it possible to pause now and again without any loss of data. A serial link to a
printer can make use of hardware handshaking meaning that the hand-
shaking can be implemented by using electrical signals over another set of
lines,
but this option is not open to most communications applications
because extra telephone lines are not available for this use.
The handshaking is therefore implemented in software by using the
XON/XOFF system. This uses the ASCII code numbers 17 and 19, which
are not used for characters, sent between one computer and the other. Data
can be sent out from a computer following the ASCII 17 code, and disable ...
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