Graphics
Graphics Data
4010
EMULATION.
The
terminal
normally allows you to address 512 X 390 points;
in
Compatibility Mode,
the
number
ofaddressable 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. Scalingdivides X
and
Y coordinatesby 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 subsetof
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 incomingcoordinates
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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