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⟦b3b47fed4⟧ Wang Wps File
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Notes: CPS/TMA/026
Names: »3909A «
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└─⟦219ec82bd⟧ Bits:30006169 8" Wang WCS floppy, CR 0292A
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WangText
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ON-THE-JOB-TRAINING FOR CAMPS
VIDEO DISPLAY UNIT …02… Issue 1…02…CAMPS
CAMPS VIDEO DISPLAY UNIT
ON-THE-JOB-TRAINING, MANUAL
CPS/TMA/026
CDRL Logistic Support No. 03A
Line Item No. 8.2.4-B
Leif Thorsby
Bj]rn Stender Petersen
Kurt Nybroe-Nielsen
SHAPE (2), KNN, ORP, QA, GQAR, LT, ER[,
Conf.Mgmt., LU
ILS Manager 840315
2
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ON-THE-JOB-TRAINING FOR CAMPS
VIDEO DISPLAY UNIT Issue 1…02…CAMPS
her inds`ttes first aid
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ON-THE-JOB-TRAINING FOR CAMPS
VIDEO DISPLAY UNIT…02… Issue 1 CAMPS…0e…
830815 All First Issue of document
840315 All Second Issue of document
is updated in accordance
with CAMPS Log. No.
1563, dated 13 Jan.
1984.
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ON-THE-JOB-TRAINING FOR CAMPS
VIDEO DISPLAY UNIT …02… Issue 1…02…CAMPS
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ON-THE-JOB-TRAINING FOR CAMPS
VIDEO DISPLAY UNIT …02… Issue 1…02…CAMPS
T̲A̲B̲L̲E̲ ̲O̲F̲ ̲C̲O̲N̲T̲E̲N̲T̲S̲
1. INTRODUCTION ............................ 01
2. TERMINAL CONFIGURATION, OPERATION
AND DIAGNOSTICS ......................... 03
2.1 LEARNING OBJECTIVES ................... 03
2.2 PROGRAMMED UNIT ....................... 05
2.3 LIST OF IMPORTANT TERMS AND CONCEPTS .. 11
2.4 MULTIPLE CHOICE SELF-QUIZ ............. 17
2.5 MULTIPLE CHOICE SELF-QUIZ ANSWERS ..... 20
2.6 SAMPLE TROUBLESHOOTING ................ 21
3. PRINT AND COMMUNICATIONS FACILITIES ..... 23
3.1 LEARNING OBJECTIVES ................... 23
3.2 PROGRAMMED UNIT ....................... 25
3.3 LIST OF IMPORTANT TERMS AND CONCEPTS .. 29
3.4 MULTIPLE CHOICE SELF-QUIZ ............. 33
3.5 MULTIPLE CHOICE SELF-QUIZ ANSWER ...... 36
3.6 SAMPLE TROUBLESHOOTING ................ 37
4. MODULE LEVEL REPAIR ..................... 39
4.1 LEARNING OBJECTIVES ................... 39
4.2 PROGRAMMED UNIT ....................... 40
4.3 LIST OF IMPORTANT TERMS AND CONCEPTS .. 47
4.4 MULTIPLE CHOICE SELF-QUIZ ............. 53
4.5 MULTIPLE CHOICE SELF-QUIZ ANSWER ...... 56
4.6 SAMPLE TROUBLESHOOTING ................ 57
APPENDIX A: SOLUTIONS TO THE TROUBLESHOOTING ..........59
INSERTION OF PROBLEMS FOR TROUBLESHOOTING..60
APPENDIX B: BOARD-LEVEL TROUBLESHOOTING FLOW CHART ... 61
APPENDIX C: INTERPRETATION OF RAM ERROR MESSAGES ..... 63
APPENDIX D: INTERPRETATION OF EPROM ERROR MESSAGES ... 65
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ON-THE-JOB-TRAINING FOR CAMPS
VIDEO DISPLAY UNIT …02… Issue 1…02…CAMPS
A̲P̲P̲L̲I̲C̲A̲B̲L̲E̲ ̲D̲O̲C̲U̲M̲E̲N̲T̲S̲
1. VDU OPERATORS MANUAL
CPS/OPM/007
2. VDU REFERENCE MANUAL
CPS/REM/001
3. VDU MAINTENANCE MANUAL, VOL. I
CPS/TCM/006
4. VDU MAINTENANCE MANUAL, VOL. II
CPS/TCM/007
1 I̲N̲T̲R̲O̲D̲U̲C̲T̲I̲O̲N̲ ̲
This course is designed to help the service engineer
to study the existing maintenance documentation for
the Delta 7260T Video Display Terminal. It should be
used in conjunction with the VDU Operator's, Reference
and Maintenance manuals, and is divided into three
sections to cover:
2. TERMINAL CONFIGURATION, OPERATION AND DIAGNOSTICS
3. PRINT AND COMMUNICATIONS FACILITIES
4. MODULE-LEVEL REPAIR
Each of these sections parallels a specific area of
the terminal documentation, and is divided into six
units:
1. LEARNING OBJECTIVES
The first unit sets out the learning objectives of
the current section. These act to focus attention on
the most important information contained in the section,
and may subsequently be reviewed to evaluate the learning
process.
