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Graphics
Graphics Data
4010 EMULATION. The terminal normally allows you to address 512 X 390 points; in
Compatibility Mode, the number of addressable points extends to 1024 X 780, emulating the
4010. Line length in normal operations is 24 lines by 80 characters; while in Compatibility
Mode, line length is 35 lines by 74 characters (see figure D-15). 4010-style graphics can be
drawn either scaled or unsealed. Scaling divides X and Y coordinates by 2, mapping the 1024 X
780 display into 512 by 390. This allows a program written for the 1024 X 780 terminal to run
unchanged, and still display the entire picture,with some loss in resolution (See figure D-i6).
Unsealed mode displays a 512 by 390 subset of the 1024
X
780 picture. The area this covers can
be changed by modifying the value of the relocatable origin (and redrawing the picture). The
relocatable origin is subtracted from all incoming coordinates in unsealed mode. If this is set to
0,0 (the default) the range
X
=
0 to 511,
Y
=
0
to 389 is displayed (see figure D-17a).
Setting the origin to 0,360 would cover the X
=
0 to 511, Y
=
360 to 749. To display an area
larger than 512
X
390, you must change the scaling statements in the program.
E(&5
1 pO
Q
I
Turn on scaled Compatibility Mode
A.) Turn on Compatibility Mode
Turn on unsealed
Compatibility Mode
No terminator
Send Break after page full
\
/
I
I \
E(&5
Op 1
Q
Et*
t
2a 1 c 1 B
\
I
Select page full busy
B.) Turn on Compatibility Mode and select straps
E[
&
5
0
P
0
Q
I
Turn off Compatibility Mode
C.) Turn off Compatibility Mode
Figure D-19. Turning On Compatibility Mode
D-48
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