(joystick) - .
.
(trackball) - , .
(trackpoint) - , .
.
(tonchpad) - , .
- .
(. 3.15) , .
(), .
, .
.
.
.
, .
.
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, .
.
dpi (dot per inch), .
200 dpi 1200 dpi .
, . 24 , 8 .
30 36 .
. .
, :
- ,
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- ,
- .
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OCR (Optical Character Recognition) .
3.3.4.