IBM 5280 User manual

: :~';'~ feChnical Newsletter
IBM 5280
Distributed Data
System
IBM 5285 Programmable Data Station
Maintenance Information Manual
© IBM Corp. 1980, 1981
This Newsletter No. SN20-9543
Date January 30, 1981
Base Publication No. SY31-0600-1
File No.
Previous Newsletters none
This technical newsletter provides replacement
pages for the subject publication. Pages to be inserted
and/or removed are:
v-viii
37,38
79-82
101,102
175,176
253,254
257,258
367,368
Changes to the text and illustrations are indicated by a vertical line at the left of the change.
Summary of Amendments
• Addition of Buffer timer
Note:
Please file this cover letter at the back of the manual to provide a record of changes.
© IBM Corp. 1981
IBM Corporation, Information Design and Development, Department 997, 11400 Burnet Rd., Austin, Texas 78758
Printed in U.S.A.

HOW TO USE THIS MANUAL. • • • • • • • • • • • • • • • • • • • ix
SAFETY ..... .
••••••••••••••••••• X
MAINTENANCE
BASE MACHINE LOCATIONS
001 Front View. . . . . . . . .
011 Rear View . .
With Covers . .
Without Covers
COVERS
031 Removal and Replacement.
Data
Station. . . . . . . . . .
Keyboard
.......... .
OPERATOR CONTROLS
· .. 1
· .2
.2
· .3
..4
· .. 4
· .. 6
071 Control Panel Removal and Replacement. . . . . . . . .7
073 Power Switch Removal and Replacement. . . . . . . . .8
075 Keylock Switch Removal and Replacement . . . . . .8
077 Screen Controls Removal and Replacement . . . . . 10
079 Drive-In-Use Indicator Removal and Replacement. . 11
KEYBOARD
10t Locations •......................
111 Break Code Service Check . . • . . .
113 Keyboard
Layout and Scan Codes. . .
66-Key Keyboard (Data
Entry) .... .
67-Key Keyboard (Data
Entry) .... .
69-Key Keyboard (Data
Entry) ... .
83-Key Keyboard
(Typewriter) . . . .
85-Key Keyboard
(Typewriter) . . . .
115 Keyboard Cleaning
......... .
121 Key Module Removal and Replacement •.
123 Spacebar Removal and Replacement . • . .
125 Flyplate Replacement
............. .
127
Pad Printed Circuit..soard Removal and Replacement.
DISPLAY ASSEMBLY
. 12
.13
.14
.14
.14
• 15
· 15
.15
.16
.16
· 17
•... 19
· .20
141 Locations. . . . . • . . . • . . . . . . . • . . . • 22
161 Video Adjustments . . . . . . . . . ..... 22
Brightness
Limiter Potentiometer. . . . • . . . . • . . • 23
Contrast
Control and Brightness Control. . . . . . • . 23
Video Gain/Video Drive Potentiometer
•........•.•. 23
163 Vertical Adjustments • . . . . . . . . . • . . . . . • . • • • . .
24
Vertical Hold Potentiometer. . . . . . . . . . . . . • • . . . . • 24
Vertical Height Potentiometer. . • . . . . . . . . . . 24
Vertical Linearity
Potentiometer. . . • . • .... 24
Linearity Phase Potentiometer . . . . . . • 24
165 Horizontal Adjustments. . . . . . . . . . . . 25
Horizontal
Width Potentiometer . . . . 25
Horizontal Centering Potentiometer . . . 25
167
Yoke Adjustment . . . . . . . . . . . . . . . . • . . . . 26
169 Centering
Adjustment. . . . . . . . . . . . • . • 27
171 Factory Adjustments .•.....•...•.. 27
Focus Potentiometer . . . . . . . . . . . • • 27
B+
Potentiometer. . . . . . . . . . . . . • . • . 27
Page of SY31'()600-1
As updated January 30, 1981
By
TN L SN20-9543
Contents
180 Glare Shield Removal and Replacement ...
181 Display Assembly Removal and Replacement
183 Display Screen Examples • . . . . . . .
KEYBOARD/DISPLAY CARDS
· .29
· .30
· .32
200 Keyboard/Display MPU Card (A-A 1) . . .. 33
201 Data Station Adapter Card (A-E1). . . . . . 34
203 Dual Data Station Adapter Card (A-E1) . . . 35
207 Keyboard/Display Storage Cards (A-B7) . . . 37
209 Buffer Timer Card (A-B1) ...................• 37
217 Display Cable Diagram . . . . . . . . . . . . . . . .
38
219 Keyboard Cable Diagram ..................... 40
220 Keyboard Logic Card J02 and J03 Connector ......... 43
227 IBM 5285 to IBM 5281 or IBM 5282 Cable Diagram .•... 44
229 Keylock Cable Diagram. . . . . . . . . . . .47
DISKETTE DRIVE
301 Diskette Drive Removal and Replacement
303 Diskette/Main MPU Card (A-C1) ...... .
305 Diskette Driver/Receiver Card (A-D1). .... .
313
IBM 5285 Local Diskette Drives (Addresses 4000 and
4400) .......................•......
319 IBM 5285 to Remote Diskette Drives (Addresses 4800
and 4COO) .............. .