2. PROGRAMMED UNIT
The second unit of each section uses a technique of
learning known as "programmed instruction". This consists
of a preview of the text material which incorporates
a self-test procedure. The unit is formulated in such
a way as to establish some of the key ideas and concepts
presented in the text, and enables the engineer to
read the text material with greater understanding.
The correct responses to the questions are printed
in the following sub-unit.
After reading the first two units, the engineer must
study the appropiate section of the VDU documentation,
referring to other areas of the terminal documentation
where necessary. The "Learning Objectives" unit must
be reviewed in conjunction with the text to ensure
that the required learning objectives have been acheived.
3. IMPORTANT TERMS AND CONCEPT
Having read the VDU documentation the engineer must
work through the "Important Terms and Concepts" unit,
filling in as many of the blank spaces as possible.
Any difficulties will indicate areas to be revised.
The correct responses are printed in the following
sub-unit.
4. MULTIPLE CHOICE SELF-QUIZ
The multiple-choice self-quiz must be attempted after
the "Important Terms and Concepts" unit. Since it will
be necessary to refer to the VDU documentation to answer
most of these questions, the time taken to locate each
answer will give a clearer indication of how much has
been learned than the actual "score".
5. MULTIPLE CHOICE SELF-QUIZ ANSWER
The correct responses to each quiz are listed in this
section.
6. SAMPLE TROUBLESHOOTING
The final unit of each section consists of a worked
example of the troubleshooting techniques necessary
for the relevant level of servicing. A suggested solution
to each example is given in appendix A of this document.
2̲ ̲ ̲T̲E̲R̲M̲I̲N̲A̲L̲ ̲C̲O̲N̲F̲I̲G̲U̲R̲A̲T̲I̲O̲N̲,̲
O̲P̲E̲R̲A̲T̲I̲O̲N̲ ̲A̲N̲D̲ ̲D̲I̲A̲G̲N̲O̲S̲T̲I̲C̲S̲
To be used in conjunction with VDU OPERATORS MANUAL,
CPS/OPM/007, Section 1 (Introduction to the 7260T Terminal)
to Section 3 (Advanced Operations) inclusive, and VDU
REFERENCE MANUAL, CPS/REM/001, Section 3.9 (Diagnostic
Testing). All references to the "Local Host" or Disk
functions should be disregarded.
2.1 L̲E̲A̲R̲N̲I̲N̲G̲ ̲O̲B̲J̲E̲C̲T̲I̲V̲E̲S̲ ̲
This section is intended to introduce you to the methods
of operating and configuring the terminal. After reading
it you should be able to perform the following operations:
Power up and configure the terminal for stand-alone
operation.
Use the Text Processing functions.
Use the Program Function keys.
Configure the Split Screen.
Operate the terminal in Format mode.
Operate the terminal in Display Control mode.
Run the terminal diagnostics.
A restricted passwork is used to control access to
the Terminal Diagnostics. The password is DIAG, and
should be input (in Capitals) when requested by the
Diagnostic menu. It must be stressed that this password
is used to protect the system from possible misuse,
and under no circumstances should it be divulged to
unauthorized personnel.
2.2. P̲R̲O̲G̲R̲A̲M̲M̲E̲D̲ ̲U̲N̲I̲T̲
Work through sub-unit 2.2.1 BEFORE reading the appropriate
part of the VDU Manuals, filling in as many gaps as
possible. The answers, which will establish some of
the key ideas and concepts presented in the manuals,
will be found at the following sub-unit (2.2.2).
2.2.1 P̲R̲O̲G̲R̲A̲M̲M̲E̲D̲ ̲U̲N̲I̲T̲
The 7260T terminal has a detachable typewriter-style
keyboard which generates all 128 ASCII characters.
In
addition to the normal QWERTY keypad, the ........
includes: a Numeric and Program Function keypad, a
Display Control keypad, a group of Text Processing
keys, a Program Function keypad and a Miscellaneous
Control Function keypad.
