IBM 3151 Manual To Operations page 73

Keyboard Functions
KEY
Hold Screen
Home
Insert
. Insert
Insert Line
II
~
FUNCTION
Stops the screen from being updated by the host system during normal
operation. The incoming data will be stored in the display station. If
the display station's data buffer becomes almost full, an XOFF
character will be sent to the host system. .
Pressing this key again starts the screen update operation.
Moves the cursor to the home position (first unprotected character
position) of the active page.
Places the keyboard in insert mode and allows characters to be
inserted in a field when
MODE
is selected, or inserts a space character
when
SPACE
is selected for the Insert Character option. Pressing this
key again or pressing the Reset key exits insert mode.
If there is no space to insert a character (when the Forcing Insert
option is OFF) or the cursor is in a protected field, the audible alarm
sounds and
WRONG PLACE
appears at the bottom of the screen.
Inserts a null line where the cursor is located. If there is no space to
insert a line (when the Forcing Insert option is OFF), or the cursor is
in a protected field, or an attribute character exists in the current line,
the audible alarm sounds and
WRONG PLACE
appears at the bottom of
the screen.
3-10
IBM 3J51 Guide to Operations