MAIN STORAGE AND MAIN MPU
402 Feature Main MPU Card (A-E5) .
403 Feature Main Storage Card (A-B5).
POWER SUPPLY
451 Locations ....
453 AC Distribution
.48
.50
.53
.54
.56
.58
•. 59
.61
.62
455 DC Distribution .64
457 Power Supply Wiring Diagram . . . . 66
458 Logic Board Distribution. . . . . 68
461 Voltage Level Checks. . . . . . . . . .. 69
463 Ripple Voltage Level Check . . . . . . . . . . ..... 71
470 Power Supply Removal and Replacement ........... 72
471 Communications Feature Power Supply Card Removal and
Replacement
.............................• 74
474 Board Assembly Removal and
Replacement. . . . . . . 75
476 Resonant Capacitor C7 Removal and Replacement. . . 76
POWER CORD AND LINE FILTER
480 flemoval and Replacement . . . . . . . . . . . . . . . . • 77
LOGIC AND CARDS
501 Card Plug Chart ...................•.....• 79
503,"Gard Options .....................•.....• 80
505 Logic Board and Logic Card Part Numbers.. • ...... 81
513 Logic Card Cover Removal and Replacement ...•....• 86
515 Fan Shroud Removal and Replacement. . . . . 88
521 Logic Board Removal and Replacement . . • • .• 89
523 Logic Card Removal and Replacement . . . . . . 90
525 Fan Removal and Replacement . . . . . . • ... 91
531 Net List. . . . . . . . . . . . . . . . . . . . . . . . . • . 92
561 ROS Patch Card Locations and Cables .....
563 ROS Patch Card Removal and Replacement ..
565 ROS Patch Card Identification .......... .
101
102
104
v

PRINTER
705 Address . . . . . . . '.' . . . . . . . . . . . . . . . . . . . . • 105
711 Twinaxial Cable Continuity and Polarity Check ....... 106
713 Twinaxial Cable Quality Check . . . . . . . . . . . . . . . . 107
715 Station Protector Service Check. . . . . . . . . . . • . . . . 115
731 Printer MPU Card (A-D5). ................... 116
741 Printer Cable Diagram. . . . . . . . . . . . . . . . . . . . . . 117
MAGN ETIC STRIPE READER
751 Magnetic Stripe Reader Service Check ..•....•.... 118
761 Magnetic Stripe Reader Removal and Replacement
•.... 118
771 1 MSR and Elapsed-Time Counter Card (A-B1)
..•.... 119
7734 MSR and Elapsed-Time Counter Card (A-B1) ....•.. 119
785 MSR Cable Diagram (Machines
without Communications
Feature)
............................... 120
787 MSR Cable Diagram (Machines with Communications
Feature) . . . . . . . . . . . . . . . . . . . . . . . • . . . . . . .
122
COMMUNICATIONS
811 Communications MPU Card Jumpers (A-E5). . . . . . . 123
812 38LS Card Identification (A-D7) . . . . . . . . . . . . . 124
813 38LS Personalization-Nonswitched Network with
Manual Answer SNBU-United States and Canada. . . . 127
815 38LS Personalization-Switched Network-United
States and Canada. . . . . . . . . . . . . . . . . . . . . . . 128
817 38LS Personalization-Nonswitched Network with Auto
Answer SNBU-United States and Canada ............ 129
819 38LS Personalization-Nonswitched Network-
World Trade Countries (Except Canada) ............. 130
821 38LS Personalization-Switched Network-
World Trade Countries (Except Canada) ............. 131
823 EIA/CCITT Card Jumpers (A-D7) ............... 132
825 DDSA (A-D7) . . . . . . . . . . . . . . . . . . . . . . . 133
827 Line Plate Jumpers: World Trade Countries
(Except Canada) . . . . . . . . . . . . . . . . . . . . . . . 134
831 Procedures
for Using TRAP to Record Data ......... 136
833
EIA/CCITT Interface Testers. . . . . . . . . . . . . . . 141
835 PT-2 and TP Line Monitor ............... - .... 141
COMMUNICATIONS CABLE DIAGRAMS
861 EIA/CCITT Cable Diagram ................... 144
863 DDSA Cable
Diagram. . . . . . . . . . . . . . . . . . . . . . 146
865
38LS-Nonswitched-Cable Diagram ............. 148
867
38LS-Switched or SNBU-Cable Diagram .......... 150
869 38 LS-With WT Line Plate-Switched Network Cable
Diagram . . . . . . . . . . . . . . . . . . . . . . . .
