Preface 
This guide 
is 
written for persons who will be operating the 
IBM 
3278 Display Station attached 
to 
a 3274 Control Unit 
or 
to 
a 3276 Coptrol Unit Display Station. 
If 
your 3278 
Display Station is attached to a control unit 
or 
to 
an adapter 
other than a 3274 or a 3276, some operations and/or indica-
tors may be different from those described in this guide. 
The operator should refer to the appropriate appendix for a 
description 
of 
these differences. 
For 
information about the operation 
of 
the 3274 Control 
Unit, the 3276 Control Unit Display Station, the 3287 
Printer, and the 3289 Line Printer, refer 
to 
the following 
pUblications: 
• 
IBM 
3270 Information 
Display 
System:  3274 Control 
Unit 
Operator's 
Guide, 
GA23-0023 
• 
IBM 
3270 Information 
Display 
System:  3276 Control 
Unit 
Display 
Station 
Operator's 
Guide, 
GA18-2040 
• 
IBM 
3287 Printer 
Operator's 
Guide, 
GA27-3150 
• 
IBM 
3289 Line Printer 
Operator's 
Guide, 
GA27-3147 
For information about the setup 
of 
the 3274 
ModellC, 
3276,3278,3287, 
and 3289, refer 
to 
the following 
documents: 
• 
IBM 
3270 Information 
Display 
System:  3274 
Control 
Unit 
Planning, 
Setup, and Customizing 
Guide, 
GA27-2827 
• 
IBM 
3270 Information 
Display 
System:  3276 Control 
Unit 
Display 
Station 
Planning 
and Setup 
Guide, 
GAl 8·2041 
• 
IBM 
3274 Control 
Unit 
ModellC 
Setup Instructions, 
GA27·2855 
• 
IBM 
3276 Control 
Unit 
Display 
Station Setup Instructions, 
GA18·2017 
• 
IBM 
3278 
Display 
Station Setup Instructions, GA27-2838 
• 
IBM 
3287 Printer Setup Instructions,  GA27·3152 
• 
IBM 
3289 Line Printer Setup Instructions,  GA27-3140 
The keyboards illustrated in this manual are U.S. and 
Canadian French keyboards. 
For 
information concerning 
other keyboard languages, refer 
to 
IBM 
3270 Information 
Display 
System: 
Character 
Set Reference, GA27-2837. 
While 
IBM 
makes available many basic functions, the user 
chooses those he will utilize and in what manner. 
It 
is the 
responsibility 
of 
the user 
to 
establish and maintain appropriate 
operating procedures for the equipment. 
Some 
of 
the units, devices, options, and features described 
in 
this manual may 
not 
be available in every locale.  Ask your 
local 
IBM 
marketing representative for information about 
product availability. 
Preface 
iii