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Bit 3-Scroll
If this bit is set to 1, the terminal shifts the entire screen of data up one line
when a character is sent to the last column of the last line on the screen.
For this case, the 3708 never sends a character for display in the last
character position on the screen.
If this bit is set to 0, the 3708 sends characters for display in the last
character position on the screen.
Bit 4-Extended Key Sequences
If this bit is set to 1, the extended tenninal table function is required for this
terminal.
It
is required for terminals that can send more than 3 characters
per keystroke.
It
is supported for the IBM 3151, IBM 3161, IBM 3162,
IBM 3163, IBM 3164, VT220, and FALCO 500. Refer to"Modifying
Extended Function Keys" for more information.
Bit 5-Field Attribute Byte
Terminals support two types of attribute processing to determine field
characteristics: character attributes and field attributes. A terminal with
character attributes remembers the current attribute setting, like
highlighting, until it is changed. Character attributes do not occupy a screen
character position. To support character attributes, bit 5 should be set to O.
Field attributes occupy a screen position much like 3270 displays. Unlike
character attributes, field attributes are remembered and need to be rewritten
only when they change. Whenever a field changes, the cursor must be
positioned at the attribute position to change or eliminate it. To support
field attributes, bit 5 should be set to 1.
If this bit is set to 1, the terminal being used reserves a position on the
screen display every time a field attribute sequence is transmitted by the
3708. Of the default terminal tables, the WY-50® is the only one that
operates in this manner. If this bit is 0, the terminal does not reserve a
position of the screen for field attributes.
Bit 6-Exc1ude 3708 Initialization
If
this bit is set to 1, the 3708 does not send the 3708 default terminal
initialization sequence provided for the terminal type. This bit is used along
with the user-defined terminal initialization sequence (see "Customization
Section") to determine what should be sent to initialize the terminal.
If this bit is set to 0, the 3708 sends its default terminal initialization
sequence provided for the terminal type, if one is defined. Refer to IBM
3708 Network Conversion Unit Description for a description of the 3708
default initialization sequences.
Bit 7-Reserved
This bit is not used, and it should be set to O.
Bit 8-Terminal Table Type
If this bit is set to 1, the table is an enhanced table (452 bytes long). If this
bit is 0, the table is a standard table (300 bytes long).
If
you attempt to set
this bit to 1 when standard tables are in use, or to 0 when enhanced tables
are in use, the control terminal does not accept the change.
Chapter 15. User-Defined Terminal Tables
15-7
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