152
COMMUNICATIONS CABLE CONNECTIONS
871 Communications External Cables 154
DIAGNOSTIC AIDS
901 Cable Diagram Description . . . . . . . . . . . . . . . . . . . 155
Direct Feed-Through
Circuit. . . . . . . . . . . . . . . . . . . 156
Inverting Driver/Receiver Circuit ................ 156
Non-Inverting Driver/Receiver Circuit. . . . . . . . 157
903 Resistor Terminator/Load .........•......... 158
Resistor
as Terminator ...................... 158
Resistor
as Load. . . . . . . . . . . . . . . . . . . . . 158
904 Multimeter/dB Adapter. . . . . . . . . . . . . . . . . . . . . 159
905 General Logic Probe. . . . . . . . . .. . . . . . . . . . . . . 161
911 Electrostatic Discharge Service Aids. . . . . . . . . . . • . . 162
921 Absolute
Dump Procedure . . . . . . . . . . 165
925 Parity Check Display Examples ................ 166
vi
931 Power-On Checkout and IPL. .............•..• 170
Condition Code Table for Power-On Checkout and IPL
Failures ....................••.......• 174
Diagnostic Diskette
1. . . . . . . . . . . . . . . . . . . . . . • 177
Diagnostic Diskette 2. . . . . . . . . . . . . . . . . . • . . . . 178
Diagnostic Diskette
3. . . . . . . . . . . . . . . . . . . . . . . 178
941
IPL Using Diagnostic Diskette 1 ..•............. 179
Diagnostic Loader Program . . . . . . . . . • . . . . . • . . • 179
951 Diagnostic Control Program (DCP) ..•.......•... 183
How to Load the Diagnostic Control Program ..•..•... 183
How to Interpret the DCP Display .....•......... 184
How to Control DCP During MDls ...•........... 185
How to Interpret DCP Error Messages . • . . . . • . . . . • • 186
961
MAP Diagnostic Integration (MOl) Tests .....•..•.. 187
Description
of MOl Tests .................... 188
963 Diskette Media Problems . . . . . . • . . . • . . . . . . . . .
190
965 Head Resolution Service Aid ...........•...... 191
971 Standalone Program Loading. . . . . . . . . . . . . . . . . . 192
975 Standalone Programs ......•.....•......... 193
System Exerciser Test (SYSTEST) . . . . . . . . . . . . • . . 193
Keyboard
Scan Code Test (SCANTEST). . . . . . . . . . . . 193
Magnetic Stripe Reader Test (MSRTEST)
....•...... 193
Display Exerciser Test
(CRTTEST). . • . . . • . . • . . • • . 193
Elapsed Time Counter Test
(TMRTEST1). . . . . • . • . . . 193
Elapsed
Time Counter Test (TMRTEST2) ........... 193
Printer Test (TPRNT)
....................•. 193
System Error Log Recovery Program (TSYSEREP) ..... 194
Diskette Surface Analysis Program
(TMEDIA) . . . . . . . . 196
Communications Error Log and Data Trap Recovery
Program (TCOMEREPL
............•...••.. 198
BSC Online Test Program (SYSBOL T) ........•..•. 203
BSC Online Tests Supported by the IBM 5280 .....••. 210
SDLC Link Test .......................... 211
Error Recording Tables ................•.•... 212
991 Display/Alter Function .......•........•.... 214
Printer Soft Error Recording Table .......•....•.. 222
993 Communications Error Tables ................. 223
Using the
Display/Alter Function to Display the
Communications Error Tables ................. 224
CCB Status Bytes and Counters .•............•.. 226
CCB Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . 232
BSC Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . 232
MRJE Error Codes ................•....... 234
SO LC Error Codes . . . . . . . . • . . . . . . . . • . • 235
Modem Control Error Codes .........•...•.•... 236
TOOLS AND TEST EQUIPMENT
TOOLS AND TEST EQUIPMENT .......•...•..•.. 237
THEORY
INTRODUCTION. . ...................• 239
Data Stations .........................•..• 239
IBM 5281 ., . . . . . . . . . . . . . . . . . . . . . . • . . . • 239
IBM 5282 . . . . . . . . . . . . . . . . . . . . . . . . . . . . • 239
Programmable Units
.......................• 240
IBM 5285 . . . . . . . • . . . . . . • • . . . . • . . • 240
IBM 5286 .........•.............. 241
IBM 5288 . . . . . . . . . • • • • • . • • . . . . . . • 242

Attachments and Features ..........•.•...•....• 243
Diskette Drives • . • . . • . . • . . . • . . • . . . . •
243
Printers. . . . . . . . . . • . . . 243
Keylock Feature . . . . . . . . . . . . . ....•. 243
Magnetic Stripe Reader Feature. . . . . • . . .. 244
Elapsed Time Counter Feature . . . • .. 244
Feature Main MPU . . . . . • . . •• .......•.... 244
Communications Feature . . . . . . . . . . .• 244
SYSTEM FUNCTIONAL OVERVIEW ........•.•.... 245
Loading a ~rogram .......................... 245
Executing a Program . . . ......•• 246
I/O Instructions. . . . . . . • . 246
Partition Pointers • .
Partition lOB ... .
Device MPUs
...... .
Keyboard/Display
lOB.
Indicators and Registers
Partition Work Area . .
SYSTEM LOGIC OVERVIEW .
MAIN STORAGE ACCESSING.
Storage Access Example . . . . .
KEYBOARD/DISPLAY ATTACHMENT
Keyboard/Display MPU
Keyboard Adapter . . • . . . . . . . .
Display Adapter. . .. . . . . . . . . .
Keyboard/Display MPU I/O Registers
Keyboard/Display Data
Flow ...
246
247
247
248
248
248
249
250
251
252
253
253
253
253
254
Function Keys. . . . . . . . . 255
Command Key Sequence. . . . •
.........•.. 255
Keyboard/Display Storage. . . . . . . . . . . • . . . . . . 256
Keyboard/Display Storage Addressing • . 256
Accessing Keyboard/Display Storage. . . . . . • . . . . . 257
Keyboard . . • . . . . . . . . . . . . . . . 257
Magnetic Stripe Reader. . . . . . . . . . • . . . . . . . • . . . 257
Elapsed Time Counter . . . . . . . . . . . . . . . . . . . . . • . • 258
Buffer Timer. .. .. .. ... ...... 258
DISKETTE ATTACHMENT. . • . . . . . 259
Diskette MPU . . . . . . . . . . . . . . . . 259
Diskette
lOB Pointers and lOBs. . . . .. ....... 260
Diskette Adapter . . . . . . . . . . . •
Diskette MPU to Adapter Commands
Write/Read Check Command . . .
Seek Command • . . . • . . . . • .
Recalibrate Seek •...
Read ID Command . . .
Read Data
Command. .
Write Data Command
..
Write 10 Command. . .
Write Control Data
Command. . .
Set Mode/Select Command • . . .
Read Diagnostic Command
....
Inhibit Control Data AM Command
Set Ready
Command. . . . . . . .
Reset Access Counter Command .
Diskette Adapter Registers
..
Sense Register 1.
Sense Register 2. . . . . .
Sense Register 3. . . . . . .
Command Register . . . . .
Drive Configuration Register
261
261
261
261
262
262
263
263
264
264
264
264
264
264
264
264
265
265
265
266
..........•.. ,266
Page of SY31-0600-1
As updated January 30, 1981
By
TN L SN20-9543
PRINTER ATTACHMENT ...
Printer MPU .... .
Printer Adapter
.. .
Driver/Receivers.
Timing Logic •.
Port Control Logic ..... .
Transmit Data
Multiplexor.
Receive Data Multiplexor ...
Serdes ...... .
Control Logic ......... .
Example Operation. . . . .
Printer Adapter Commands
..
Transmit Commands ....
Receive Commands. . . . .
Reset and Diagnostic Commands .
Printer Addressing
..
16-Bit Frame Concept .. .
Bi-Phase Encoding
.. .
Transmission Sequence.
Printer Commands
...
Poll Response Frames from the Printer. .
