Wyse WY-50 User manual

WY-50 Display Terminal
Maintenance Manual
WYSE
I I I I

WY-50 DISPLAY TERMINAL
MAINTENANCE MANUAL
WYSE NO. 88-021-01

PUBLICATION HISTORY
Date Notes
~2-84
Initial publication.
RELATED PUBLICATIONS
Wyse No.
88-~11-~1
88-~2l-~1
TRADEMARKS
Title
WY-50 Display Terminal Reference Manual
WY-50 Display Terminal Quick-Reference Guide
WY-50 and WY-lOO are registered trademarks of Wyse Technology.
ADM-3l is a trademark of Lear Seigler/Data Products Division.
TeleVideo 910, 920, 925 are registered trademarks of TeleVideo
Systems, Inc.
ADDS Viewpoint is a trademark of Applied Digital Data Systems Inc.
Hazeltine 1500 is a trademark of Hazeltine Corp.
COPYRIGHT NOTICE
Copyright © 1984, Wyse Technology. All Rights Reserved Worldwide.
No part of this publication may be reproduced without the express
written permission of Wyse Technology.
ii

DISCLAIMER
No representations or warranties are made regarding the contents
of this manual, and any implied warranties or fitness for any
particular application are disclaimed.
The specification and information are subject to change without
prior notification. The right to revise this manual without
obligation to notify any person or organization is also reserved.
SAFE'l'Y WARNING
The terminal power cable is supplied with a safety ground. Do not
use the terminal with an ungrounded outlet. Disconnect the power
cable from the terminal before removing the top cover for any
reason.
Dangerous voltages are present when the terminal is ON and may
remain after the power is OFF. Be extremely cautious. Do not
work alone.
The internal phosphor of the CRT (cathode ray tube) is toxic.
Wear safety goggles and rubber gloves whenever the CRT is handled.
If the tube breaks, exposing skin or eyes to the phosphor, immed-
iately rinse the affected area with cold water and consult a
physician.
FCC WARRING
This equipment generates, uses, and can radiate radio
frequency energy, and if not installed and used in
accordance with the instruction .anual, .ay cause
interference to radio comaunications. It has been
tested and found to comply with the li.its for a Class
A computing device pursuant to Subpart J of Part 15 of
FCC Rules, which are designed to provide reasonable
protection against such interference when operated in
a commercial environment. Operation of this equi~ent
in a residential area is likely to cause interference,
in which case the user, at his own expense, will be
required to take whatever .easures .ay be required to
correct the interference.
iii

iv

TABLE OF CONTENTS
SECTION TITLE PAGE
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . .
ix
1.0 GENERAL INFORMATION . . . . . . . . . . . .
1-1
1-1
1-2
1-2
1-2
1-4
1-4
1-4
1-4
2.0
3.0
1.1 INTRODUCTION • • • • • • • • • •
1.2 SYSTEM FUNCTIONAL DESCRIPTION • • • • • •
1.3 MICROCOMPUTER.. ••• • ••
1.4 MEMORY • • • • • • •• •••
1.5
INPUT/OUTPUT DEVICES
1.5.1 KEYBOARD
1.5.2 CRT DISPLAY •
1.5.3 TELECOMMUNICATIONS
INSTALLATION •• • • • • • • • • • •
2.1 UNPACKING THE TERMINAL • • • •
2.2 ENVIRONMENTAL CONSIDERATIONS
2.3 OPERATOR CONTROLS • •
2.3.1 POWER CORD • • ••
2.3.2 KEYBOARD ••••
2.3.3 COMMUNICATIONS CABLING.
. . . . .
. . . . . . .
. . . .
2.3.4
2.3.5
POWER SWITCH
. . . . . . .
2.4
2.5
BRIGHTNESS CONTROL
. . . . .
SETUP PARAMETERS
DIAGNOSTICS • . . . . . . . . . . . .
. . . . . . . . . . . . . .
GENERAL MAINTENANCE INFORMATION
. . . . . . . . . .
2-1
2-1
2-2
2-3
2-3
2-3
2-3
2-4
2-4
2-4
2-5
3-1
3.1 MODULES....... •• • • • • • • •• 3-1
3.2 PRINTED CIRCUIT BOARD LAYOUT AND COMPONENT
IDENTIFICATION •• • • • • • • • •• 3-3
3.2.1 PRINTED CIRCUIT BOARD X-Y
COORDINATE SYSTEM • • • • • • • • 3-3
3.3 AC INPUT STRAPPING • • •• •• • 3-4
3.4 PREVENTATIVE MAINTENANCE • • • • • • 3-4
3.5 CONNECTOR INFORMATION • • • • • • • • • • 3-5
v

