OPERATION
9 /
Routing Input/Output
Model
III lets you route I/O from one device to
another. This gives your programs
more versatility.
For example, suppose
you
have
a
program that outputs to the
Video Display. Now
suppose you want all display output
to go to
the printer. You can
accomplish this
without changing the program
at
all
,
using the route capability.
The source
device
(in our example,
the
display) will then be
logically equivalent to
the destination
device
(printer) until you
re-initialize
the I/O
drivers with SINITIO
(described later).
Here are the devices that
may
be routed:
Device
System
Abbreviation
Keyboard KI
Display DO
Printer PR
Send RO
Receive RI
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