COMMUNICATIONS ATTACHMENT ... .
Typical Operation ............... .
Operation Examples . . . . . . . . . . . . . .
Communications MPU Commands and Responses
Communications MPU
to Adapter Registers ..
Transmit Data Register ..... .
Command Register ..... .
Command Return Register ..
Receive Status Register ... .
Receive Data Register
.. .
Diagnostic Register
...•.
Transmit Status Register ..
Diagnostic Return Register
Network Configuration Register
DCE Control Return Register ..
Timer Register. . . . . . . .
Li
ne Adapter Cards. . . . . . . . . . . .
38
LS Integrated Modem .'. . . . . .
Switched Network Connections ...
Nonswitched Network Connections
Communications Facilities Characteristics
.... .
Call and Answer Sequences .......... i~- ••
38LS for WT Switched Networks (PSN Adapter) .
Line Plate Operating Modes
.....•...
Communications Facilities Characteristics ....
Voltage Surge Protection. . . . ..•..
Digital Data Service Adapter.
EIA/CCITT .... ' ..... .
267
268
269
269
269
269
269
269
269
269
269
270
270
270
271
271
271
271
272
272
274
276
277
279
284
286
286
287
287
287
287
287
287
287
287
287
. . 287
287
287
292
296
297
297
299
301
304
304
304
310
Line Protocols. . . . . . . . . . . . ...•. 314
Binary Synchronous Communications (BSC) ......••. 314
BSC Control Characters . . . . . . . . . . . . . • . . . . 314
Synchronization Initiating and Terminating Sequences •.. 316
Control Sequences ........................ 318
Transparent Data
......................... 321
Differences Between
IBM 3741 Mode and IBM 3780 Mode. 321
Synchronous Data
Link Control ...... .
Commands and Responses ......... .
Commands and Responses Not Supported ..
322
324
325
vii

SDLC Commands and Responses in Hexadecimal Notation.. 326
XID Format. . . . . . . . . . . . 329
Transmission Examples. . . . . . . . . 330
Zero
Bit Insertion/Deletion. . . . . . . 336
NRZI (Nonreturn to Zero Inverted) . . 336
Systems
Network Architecture Support. . . 336
SNA Transmission Header Format . . . . . . 338
SNA Request Header Format . 339
SNA Response Header Format . . 340
SNA Response Sense Data. . . . . 340
SNA Sense Data Modifier Codes '. 341
viii
SNA Control Functions
Data
Flow Controls ...
Session Controls ...•.
Network Services-Maintenance. .
Configuration Services . . . . . . .
Session Services . . . . . . . • . .
FM Header
Format ............ .
342
343
346
355
.•... 357
357
358
GLOSSARY OF TERMS AND· ABBREVIATIONS •••••••• 359
INDEX ••••••••••••••••••••••••••••••••• 367

t'age ot :s Y;S l-tlbUU-1
As updated January 30, 1981
By TN L SN20-9543
207 KEYBOARD/DISPLAY STORAGE CARDS
(A-B7)
209 BUFFER TIMER CARD (A-B1)
The
IBM 5285 Programmable Data Station uses two types
of keyboard/display storage cards: type B and type
C.
The following figure and Table shows the location of the
jumpers and modules on the two cards, which card
to use
for each configuration, and the total storage available with
each configuration.
This diagram shows
the location of the components
on the buffer timer card.
Type B Type C
Configuration
Auxiliary
Data Station
Display Size Attached Type Size
None
6 lines
IBM 5281 C
2K
480 characters
IBM 5282 C
3K
None B 1 K
12 lines
IBM 5281 C
3K
960 characters
IBM 5282 C
4K
24 lines None B
2K
1920 characters
IBM 5281 C
5K
o
o
••••
ODD
Do
Keyboard/Display Storage Card
~irtal
'Keyboard/
Modules Jumpers Display
Installed Installed Storage
2K
e
4K
eandO
eand 8
5K
e
eande
3K
eand • eand •
5K
eand •
e,.,and.
6K
e •
4K
e,O,ande
e,e,e,e,andO
7K
207 Keyboard/Display Cards 37

217 DISPLAY CABLE DIAGRAM
The following cable diagram and table shows the physical
cable connections, each line name, and all
of the associated
connecting points; See 901
on how to use the cable
diagram. The arrow (-+) indicates the logical direction of
the signal. D indicates that the signal is repowered and
sent to the data station. R indicates that the signal is
received from the data station and repowered.
Card A1
___ -P"'IL - _
II II JI JI II
To Display Assembly
38
-
1
(455)
217
TP20
,/ TP18 (ground)
~L G
~~TPl
~~~ 0
~~'6
1 • +. '-
J01 ""'s:, 6 11
., 1
'I
I
---d
r---
I 2 G Brightness
~~
r ~~ntrast
l~ 1

Logic and Cards
501 CARD PLUG CHART
The card plug chart shows the card configurations for the
IBM 5285 Programmable Data Station. To determine
which card
to use, see 503.
DC4
1 3
• •
DC3 Ground DC2
1 10 +5 VdC\ \.,GrOUnd 1. 10
• •••••••• ••••••••
8 7 6 5 4
Keyboard/Display MPU
3
Page of SY31-0600-1
As updated January 30,1981
By TNL SN20-9543
DC1
10
•••••••••
2
A
Keyboard/Display StorageI .... 1 __ M_a_i_n_S_to_r_a_ge __ ....I1 "'1 ____ E_T_C_/M_s_R_&_E_T_C_'_B_uff_er_t_im_e_r ___ ---I B
Diskette/Main
MPU
C
....... __ L_in_e_A_d_a_p_t_er __ .....1 ... 1__ P_r_in_t_e_r _M_p_U __ ...... ll '- ____ V_F_O ___ ---III Diskette Driver/Receiver D
'-- __ c_o_m_m __ u_n_ic_a_ti_o_ns __ or __ F_ea_t_u_re_M __ a_in_M __ P_u _____ ~, .... 1 ___________ R __ em __ o_te __ D_at_a_s_t_a_ti_o_n ____________ E
501
Logic and Cards 79

Page of SY31-o600-1
As updated January 30, 1981
By TN L SN20-9543
503 CARD OPTIONS
The card option table shows which cards to use for the
different configurations available. See 501 for the card
plug chart.