TABLE OF COR'l'ER'l'S (CORT)
SECTION
TITLE
4.0 THEORY OF OPERATION
4.1 INTRODUCTION
· . . .
· . . .
4.2
MICROCOMPUTER BOARD BLOCK DIAGRAM •
4.3
CRT AND POWER SUPPLY BLOCK DIAGRAM
4.4 KEYBOARD BLOCK DIAGRAM
· ·
4.5
FUNCTIONAL DESCRIPTION
· · · · · ·
4.5.1
MICROPROCESSOR.
• · · · ·
4.5.2 COMMUNICATIONS INTERFACE
4.5.3 DISPLAY MEMORY
· · · ·
4.5.4
NONVOLATILE MEMORY
· · · ·
4.5.5
KEYBOARD INTERFACE
· · · ·
4.5.6
VIDEO CONTROL • · · · ·
4.5.7 VIDEO CLOCK CIRCUITRY
· · ·
·
·
·
·
·
·
•
·
4.5.8
PROGRAMMABLE VIDEO CONTROLLER
4.5.9
ATTRIBUTE CONTROL • · · · · •
4.5.10 CHARACTER GENERATOR • · • · ·
4.5.11
ROW BUFFER DIAGNOSTIC REGISTER
4.5.12 VIDEO SHIFT REGISTER
· • · ·
4.6 RASTER
SCAN TERMINOLOGY
· · · · ·
· · · ·
· ·
· ·
· ·
· · · ·
· •
· · ·
· · · ·
· • · ·
· · · ·
· ·
· • · ·
• ·
· · ·
· ·
• ·
5.0 MAIRTENARCE INSTROCTIONS
5.1 MODULE REPLACEMENT
· . . . . . . . . . .
5.2
5.3
5.4
5.5
5.6
5.7
· . . . . . . . .
KEYBOARD REPLACEMENT . . . . . . . . . . . .
MONITOR/POWER SUPPLY REPLACEMENT • • •
MONITOR/POWER SUPPLY PC CARD REPLACEMENT
BRIGHTNESS POTENTIOMETER REPLACEMENT
AC POWER SWITCH REPLACEMENT • · . . . .
MICROCOMPUTER PCB REPLACEMENT • • • • •
PAGE
4-1
4-1
4-1
4-6
4-13
4-14
4-14
4-16
4-16
4-16
4-17
4-17
4-17
4-18
4-18
4-20
4-20
4-20
4-21
5-1
5-1
5-1
5-2
5-2
5-4
5-5
5-6
6.0 ALIGRMER'l'S • • • • • • • • • • • • • • • • • • •• 6-1
6.1 MECHANICAL ALIGNMENTS • ••••••• 6-1
6.1.1 POWER SUPPLY • • • • • • • • • • 6-1
vi

TABLE OF CONTENTS (CONT)
SECTION
TITLE
PAGE
6.1.2 MICROCOMPUTER PCB.
. . . . . .. . 6-1
6.1.3 KEYBOARD • • • • • • • • •• 6-1
6.1.4 MONITOR..... •••••••• 6-1
6.2 ELECTRICAL ALIGNMENTS • • • • • • • • • • •• 6-1
6.3
6.2.1 POWER SUPPLY • • • • • • • • • • • •
6.2.2 MICROCOMPUTER PCB • • • •
6.2.3 KEYBOARD • • • • ••••
6.2.4 MONITOR. • • • • • • • • • •
6.2.4.1 VERTICAL HOLD •••••••
HEIGHT
VERTICAL LINEARITY
FOCUS • • • • • •
WIDTH • • • • • •
. . . .
. .
6.2.4.2
6.2.4.3
6.2.4.4
6.2.4.5
6.2.4.6
6.2.4.7
DISPLAY CENTERING •
DISPLAY LEVELING
. . . . .
KEYBOARD CABLE REPLACEMENT
6-1
6-3
6-3
6-3
6-4
6-4
6-4
6-5
6-5
6-5
6-6
6-6
7.0 PERFORMANCE TESTS AND TROUBLESBOO'.rING PLOW CHART 7-1
7.1 POWER-ON SELF TEST • • • • • • • • • •• 7-1
7.2 DIAGNOSTIC SELF TEST • • • • • • 7-2
7.3 TROUBLESHOOTING FLOW CHART • • • • • •• 7-2
vii

