Lexmark TN3270E 用户手册

This SCS Options > COR/APO Settings option controls the text 
mode used in the APO/COR function. In the APO/COR function, the 
print quality parameter is used (text mode on/off) to disable/enable 
computer output reduction mode. 

To print in computer output reduction mode, the print quality must be 
set to Data Processing (Text mode off). If "Letter Quality" or "Draft" 
(Text mode on) is selected, the computer output reduction mode will 
be disabled and the print job will be printed in Portrait orientation 
(Text mode). 

As it will not always be possible to control the print quality of the jobs 
printed from the host, this option is used to disable text mode. When 
text mode is disabled, the APO/COR function will ignore the print 
quality parameter and print all print jobs fulfilling the requirements in 
computer output reduction mode. Refer to