Card
Location Function Size·
Reference Remarks
A1 Keyboard/display MPU 8-wide 200 Contains 2 K bytes
of keyboard storage
B1
Elapsed-time counter 2-wide 771, 773
B1
1-MSR and elapsed-time counter 2-wide
771
Communicating IBM 5285 only
B1
4-MSR and elapsed-ti me counter 4-wide 773 Non-communicating IBM 5285
only
B1 Buffer timer
2-wide 209 IBM 5285
w/o ETC
B5 Main storage 2-wide 403 Additional main storage
B7 Keyboard storage 2-wide 207 Additional keyboard storage
C1
Diskette/main MPU 8-wide 303 Contains 32 K bytes
of main storage
01 Diskette driver/receiver 2-wide 305 Non-communicating IBM 5285
only
03 VFO
2-wide 501
05
Printer MPU 2-wide
731
07 EIA
2-wide 823 Communicating IBM 5285
only
07
DDSA 2-wide 825 Communicating IBM 5285
only
07
38LS World Trade switched 2-wide 821
Communicating IBM 5285 only
07
38LS United States switched 2-wide 815 Communication IBM 5285
only
D7 38LS World Trade nonswitched 2-wide 819 Communicating IBM 5285 only
07
38LS United States nonswitched, 2-wide 813 Communicating IBM 5285
only
manual answer
07
38LS United States nonswitched, 2-wide 817 Communicating IBM 5285
only
SNBU, auto-answer
07
38LS United States nonswitched, 2-wide 813 Communicating IBM 5285
only
SNBU, manual answer
E1
Data station adapter 4-wide
201
Used when IBM 5281 is attached
E1
Dual data station adapter 4-wide 203
Used when IBM 5282 is attached
E5
BSC/SD LC communications 4-wide
811
Communicating IBM 5285 only
attachment
E5
Feature Main MPU
4-wide 402 Non-communicating IBM 5285
only
80
503

505 LOGIC BOARD AND LOGIC CARD PART
NUMBERS
The following chart supplies the logic board part
numbers and engineering change
level and the logic
card part numbers and engineering change levels for
the
IBM 5285 Programmable Data Station. If the part
number
of a card in the machine and the part number
for
that card in the chart do not agree, check the
customer engineer memorandums (CEMs) to ensure
that you have the correct card. If you do have the
correct card, write the new part number and the new
engineering change
level for that card in the blank
columns provided
in the chart. The cards are listed
with the oldest part number on the left and
the newest
part number
on the right.
505 Logic and Cards 81

Page of SY31'()600-1
As updated January 30, 1981
By TN L SN20-9543
505 LOGIC BOARD AND LOGIC CARD PART NUMBERS (continued)
Location Part No. Part
No.
Part No.
Size
Name E.C. Level E.C. Level E.C. Level
A-Board 4177481 4177481 7364107
10-28946 838494 839753
A-A1 Keyboard/ 7364486 6042977 4177598
8-Wide Display
MPU
10-29792 10-29968 838447
--_ .. --------_ .... _- .. - .. - ............
--- -- ----- .. _-- _ .. __ .. -
..... - .. ----- -----------_ ..
------------ .. ------_ .. -
R OS Patch for
Keyboard/
Display
MPU
A-A1 Keyboard/ 6042978 4177600 7364426
8-Wide Display MPU 10-29968 838449 10-29800
Katakana*
--- ------------------------
-------------------
--------------------_ ..
--------------_ .. -------
ROS Patch for
Keyboard/
Display
MPU
Katakana*
A-B1
Elapsed Time 1618152
2-Wide Counter* 837086
A-B1
1MSR and
7364620
2-Wide
Elapsed Time 840869
Counter*
A-B1 4MSR and 4177924 4177926
4-Wide
Elapsed Time 10-28996 839709
Counter*
A-B1 Buffer 6043571
2-wide Timer 868440
A-B5 16K 4177563 4177564 1618110
2-Wide Additional 10-28936 838415 839732
Main Storage*
A-B5 32K 4177561 4177562 1618108
2-Wide Additional 10-28936 838399 839730
Main Storage-
*Feature
82
505
Part No. Part No. Part No. Part No.
E.C. Level E.C. Level E.C. Level E.C. Level
-----_ .. _----------
------- .. ---------
--_ .. _-_ .. - .. _-- .. -------
-------------- .. ---
~------------------
-------- ---- .. -----
------_ .. _ .. --- ---- .... --
-----------_ .. _-_ .. --

561 RO$ PATCH CARD
LOCATIONS AND CABLES
The following figure shows where the different ROS
patch cards plug in on the logic board.
Signal Cable Connections
DC4 DC3 Ground
1 3 1 10 +5 Vdc \ / Ground 1
• •
•••••••••
'. .. .
