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Key Sequences for Non-3270 Functions
The following functions are available by entering key sequences, but are not normal
3270 functions. These functions are provided by the 3708 to make data entry at
your terminal easier, to enable you to use the auxiliary port of your terminal for
printing, and to allow you to control the display of the status line.
Null/Blank:
The Null/Blank function either sets or resets (toggles) enhanced
null/blank processing mode. When the mode is active,
NIB
appears on the status
line.
Enhanced Null/Blank mode allows you to use either the space bar or the cursor
movement keys to edit and separate fields. When you enter data, the 3708 converts
imbedded nulls (nulls between two characters in a field) to blanks.
When in null/blank mode, the Insert function operates differently. Either trailing
nulls or trailing blanks can be pushed off the end of the field when in insert mode.
This saves you from having to explicitly delete trailing blanks in order to insert
characters.
Type-ahead:
The Type-ahead function either sets or resets (toggles) Type-ahead
mode. When the mode is active, TYP appears on the status line.
Type-ahead mode allows you to queue several characters for processing. You can
continue to enter key sequences (data or AID characters) while a previous sequence
is being processed. For example, if you wanted to page forward five times in a file
editing program without using type-ahead, you would have to enter the appropriate
PF key sequence once, wait for the screen to be updated with the next page of data,
then repeat this process four more times.
Using type-ahead, you press the PF key five times without waiting for the screen
update to occur between each. Once the 3708 has received the screen update from
the host for the first PF key and has processed it, but before the 3708 begins
updating your screen, the next PF key is sent to the host. Depending on the
response time from your host, this may result in a partial screen update occurring,
and then being overlaid by a subsequent screen, or intermediate screens may not be
displayed at all.
Sialus On/Off:
The Status On/Off function is used to display the 3708 status line.
You can turn the status line on or off at almost any time. If the keyboard is locked,
enter the Status On/Off sequence to see the status line. See "How the 3708 Updates
the Status Line" on page 4-37 for details about the 3708 status line emulation.
The Status On/Off function cannot be used if your terminal uses the last line for
status.
Chapter 4. Protocol Conversion Mode
4-51
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