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subsequently transmitted in block mode to a host com-
puter, these control bits are translated into escape
sequences which are transmitted along with the dis-
playable text characters (the same is true if the
E5C
XferOD configuration field is set to
"YES"
and you are
copying the content of display memory to an external
printer).
From the keyboard, you enable and disable the various
video enhancements using the"
e nha n c e video"
set of func-
tion keys. To get to that set, use the following keystroke
sequence:
II
..
enhance
video
This changes the function key labels to the following;
-
Ell
.. ..
define
modify
SET
SECUR lTV
field.
char .et
ENHNCMNT
VIDEO
.. .. .. -
INVERSE
BLINK
UNDRLINE
HALF
VIDEO
VIDEO
VIDEO
BRIGHT
To cause a particular string of text characters to be dis-
played using one or more of the enhancements, do as fol-
lows:
1.
Enable the desired enhancement(s) by pressing the as-
sociated function key ( . . , . . , . . , . . , and/or
a).
When an enhancement is enabled, an asterisk
appears in the associated key label.
2. Position the cursor at the first character in the string.
3. Press . . . The selected enhancements take effect
imm.ediately. You will notice that the enhancements
begin at the cursor position and continue through the
end of the line (or through the next subsequent column
in which another display enhancement begins). You will
also notice that when you press
"SET ENHNCMNT" ( . . ),
the asterisk automatically disappears from the selected
key labels (all enhancements are disabled until you
once again explicitly enable them).
4. Position the cursor at the column immediately to the
right of the final character in the string.
Display Control
5. Press . . . The enhancements disappear from the
cursor position through the end of the line (or through
the next subsequent column in which another display
enhancement begins). You have actually enabled "no
enhancements", which is recorded in display memory as
a distinct control bit pattern that will be translated into
an escape sequence
«ESC>&d@)
if the contents of dis-
play memory are transmitted to a host computer in
block mode.
From a program executing in a host computer, you enable
and disable the various video enhancements by embedding
escape sequences within the data. The general form of the
escape sequence is as follows:
<ESC) &d <enhancement code)
where enhancement code is an
@,
5,
or
S
or one of the
uppercase letters
A
through
0
specifying the desired
enhancement(s) as follows:
Half-Bright
Underline
Inverse Video
Blinking
End
Enhancement
@
A
x
x
B
C
D
x
x
x
x
Enhancement Character
E
F
G
H
I
J
x
x
x
x
x
x
x
x
x
x
x
x
-
K
L
M
N
0
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
To enable the security field enhancement, use the char-
acter
"5"
or
"S"
as an
<enhancement code).
For example,
consider the following escape sequences:
<ESC>&d5B
Enable both the security field and inverse
video display enhancements (and disable
any other existing enhancements at the cur-
rent cursor position).
<ESC)&dS
Enable the security field enhancement by
itself (and disable any other existing
enhancements at the current cursor po-
sition).
4-9
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