8 7 6 5
DC2
10
••••••••
4
I Keyboard/Display
MPU
3
1
Page of SY31-Q600-1
As updated January 30, 1981
By TN L SN20-9543
DCl
10
• ••••••••
2 1
JA
IKeyboard/Display Storage II
Main Storage IL ETC/MSR & ETC/Buffer timer
IB
I Diskette/Main
MPU
JC
~
I Line Adapter
It
Printer MPU
I VFO
Il Diskette Driver/ReceiverID
'-r""'"
l Communications or Feature Main
MPU
I Remote Data Station IE
-r
J
IROS Patch
Communications or J
Feature Main MPU
I ROS Patch (Base Main MPU) I I
ROS Patch (Printer) 1
~
-,-
~
l
ROS Patch (Diskette) J I
ROS Patch (Kbd/Display) 1
-r -r:
Power Cable Connections
• •
•••
6 5 3
________________________________ K_e_y_b_oa_r_d_/D __ is_pl_a_y_M_p_U ____________________________ ~IA
I Keyboard/Display StorageI Lo.I ____ M_a_i_n_S_to_r_a_Qe __ ...... 11 .... ____ E_T_C_/_M_S_R __ &_E_T_C_/_B_u_f_fe_r_t_im_e_r _____ ..... I B
_________________________________ D_i_sk_e_tt_e_/_M_a_in_M __ P_U ________________________________ ...... Ic
'-- __ L_i_n_e_Ad_a_pt_e_r_--a
1 ..1
___ p_r_in_t_er_M_p_U _____ 11 .. ______ V_FO _______ ..... II Diskette Driver/ReceiverID
~ _____ CO __ m __ m_u_n_i~ __ t_io_n_s_o_r_F_e_at_u_r_e_M_a_in __ M_P_U ____ -J
l
Lo.
1
____________ R_e_m_o_t_e_D_a_t_a_S_ta_t_io_n __________ ....... IE
531 Logic and Cards
101

563 ROS PATCH CARD
REMOVAL AND REPLACEMENT
Removal
1. Power off.
2. Remove the data station covers (031).
3. Remove the logic card cover (513).
4. Disconnect
the signal cable Dfrom the ROS
patch card.
5. Remove
the retainer clip aand remove the power
cable from J0211.
6. If a power cable is present at J0311 , remove the
retainer clip
II and remove the cable.
7. Remove the ROS patch card.
CAUTION
The logic cards will overheat if patch cards (either ROS
patch or dummy patch) are not installed.
102 583
9. If you are not going to install a ROS patch card in
the same position
as the one you just removed,
install a dummy patch card in that position.
Replacement
For replacement of the ROS patch card, observe the
following and reverse the steps in the removal procedure.
1. Align the corner
cut on the Signal cable connector
II with the corner cut of the connector on the
ROS patch card.
2. Route
the cables correctly (561).

Page of SY31-oS00-1
As updated January 30, 1981
By TN L SN20-9543
931 POWER-ON CHECKOUT AND IPL (continued)
Condition
Code In Hex
00
04
08
oc
10
14
18
1A
1C
20
21
23
24
26
27
29
Description
The keyboard/display attachment has no data station attached.
The printer, communications,
or diskette· feature is not installed or the respective
display checkout has been started.
The printer, communications,
or diskette MPU check is complete.
Main storage check complete: the printer, communications, or diskette MPU
completed a write and read at the main storage address assigned to the attachment by .
the main MPU in microcode.
256-byte read/write main storage check complete: printer, communications"ordiskette
MPU completed a write and read of the first 256 bytes of main storage assigned to the
attachment by the main MPU microcode.
The printer, communications,
or diskette attact"\ment check is complete. The diskette
drive
is attached to the diskette attachment but another diskette drive is doing an IPL.
VFO error.
The keyboard/display attachment has a
data station attached.
Index pulses are too slow from the diskette drive attached to the diskette attachment.
Note: A diskette drive locking lever in
the open position can also cause this condition.
The keyboard/display attachment has a dual data station attached.
The keyboard/display attachment has a data station attached and ready,
but
the timer is not working.
Index pulses are too fast from the diskette drive attached to the diskette attachment.
The keyboard/display attachment has a dual data station attached and ready,
but the timer is not working.
Erase mismatch:
the diskette attachment write or erase gate was active during a read
operation, or write/erase sense was active during a read operation.
Storage overrun:
the diskette MPU was unable to obtain the required storage cycles
to transfer the data.
The diskette drive attached
to the diskette attachment deactivated the ready status
during a read operation.
No address mark detected:
the diskette attachment detected no address mark on the
diskette being read by this diskette drive.
CRC error: the diskette attachment detected a cyclic redundancy check (CRC) error
on
the diskette operation being performed.
Not used.
Media error:
the diskette attachment cannot process the data from this diskette
(damaged diskette or invalid
type data [969] ).
931 Power-On Checkout and
IPL 175

Page of SY31-Q600-1
As updated January 30, 1981
By TN LSN20-9543
931 POWER-ON CHECKOUT AND IPL (continued)
Condition
Code In Hex
2A
2C
20
2E
30
32
34
38
3C·
FF
176
Description
Control address mark detected: the diskette attachment detected a control address
mark
on the diskette operation being performed when no control address mark was
expected.
10 mismatch: the diskette attachment found an 10 on the diskette that did not match
the 10
that it was instructed to find.
The keyboard/display
attachment has a data station attached and ready and
the timer
is working.
Sense 2 invalid: during a diskette read or write operation
the bits set in the sense
register 2 are invalid.
Volume label error: the volume label format is not correct.
The keyboard/display
attachment has a dual data station attached and ready
and
the timer is working.
Non-IPL diskette: the diskette in this drive is not an IPL diskette.
Diskette
type error: the diskette type (type 1 or 20) on the volume label does not
match the diskette being used.
Label error:
the header label format is not correct.
IPL limits wrong: the IPL data set size is greater than the system main storage size.
Not used.
All diskette attachment checks are complete.
931

KEYBOARD/DISPLAY MPU
The keyboard/display MPU services each of the attached
devices sequentially. For example, when a key
is pressed
on a keyboard,
the MPU determines on which keyboard
the key was pressed, analyzes the keystroke data, and
processes
the data. The MPU uses data in keyboard/display
storage and main storage
to process the data as specified
by the application program. The following are some
of
the functions performed by the keyboard/display MPU:
• Translate keyboard scan code data to EBCDIC data.
• Access the appropriate main storage partition to process
keyboard/display data.
• Translate keyboard or main storage data to display code
and store
the code in the appropriate area of keyboard/
display storage.
• Activate the speaker on the keyboard when instructed
by
the application program.
