Mono/Dual Case; Undefined Character Substitution; Print Text Direction - IBM 6400 Setup Manual

Alternate Set 80 – 9F
This selection determines if ASCII codes 80 hex through 9F hex will be used
as control codes or printed as standard printable characters.
Printable (the default) prints the alternate set as standard characters
Control Code selects the alternate set to be used as printer control codes.

Mono/Dual Case

MONO/DUAL CASE specifies the font as MONO Case or DUAL Case (the
default). It is available only in non-SCS mode. The host will be notified of
the change when the printer is made READY. If the character set is one of
the following 'right to left' sets, MONO CASE prints the same as DUAL
CASE: Katakana, Hebrew, Hebrew Old, and Farsi.
SCS (System Network Architecture Character String) Mode is controlled by
the host computer. Refer to the 6400 Coax/Twinax Programmer's Reference
Manual for more information about non-SCS mode.

Undefined Character Substitution

UNDEFINED CHARACTER SUBSTITUTION specifies the replacement
character to print in place of any unprintable character that is received from
the host.
The character code point can range from hex 40 to hex FE. The factory
default is set to hex 60.

Print Text Direction

PRINT TEXT DIRECTION specifies the direction in which characters are
printed on the page. This allows the printer to print languages which are
printed right to left instead of left to right.
CONTROL BY HOST (the default)
LEFT TO RIGHT
RIGHT TO LEFT
The "CONTROL BY HOST" option allows printers configured as a 4234 to
use the "SET TEXT ORIENTATION" command from the host.
When a RIGHT TO LEFT language is selected, the host will be notified of
print direction changes when the printer is made READY.
4–34 6400 Line Matrix Printers Setup Guide, Cabinet and Pedestal Models