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Q. Interfacing of keyboards?
The keyboard employs a special Input/output port which is similar to a serial port however doesn't explicitly follow the RS-232 serial port standard. In place of multiple data and handshaking signals as in RS-232 the keyboard employs just two signals by which it manages a bi-directional interface with its own set of commands.
Employing its elaborate handshaking mechanism keyboard and PC transmit commands and data to each other. USB keyboards work in a different way by using USB coding and protocol.
what is mean by refersing screen
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The desired level of coupling is:- Data coupling
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Don't scan at more resolution than needed. This saves both Disk and time Space. Typically itisn't useful to scan at more than optical resolution because it adds no new informa
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