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Display Control
You use the first five enhancements on a field basis. They may be used separately or in any
combination. When used, they cause control bits to be set within the workspace. If the content
of the workspace is subsequently transmitted in Block mode to a host computer, these control
bits are translated into escape sequences which are transmitted along with the displayable
text characters (the same is true if the
EscXfer(N)
configuration field is set to
YES
and you
are copying the content of a workspace to an external printer). The inverse background
enhancement, on the other hand, is entirely a local function in that it affects the appearance
of the display screen, but does not set any control bits - in -the workspace.
From the keyboard, you enable and disable the various video enhancements using the func-
tion keys (except for inverse background, which is enabled and disabled on the Global Config-
uration menu). To do so you must first enable the video enhancement keys as follows:
III,
enhance video.
To cause a particular string of text characters to be displayed using one or more of the
enhancements, do as follows:
1. Enable the desired enhancement(s) by pressing the associated function key. When an
enhancement is enabled, an asterisk appears in the associated key display.
2. Position the cursor at the first character in the string.
3. Press
SET ENHNCMHT.
The selected enhancements take effect immediately. You will notice
that the enhancements begin at the cursor position and continue either through the right
boundary of the workspace, through the rightmost character on the line, to a character set
change, or to the next column in which another display enhancement begins. Also notice
that when you press
SET EHHHCMNT,
the asterisks automatically disappear from the func-
tion key display (all enhancements are disabled until you once again enable them).
4. Position the cursor at the column immediately to the right of the final character in the
string.
5. Press the
SET ENHHCMHT
key. The enhancements disappear from the cursor position either
through the right boundary of the workspace, through the rightmost character on the line,
to a character set change, or to the next column in which another display enhancement
begins. You have actually enabled
tt
no enhancements" which is recorded in the workspace
as a control bit pattern that will be translated into an escape sequence
(Ec&d)
if the
content of the workspace is tranmitted 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:
Ec&d
<enhancement code>
where enhancement code is an
8,
5,
or
S,
or one of the uppercase letters
A
through
0
specifying
the desired enhancement(s) as follows:
4-23
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