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Field Engineering
Theory Of Operation
Restricted Distribution
Th is manual is intended for internal use only and may not be
used by other than IBM personnel without IBM's written permissioh.
2260 Display Station, Models 1 and 2
2B4B Display Control, Models I, 2, and 3
(Serial No. SO,OOO Series)
Y27-2046-3
PREFACE
This manual presents the detailed theory of opera- This is a reprint of Y27 -2046-2 incorporating
tion of the IBM 2260 Display station Models 1 and 2, changes released in the following F. E. Supple-
and IBM 2848 Display Control Unit, Models I, 2, ments:
and 3. However, the description of the 2848 Dis-
Form Number Pages Affected Date
play Control pertains only to those units whose
Y27-2165-0 4-10, 4-11 and Sept. 11, 1967
serial numbers are 60,000 or above.
4-18
The following publications can be used to sup-
plement the information provided in this manual:
Y27-2171-0 v through vii, Dec. 1, 1967
IBM 2260 Display Station, IBM 2848 Display
1-3 through 1-6,
Control Maintenance Manual (Form
1-21,1-22,2-97,
Y27 -2047 -2)
2-98,2-123,
IBM 2260 Display Station, IBM 2848 Display
2-124,2-125,
Control FE Diagram Manual (Form
2-126, 6-1 through
Y27 -2048-2)
6-4, B-1 through
1052 Printer Keyboard and 1053 Printer Main-
B-3, X-I through
tenance Manual (Form 225-3179-2)
X-8 add pages
Medium Power Standard Power Supplies (Form
2-124A and 2-124B
223-2799-0)
IBM 1052, 1053 CEMI (Form 225-3179)
IBM System/360 I/O Interface - Channel to
Control Unit - Original Equipment Manu-
facturers Information (Form A22-6843-3)
ABBREVIA TIONS LIST
The abbreviations used in this manual, together with Abbreviation Definition
their definitions, are as follows:
EPO Emergency Power Off
Abbreviation Definition ETX End of Text
FC Feature Code
ACK Acknowledge LF Line Feed
ASCII American Standard Code for LRC Longitudinal Redundancy Check
Information Interchange MI Manual Input
CAN Cancel NAK Not Acknowledge
CRT Cathode-Ray Tube NDC Nondestructive Cursor
DAU Data Adapter Unit NL New Line
DC Display Control OLSA Off Line Selectric Analyzer
DS Display Station SMS Standard Modular System
EBCDIC Expanded Binary Coded Deci- SOH Start of Heading
mal Interchange Code STX Start of Text
EOM End of Message VRC Vertical Redundancy Check
EOT End of Transmission XA Transmit Adapter
This manual has been prepared by the IBM Systems Development Division
Product Publications, Dept. S20, CPO Box 120, Kingston, N. Y., 12401.
Address comments concerning the manual to this address.
@ International Business Machines Corporation 1967
(4/67)
Form Y27-2046-2, -3
FES Y27-2190
CONTENTS
CHAPTER 1 INTRODUCTION. 1-1 Test I/O Command