FIGURE HUMBER
1-1
1-2
1-3
2-1
2-2
2-3
3-1
3-2
3-3
4-1
4-2
4-3
4-4
4-5
5-1
5-2
6-1
7-1
7-2
TABLE HUMBER
7-1
viii
TABLE OF FIGURES
FIGURE TITLE
SIMPLIFIED BLOCK DIAGRAM
MEMORY MAP
KEYBOARD
SHIPPING CONTAINER
SPACE REQUIREMENTS
REAR PANEL
MAJOR MODULES (EXPLODED VIEW)
MICROCOMPUTER PCB
AC INPUT STRAP LOCATIONS
(MONITOR/POWER SUPPLY)
MICROCOMPUTER PCB BLOCK DIAGRAM
MONITOR/POWER SUPPLY BLOCK DIAGRAM
HORIZONTAL OSCILLATOR TIMING
VERTICAL TIMING
KEYBOARD BLOCK DIAGRAM
ORIENTATION VIEW OF TERMINAL AND
COMPONENT NAME
MONITOR/POWER SUPPLY
DISPLAY CENTERING
TCOM TEST PLUG
TROUBLESHOOTING FLOW CHART
TABLES
TABLE
TITLE
ERROR MESSAGE DEFINITION
PAGE
1-1
1-3
1-5
2-1
2-2
2-3
3-2
3-3
3-4
4-7
4-9
4-11
4-12
4-13
5-1
5-3
6-7
7-2
7-3
PAGE
7-1

Physical
Display
Keyboard
SPECIFICATIONS
Display Console
Footprint
Keyboard
Finish
Shipping Weight
CRT
Format
Characters
Character Set
Language
Keyboard Codes
Attributes
Cursor
Type
12"H x 12.3"W x
13"0
12.2S"W x 10.25"0
2.2S"H x 17.2S"W x 7.6"0
Two-tone gray
30 Ibs. (approx.)
14" diagonal with non-glare
green phosphor. Front
mounted power ON/OFF and
intensity control. 13
degree tilt and 270 degree
swivel.
24 rows x 80 or 132 columns
(user selectable), plus 2
rows
for terminal status and
function key indentifi-
cation.
80-column: 7 x 13 matrix in
10 x 13 cell. l32-column:
7 x 13 matrix in 9 x 13
cell.
128 ASCII, upper/lower case
including 32 control codes
and line drawing graphics.
US (American), UK (British),
French, German, Danish,
Spanish
Normal, dim, blink, blank,
reverse, underscore, and
combinations.
Block or line; blinking/-
nonblinking (user
selectable.)
Low-profile detached, with
6-foot coiled cable. Two-
position tilt with low
position to DIN specifi-
cation.
ix

Keyboard (Cont)
Ca.aunications
Punctions
x
SPECIFICATIONS (CORT)
Layout
Type
Mode
Baud Rates
Character Format
Handshake
Protocols
Cursor Movement
101 keys arranged in type-
writer, numeric pad, and
function key sections. 16
user programmable function
keys providing 32 separate
codes.
Two asynchronous EIA RS-232C
ports: modem (main) and
auxiliary (printer). Baud
rate, character size,
parity, etc. can be speci-
fied independently for each
interface.
Block or conversational;
half or full duplex (user
selectable) •
Can be specified inde-
pendently for each
interface.
7 or 8 data bits; 1 or 2
stop bits; odd, even, mark,
or no parity (user
selectable).
XON/XOFF, DTR, both, or none
(user selectable).
Left, right, up, down, home,
tab, back tab, line feed,
direct X-Y addressing.
Editing Functions Erase memory, erase to
end-of-line/field, erase to
end-of-screen, insert and
delete line/character.
Form Data Entry Protect mode ON/OFF, write
protect mode ON/OFF. Pro-
tected data can be selected
as dim, reverse, or normal.
Message Fields Local and host message
fields in top row. Host
controllable 26th row
displays function key
labels, shifted and un-
shifted.

