AT&T 6300 Programmer's Manual page 509

WINDOW
Statement
In the physical coordinate system, if you run
the following:
NEW
or
SCREEN 2
the screen will appear with standard
coordinates as:
0,0
I
I
I
\Y
320,0 639,0
y
increases
320,100
0,199 320,199 639,199
If a window command is issued with SCREEN
omitted, the screen is viewed in the
CARTESIAN coordinates.
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