IBM 3164 ASCII Manual page 156

Using the Cursor Address and Buffer Address commands
There are two addressing modes for the 3164. The cursor address :s specified
by the Cursor Address (CA) command. The buffer address is specitied by the
Buffer Address (BA) command.
The cursor address allows a character entered from the keyboard or received
. from the host to be stored at the cursor position on the display. After the
display terminal is powered-on, the cursor address and the buffer address is at
the same position; the top of the screen. The current buffer address (CBA) is
set initially to the current cursdr address (CCA) until the Set Buffer Address
(SBA) or the Extended Set Buffer Address (XSBA) command is received from
the host. Once the display station enters the buffer address mode, data
received from the host is handled by the BA. The host can send a character
and display it without changing the cursor position, if the display is controlled
by the buffer address. The character received is stored at the specified buffer
address. The buffer address increases its value by 1 upon receipt of the
character. The cursor address is not used and does not change. The display
station remains in BA mode until the following command is received.
Cursor Move (Up, Down, Right, Left, or Home) command
Insert Cursor (IC) command
Reset Buffer Address Mode command
Set Cursor Address (SCA) command
Extended Set Cursor Address (XSCA) command
However the last BA remains unchanged.
During the keyboard operation, the CCA is always used, regardless of the
buffer address maintained by the host.
To locate a desired cursor address or buffer address, refer to the Cursor and
Buffer Address Table on page 5-80.
5-69