AT&T 6300 Programmer's Manual page 493

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For the form:

VIEW SCREEN (x1,y1)-(x2,y2)

all coordinates are absolute and may be inside

or outside of the screen limits, but only those

within the VIEW limits will be

VIEW SCREEN (10,10)-(200,100)

were executed, then the point set down by the

statement PSET(0,0),3 would actually not

appear because 0,0 is outside of the viewport.

PSET(10,10),3 is within the viewport, and

places the point in the upper-left hand corner

of the viewport.

VIEW with no arguments defines the entire

viewing surface as the viewport. This is

equivalent to VIEW (0,0)-(319,199) in medium

resolution, VIEW (0,0)-(639,199) in high

resolution, and VIEW (0,0)-(639,399) in super

Multiple viewports can be defined, but only

one viewport (called the "current viewport")

may be active at anyone time. Each time a

VIEW statement is executed a viewport is

defined and this is the current viewport. Thus,

to change the current viewport, you have to

execute another VIEW statement.

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