would fail and the keyboard would continue to work. Subsequently, the interfaces for each are designed accordingly. The keyboard/system protocol is different than the mouse/system protocol.

See these links for some very detailed information (if you’re interested.)

PS/2 KEYBOARD & MOUSE PROTOCOLS: Auxiliary Device and System Timings:

http://www.networktechinc.com/ps2-prots.html

Keyboard to system protocol and System to keyboard protocol:

http://members.tripod.com/~ilkerf/c64tower/F_Keyboard_FAQ.html#KEYBOARDFAQ_007

(REMOVE SPACES from the pasted URLs.)

Maxwell

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keyboard and mouse

by maxwell edison In reply to keyboard and mouse

By the way, I would not suggest swapping a keyboard while the computer is on. An errant spark could damage the keyboard and/or motherboard.

Maxwell

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keyboard and mouse

by santoshjdevadiga In reply to keyboard and mouse

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keyboard and mouse

by santoshjdevadiga In reply to keyboard and mouse

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