IBM 3708 Planning And Installation page 169

All addresses must contain a function number, but function numbers need not be
unique; two or more sequences can perform the same function. For example, any of
the entries that correspond to undefined characters should contain the function
number for the BEL function (X' 33'), causing the terminal to beep when the key is
pressed.
Special Considerations for the Keyboard Mapping Definition Section
Special considerations for the keyboard mapping definition section are:
• For ANSI-compatible terminals, an ESC sequence often has a left bracket
character inserted after the ESC character. This character should be ignored
when defining the terminal table. The 370S accounts for the possibility of
receiving the left bracket based on the setting of the ANSI flag in terminal table
byte 2.
• If the terminal generates a trailing character (for example, a carriage return) in
the ESC sequence, add X' SO' to the function number and delete the carriage
return from the key sequence. For example, the 3101 generates ESC H CR
when its PFS key is pressed. To use the 3101 function PFS for the 3270 function
PFS, you must add X' SO' to the PFS function number X' 07' , resulting in
X'S7'.
• Whatever is specified as a function number for ESC is ignored. Also, if an
alternate control sequence character is defined, the function number for this
character, or ESC plus this character, is ignored.
• Control code X' 7F' is not definable in the keyboard map definition section.
This value is hardcoded in the 370S and always represents the Delete function.
Other keystrokes may be defined to perform Delete but any key that transmits
X' 7F' always performs the Delete function.
15-12
3708
Planning
and
Installation