AT&T 6300 Programmer's Manual page 495

Example 1
VIEW
Statement
This example opens three viewports, each
smaller than the previous one. In each case, a
line that is defined to go beyond the borders is
programmed, but appears only within the
viewport border.
260 CLS
280 VIEW: REM
* *
Make the viewport the entire
screen.
320 VIEW (10,10] - (300,180],,1
330 LINE (0,0] - (310,190],1
360 LOCATE 1,11: PRINT uA big viewport"
380 VIEW SCREEN (50,50]-(250,150],,1
400 CLS:REM
* *
Note, CLS clears only viewport
420 LINE (300,0]-(0,199],1
440 LOCATE 9,9: PRINT UA medium viewport"
460 VIEW SCREEN (80,80]-(200,125]"1
480 CLS
500 CIRCLE (150,100],20,1
520 LOCATE 11,9: PRINT uA small viewport"
This example demonstrates scaling with
VIEW and WINDOW.
7-339