• Move data, such as prompts, to the appropriate display
buffer in keyboard/display storage.
Read only storage (ROS)
in the MPU contains micro-
instructions that are executed by the keyboard/display
microprocessor to control the attached devices.
Keyboard/display storage is read/write storage that is used
to store translate tables, display buffers, and control infor-
mation for the keyboard and displays. This storage is
described later in this section.
KEYBOARD ADAPTER
The keyboard adapter connects
the keyboard to the
keyboard/display MPU. The adapter contains two or
three keystroke buffers to store data from the keyboard.
The adapter for keyboard 0 has two buffers and can store
two bytes
of data. The adapters for keyboards 1 through
3 have three buffers and can store three bytes
of data.
The adapter also deserializes
the data from the keyboard
and signals
the MPU when data is available.
Page of SY31-Q600-1
As updated January 30, 1981
By TN L SN20-9543
The keyboard adapter interfaces with the keyboard/display
MPU through I/O registers in the MPU. If a key is pressed
while the keystroke buffers are full and the main MPU is
not performing a keyboard service, the scan code for that
key is stored in a buffer in main storage.
DISPLAY ADAPTER
The display adapter handles
the physical functions of the
display. The adapter performs the following functions:
• Transfers data from keyboard/display storage to the
display screen
• Controls the timing of the horizontal and vertical
movements of the electron beam on the display screen
• Provides video control for the characters displayed on
the screen
• Controls the video for field attributes for data on the
screen
KEYBOARD/DISPLAY MPU I/O REGISTERS
There are four 1-byte I/O registers in the keyboard/display
MPU. The registers and their functions are described as
follows:
• A sense register (lOS)
that the MPU polls to
determine which keyboard activated service request.
The
IDS register is also used to receive the attention
signal from the main MPU.
• A command register (EAR) that the MPU uses to send
commands
to the device adapters.
• A data register (100) that the MPU uses to send data
to and receive data from the attached devices.
• A data buffer register (1008) that the MPU uses to
store the number of keyboards attached and to send
the attention signal to the main MPU.
Keyboard/Display Attachment 253

KEVBOARD/DISPLA V DATA FLOW
The following example shows how the keyboard/display
attachment, main MPU, and a program in main storage
read data
from the keyboard, store it in the I/O buffer in
main storage, and display
it on the screen. Refer to the
following diagram while:you read the example:
1.
2.
254
... -
o I , J 2 I 3
l 4 I 5 I 6 I 7
II
Pa"i.ion lOB (01
-I Kevboard/Oisplav lOB
-
J .
~
IIENTR Inslr,l
~~IScr •• n Forma. Control S.ring I
-Is,F,e,S. Tlblej
P
~ __ .rtl_tlon_'_~~,';
........ -
-'"
When the main MPU executes a keyboard I/O
instruction, it sets up the keyboard/display lOB 1m
in the partition, and signals the keyboard/display
MPU 1J.(by the attention line) that it has work to
do. The main MPtJ then flags the partition pointer
II to indicate that a keyboard operation is pending
for this partition.
The keyboard/display MPU checks the partition
pointer to determine which partition has the key-
board operation pending. When it finds the partition,
it resets the flag in the partition pointer and checks
the keyboard/display lOB
to determine the work
required. If the operation does not require operator
input (for example moving data from main storage
to keyboard/display storage), the keyboard/display
..... 0 •••
t------I :n~:~1 F==;;=Ad=dr=.,,=lnd=D="'I===f======:!J
3.
4.
MPU performs the operation, signals the main MPU
that the operation is complete, and checks other
partitions for work.
If the operation requested requires operator input,
the keyboard/display MPU sets bits in the partition
pointer and keyboard/display lOB to indicate that
there is a pending command requiring operator
input. The keyboard display MPU then continues
checking other partitions
for work.
When the operator presses a keyD 'the scan code
for the key is stored in the buffer in the keyboard
adapter
fJ (see Keyboard in this section for key-
board
to buffer data flow).

Accessing Keyboard/Display Storage
The following example shows. how a display adapter
accesses keyboard/display storage
to read data from the
display buffer. For this example, assume a dual data
station
is attached to the IBM 5285. Therefore, a dual
data station adapter card
is installed in location E1
(Refer
to logic diagram LOOOJ. Refer to diagram
LD05-2 while reading the following description.
1. The raster timing and storage interface logic on the
E1 card (L006-2) requests a storage cycle by acti-
vating the '-bit req 3 I/O' line (see the chart on
L006-2).
2. Keyboard/display storage control (KB/disp on
LD06-1) selects display adapter 1 by activating the
'+sel dev 3 I/O' line.
3. The raster timing and storage interface logic L006-2
responds by activating the '-storage req (I/O)' line.
The storage interface logic then puts the selected
keyboard/display storage address on the storage
address bus
('-I/O SAR bit 0 dot' through '-I/O
SAR bit 15 dot' lines).
4. The '-storage req (I/O)' line initiates a storage cycle.
During the cycle, the addressed data
is put on the
storage data bus (-I/O stg data bit P dot' through
'-I/O stg data bit 7 dot' lines). At the end of the
storage cycle, KB/disp storage control activates the
'- T comp I/O' line. This signals the storage inter-
face logic that the data is on the bus and ready to
read.
5. The storage interface logic reads the data and deacti-
vates the '-storage req I/O' line.
6. The KB/disp storage control deactivates the '- T comp
I/O' line, which deactivates the '-dev sel 3 I/O' line.
The storage cycle
is complete and the KB/disp
storage control can respond
to another request.
KEYBOARD
The keyboard has three major parts: key modules, the
pad printed circuit board, and the logic printed circuit
board.
Key modules contain the switches that are pressed
by
the operator. The pad printed circuit board below the
key senses a pressed key by capacitive coupling. The
logic printed circuit board, attached
to the pad printed
circuit board, contains a scan counter. The scan counter
tests each position on the pad printed circuit board one
position at a time. When a change
of capacitance is
detected, a scan code is generated for the key pressed.
