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Display size commands Dl, D2, and D3 set the display size for CRT graphics. BEX is a fourth display size that can
only be accessed by a display control instruction: graph, label, or vector mode. 256 (big expand) must be added to
the control word, i.e., graph (1024 + 256). Once a code is selected, it remains in effect until changed.
Positions on the CRT display are referenced in display units as x, some horizontal position, and y, some vertical
position. The coordinates (x,y) represent distance from the lower left-hand corner of the graticule (O,O), which is
also the origin. The upper right-hand corner is the (1000, 1000) point.
S I Z E
AA
D 2
A
D3
A
bex
AA
B
l
(689,689)
Display size 4 cannot be accessed by the command code D4
*No writing outside boundary marked by AA, D
D2
B
-
C
C
D
(785,978)
(1005,957)
(690,658)
(676,645)
(671,671)
(686,686)
D 1
Display Size Normal
Display Size Full CRT
D3
Display Size Expand
T BEZEL
R
E
(500,500)
(562,515)
(379,347)
(336,336)
P r o g r a m m i n g 8 3
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