Functions (Cont)
COJIpatibility
Enviromaent
Power
SPECIFICATIONS (CORT)
Soft Setup
Native Mode
Compatible Mode
Operating Temp
Storage Temp
Humidity
Altitude
Standard
Optional
wattage
Nonvolatile memory permits
soft setup from keyboard for
data communications
parameters, operating modes,
function key sequences, etc.
WY-100
ADM-3l
TeleVideo 910, 920, 925
ADDS Viewpoint
Hazeltine 1500
320
to l13
0F (00
to +450 C).
-40
0
to +1400F (-40
0
to
+600 C).
10% to 90%, non-condensing.
Sea level to 15,000 ft.
90 to 130 VAC, 60 Hz +5%
200 to 240 VAC, 50 Hz +5%
45 watts
xi

xii

1.0 GENERAL INFORMATION
1.1 INTRODUCTION
The Wyse .WY-SO is a compact, high performance, low cost terminal
capable of meeting the needs of a wide variety of applications.
The WY-SO consists of a display console and a detached keyboard
from which data can be entered for display on the CRT. All of the
electronics necessary to support the display and keyboard are
contained within the display console itself.
In addition to the CRT and keyboard, the WY-SO contains two
independent telecommunication interfaces. Peripherals, such as a
hard copy printer, connect to the terminal via interface con-
nectors on the rear panel.
All the component parts are organized around and controlled by the
microcomputer. The microcomputer controls all internal data
manipulation and processing functions. Figure 1-1 is a simplified
block diagram of the WY-SO.
r---l
I EXTERNAL 114--..."
I PRINTER I "'-/----1 MICROPROCESSOR UART
L ___ .J
KEYBOARD
PROM
+5V
INTERNAL BUS ±1 2V
DATA, ADDRESS, POWER
-23V
RAM
CRT
CONTROLLER
-
CHARACTER
GENERATOR
CIRCUITRY
r---l
I EXTERNAL I
Z
-----t~ ... 1 HOST I
L ___ J
MONITOR/
POWER SUPPLY
VIDEO/
TIMING
Figure 1-1. SIMPLIFIED BLOCK DIAGRAM
1-1

general information
1. 2 SYSTEM PURC'1'IORAL DBSCRIP'l'IOR
The WY-SO consists of a microcomputer, a CRT controller, asso-
ciated control logic, and input/output devices. This circuitry is
mounted on a single printed circuit board located in the display
console pedestal. All the basic functions are controlled by the
microcomputer. Timing and control signals for the CRT are gen-
erated on the microcomputer printed circuit board. The deflec-
tion, high voltage, and power supply circuitry is located on a
single printed circuit card which sits just below the neck of the
CRT. The microcomputer card and the CRT power supply card are
interconnected by cabling. Both cards are housed within the
display console.
1.3 MICROCOMPUTER
The heart of the WY-SO is an 8-bit, single component microcomputer
which has 128 bytes of RAM, 32 I/O lines, two 16-bit counter/
timers, a full duplex UART (universal asynchronous receiver/trans-
mitter), and integral interrupt and clock circuitry. The micro-
computer uses an external EPROM for program storage. This EPROM
can be either 4K, 8K, or 16K bytes. In addition to EPROM, a
buffer consisting of up to 4K of RAM is utilized for display
memory. The microcomputer connects to a bidirectional bus to
which the CRT controller and telecommunications interface elec-
tronics are connected. These circuits can perform their functions
independently while interfacing with the microcomputer or the
memory on a DMA (direct-memory access) or interrupt basis.
1.4 MEMORY
The memory consists of RAM, EPROM, and EAROM. EPROM is used for
program storage and contains the power-up and self test routines.
The EAROM (electrically alterable read-only memory) is used to
store the operator's setup parameters (such as baud rate and
parity). RAM is used to store display information which is
repeatedly read out of the memory by the CRT controller to refresh
the CRT screen.
The microcomputer has an address range capability of 64K bytes.
In addition to this addressing range capability, the microcomputer
treats external program storage (EPROM) separately (it has its own
enable line). This means that external EPROM can consume an
additional 64K bytes of memory space without infringing on the
space available for I/O or RAM. Figure 1-2 is a memory map for
the WY-SO. Note that EPROM is not shown, as it does not occupy
I/O or memory address space.
1-2