The scan code
is sent serially to the data select logic in
the keyboard adapter on
the '+ serial data A' line. The
keyboard also generates a clock signal and a strobe signal
and sends them to the adapter on the '+ ser data clk A'
and '+ strobe A' lines to synchronize the transfer of data
from keyboard
A.
The adapter then signals the keyboard/display MPU by
activating a service request line. The service request line
indicates to the keyboard/display MPU that a keyboard
has data
to be transferred. During the time the keyboard/
display
MPU is responding to the service request, the
adapter is transferring the data to the serial to parallel
register. The data is deserialized in this register then read
by the
MPU and processed as specified by the application
program
(see KeyboardOata Flow in this section).
The first keyboard adapter (adapter 0) contains
two
buff~rs. All other adapters contain three buffers. If a
keystroke occurs and
all buffers are full, the data in the
first buffer is set to all 1's. This indicates to the keyboard/
display
MPU that a keystroke has been lost and the key-
board/display MPU detects an overrun condition. An
overrun can occur from extra clock pulses or noise
on the
clock line. The
MPU also detects an overrun condition if
it receives a scan code with bits one through seven on.
This can occur if the serial data line remains active during
a serial keyboard data transfer.
MAGNETIC STRIPE READER
The magnetic stripe reader (MSR) allows rapid entry of
data constants read from credit-card-like media. A maxi-
mum of four MSRs can be connected to a keyboard/display
attachment. The reader contains a read head, amplifiers,
and a card sensing photocell. The magnetic card contains
data and control characters, which are read by the reader
as follows:
• Start of message (SOM) character
• Users data
• End of message (EOM) character
• Longitudinal redundancy check (LRC) character
This information
is coded using four bits to define a
character and one bit
to provide odd parity.
Keyboard/Display Attachment 257

Page of SY31-Q600-1
As updated January 30, 1981
By TN L SN20-9543
When a card is inserted into the magnetic stripe reader,
the data is amplified, sent to the adapter, and stored in
the adapter buffer. When the data is in the buffer, the
adapter issues a service request to the keyboard/display
MPU and waits for the MPU to service the request.
When
the MPU detects that an MSR is waiting for service,
the MPU determines which MSR is requesting service and
reads a byte of data from
the adapter buffer. After the
MPU has processed the data, it reads another byte of
data, and so on, until all the data has been read. When
the final byte of data has been read, the adapter is reset
to allow the reader to accept another card.
Refer
to logic diagram LDOB. LD09 shows the logic for
the MSR adapter. The keyboard/display MPU controls
the adapter by sending commands on the '-EAR bit 0
dot'
through '-EAR bit 7 dot' lines. The MPU reads data from
the MSR on the '-100 in bit 0 dot' through '-100 in bit
7
dot' lines.
258
ELAPSED TIME COUNTER
The elapsed time counter is used to determine elapsed real
time. The counter
is attached to the keyboard/display
MPU through an MPU I/O register.
The
MPU reads the time and places it in the system control
area
in main storage. The counter is increased in incre-
ments of 1.6 seconds. An application program reads the
time and calculates elapsed time.
Refer
to diagram LD09. LD09shows the logic for the
elapsed time counter. The keyboard/display MPU
controls the counter by sending commands on the
'-EAR bit 0 dot' through '-EAR bit 7 dot' lines. The
MPU reads the counter data on the '100 in bit 4 dot'
through '-100 in bit 7 dot' lines.
BUFFER TIMER
The buffer timer provides a timeout to the key-
board/display
MPU. If the main MPU has not serviced the
keyboard before the timeout occurs, the keyboard/display
MPU reads the buffer for a command key sequence. If a
command key sequence has occurred,
the keyboard/display
MPU moves the scan code for the key to the keyboard/displa~
lOB and signals the main MPU. If a command key sequence
has
not occurred, a keyboard overrun condition occurs.

AC distribution 62
access control ring, main storage 250
access example, main storage 251
accessing keyboard/display storage 257
accessing main storage
250
ACTLU command 347
ACTPU command 346
adapter commands, printer
diagnostic-mode 271
diagnostic-reset 271
receive-mode 270
receive-read 271
reset 271
write-command-frame 270
write-data-frame 270
write-last-frame 270
adapters
communications
276
diskette 261
display 253
keyboard
253
printer 269
addressing storage, keyboard/display
adjustments
B+
27
Brightness control 23
brightness
limiter 23
centering 27
Contrast control 23
focus 27
horizontal centering 25
horizontal
width 25
linearity phase 24
vertical height 24
vertical hold 24
vertical linearity 24
video gain/video drive 23
yoke 26
attachments
communications
276
diskette 259
keyboard/display 252
printer 267
attentuator jumpers 123
autoanswer sequence 298
auxiliary data station cable diagram
257
44
B+ adjustment 27
base main MPU card 50
bezel location 1
bi-phase encoding,
printer 271
bid command
343
BIND command 347
break code service check 13
Brightness
control
adjustment 23
location 1
removal 10
replacement 10
brightness limiter adjustment 23
BSC online test program 203
tests supported 210
BSC protocols 314
control sequences 318
mUltipoint
320
point-to-point
318
BSC timeouts 317
buffer timer card 37
buffer timer
258
cable connections, communications
cable diagrams
auxiliary data station
44
DDSA 146
display
38
EIA/CCITT
144
how to use
155
keyboard
40
keylock 47
local diskette drives
54
MSR (with comm) 122
MSR
(without comm) 120
printer 118
remote diskette drives 56
video 38
38LS
nonswitched 148
switched
or SNBU 150
switched with line plate 152
cable reflections
112
calculating distance to cable problem
call and answer sequences 297
CAM error table 225
CAM program 277
cancel command 343
card insertion
tool location 3
card oPtions
80
card plug chart 79
Page of SY31-0600-1
As updated January 30, 1981
By
TN L SN20-9543
Index
154
108
Index 367