IBM 3164 ASCII Manual page 147

Chapter 5. Programming considerations
5-60
After POR, the characters on the screen are displayed in the default character (
attributes of:
• Non -blinking
• Non-highlighting
• Non - reverse
• Non - underline
• Green characters on a black background.
The above characteristics remain effective until it is changed by the Set
Character Attribute (SCA) command. from the host or the keyboard.
The character attributes specified from the host remain effective for characters
input from the keyboard or sent from the host while the character attributes
specified from the keyboard work only on characters input from the keyboard.
When a Set Character Attribute command is specified from the keyboard, only
characters input from the keyboard use the keyboard character attribute while
characters sent from the host use the host character attribute. To reset this
state, you must specify the Reset Character Attribute (RCA) command from
the host or keyboard.
When the Reset Character Attribute command is specified from the host or the
keyboard, characters input from the keyboard are displayed in the character
attribute currently effective at that character position
The diagram below shows how the character attributes will be changed by the
SCA and RCA commands for characters input from the keyboard.
The CA changes to
the CA specified
from the keyboard.
The CA changes to
the CA specified
from the host.
¢DDDDDDDDDDDD
/1
~
SCA specified
from the host
¢o
SCA specified
from the keyboard
. . . RCA specified
from the host or
keyboard.
The current CA
rema ins in effect.