HEX ADDRESS
0000H
1000H
2000H
3000H
4000H
5000H
6000H
7000H
8000H
90q>0H
A0([)0H
B000H
C000H
D000H
E000H
F000H
0FFFH
1FFFH
2FFFH
3FFFH
4FFFH
5FFFH
6FFFH
7FFFH
8FFFH
9FFFH
AFFFH
BFFFH
CFFFH
DFFFH
EFFFH
FFFFH
1st 2K OF RAM
2nd 2K OF RAM
CRT CONTROLLER
S.I.O. (UART)
ROW BUFFER
DIAGNOSTIC REGISTER
KEYBOARD LATCH
EAROM
UNASSIGNED
general information
RAM
CRT CONTROLLER
UART
ROW BUFFER
DIAGNOSTIC REGISTER
KEYBOARD
EAROM
Figure 1-2. MEMORY MAP
The standard RAM capacity is 4K bytes and consists of two 2K x 8
RAM chips.
Each 2K x 8 bytes RAM is allocated 8K bytes of addressing space.
The lower RAM address range is ~~~~H to 1FFFH. The upper RAM is
from 2~~~H to 3FFFH. Since each RAM uses only 2K bytes of address
space, the RAM addressing wraps around at 2K bytes page bound-
aries. The system firmware addresses the RAM from 18~~H to 27FFH
in order to access 4K bytes of unique contiguous locations.
1-3

general information
1.5 IRPUT/OUTPUT DEVICES
The input/output devices consist of a keyboard, a CRT display, and
two
telecommunication interfaces.
1-4
1.5.1
KEYBOARD
The keyboard consists of 101 keys mounted on a single-sided
printed circuit board. All keys are momentary action key
switches. They are scanned periodically by the micro-
computer to determine if a key closure has occurred.
Figure 1-3 illustrates the WY-SO keyboard. A more complete
description is found in Section 4.4.
1.5.2
CRT DISPLAY
The WY-SO features a l4-inch CRT. It displays 24 rows of
characters (either SO or 132 column) and 2 control rows (one
for terminal status and one for function key identifi-
cation). The displayed characters are read from RAM by the
CRT controller on a direct-memory access basis. The CRT
also contains an integral power supply which provides power
for the rest of the logic.
1.5.3
TBLBCOMIIURICATIORS
The WY-SO has two independent asynchronous interfaces which
conform with the EIA standard RS-232C. Data rates can be
set independently for either interface. These parameters
are operator controlled and are defined in the setup pro-
cedures in the Installation section of this manual (2.4).
The primary (modem) interface can communicate at data rates
up to 3S.4K bps. The auxiliary (printer) interface can
communicate at data rates up to 19.2K bps.

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general information
1-6

2.0 INSTALLATION
2.1 UNPACKING THE TERMINAL
The WY-50 is shipped in a special container that protects it from
shipping damage (see Figure 2-1). Instruction documents are
packed in the same container.
To remove the terminal, set the container on a convenient flat
surface; cut the tape holding the top of the box closed and fold
back the lid. Place your hand across the exposed styrofoam
supports for the terminal and simultaneously turn the box upside.
down. The box can now be lifted off the terminal. Next, rotate
the terminal so it is laying on its side. This allows one of the
styrofoam inserts to be removed. Then the keyboard can be
removed. Rotate the terminal again so it is setting on its
pedestal. The other styrofoam insert can now be removed. The
power
cord is packed in one of the external cavities of the
styrofoam inserts.
STYROFOAM INSERTS
POWER CORD
WYSE
I I I I
Figure 2-1. SHIPPING CONTAINER
2-1