The terminal stores data entered from the keyboard
or
received from the host computer in ..... Memory. This
Memory can contain up to 21,200 characters in a "packed"
format, which represents any trailing spaces at the
end of a line with an EOL character.
A 2248-word segment of memory is reserved as Display
Memory, and is accessible by the ....... screen, the
terminal and the host computer. Display Memory provides
storage for 2240 data characters, corresponding to
the screen's 28 lines of 80 characters.
The dispslay screen accommodates up to 2240
characters arranged in 28 lines of ... characters each.
The first display line, called the Status Line, is
reserved and alerts the operator to terminal operating
conditions.
The cursor marks the position to be occupied by the
next character to be entered or the character to be
acted on by an entered command. The ...... may be displayed
as either a blinking or non-blinking block.
The 80 x 27 screen area can be divided into as many
as eight independent "screen splits", each of which
may be considered as a separate terminal once it has
the
cursor placed in it. Each ..... has its own database
memory, and changes in one do not affect another's
data.
The shape of the screen ..... can be displayed differently
(via new parameters entered in the Split Screen table)
without affecting the contents of its database memory.
2.2.1 P̲R̲O̲G̲R̲A̲M̲M̲E̲D̲ ̲U̲N̲I̲T̲ ̲(cont'd)
The Split key (located next to the RESET key) is used
to move the cursor between ...... . The cursor will
not move into an undefined or improperly defined split:
The topmost line of the screen is reserved as the
Status Line. The ...... Line is used to alert the operator
of specific operating modes and conditions. A message
on the left side of the Status Line applies to the
current split (i.e. where the cursor is currently located).
A message in the centre or right may apply to any or
all splits.
The terminal has a monitor mode which serves as a high-level
control point for the terminal system. The monitor
is accessed via the MON key which causes the
....... menu to be displayed on the screen. The operator
may step through the items in the Monitor menu using
the RETURN, TAB or Cursor Movement keys.
The operator may key in commands to move, copy, delete
or insert text within the Text Memory. Segments of
text that are to be manipulated by a specific Text
Processing function must be defined by the operator
before the function can be executed.
Text segments that may be ....... include words, sentences,
paragraphs, blocks and lines.
The keyboard contains a special set of 36 Program
Function (P.F.) keys. Each of the ...... ........
keys is used to enter a string of user-programmed data
via a single keystroke.
Data entry operations that require entered data to
be constrained by a rigid screen format are performed
in
Format mode. In ...... mode, the operator keys data
into a user-created format displayed on the terminal's
screen, via a "fill-in-the-blanks" approach.
Display Control mode causes all ....... characters
and Shift Out sequences to be displayed on the screen
rather than being acted upon by the terminal. This
is useful for observing the content of information
received from the host computer as a maintenance aid.
2.2.2 P̲R̲O̲G̲R̲A̲M̲M̲E̲D̲ ̲U̲N̲I̲T̲ ̲w̲i̲t̲h̲ ̲c̲o̲r̲r̲e̲c̲t̲ ̲r̲e̲s̲p̲o̲n̲s̲e̲s̲
The 7260T terminal has a detachable typewriter-style
keyboard which generates all 128 ASCII characters.
In
keyboard addition to the normal QWERTY keypad, the ........
includes: a Numeric and Program Function keypad, a
Display Control keypad, a group of Text Processing
keys, a Program Function keypad and a Miscellaneous
Control Function keypad.
The terminal stores data entered from the keyboard
or
Text received from the host computer in Text Memory ....
Memory can contain up to 21,200 characters in a "packed"
format, which represents any trailing spaces at the
end of a line with an EOL character.
A 2248-word segment of memory is reserved as Display
display Memory, and is accessible by the ....... screen, the
terminal and the host computer. Display Memory provides
storage for 2240 data characters, corresponding to
the screen's 28 lines of 80 characters.
The display screen accommodates up to 2240
80 characters arranged in 28 lines of ... characters each.
The first display line, called the Status Line, is
reserved and alerts the operator to terminal operating
conditions.
The cursor marks the position to be occupied by the
next character to be entered or the character to be
cursor acted on by an entered command. The ...... may be displayed
as either a blinking or non-blinking block.
The 80 x 27 screen area can be divided into as many
as eight independent "screen splits", each of which
may be considered as a separate terminal once it has
the
split cursor placed in it. Each ..... has its own database
memory, and changes in one do not affect another's
data.
split The shape of the screen ..... can be displayed differently
(via new parameters entered in the Split Screen table)
without affecting the contents of its database memory.
2.2.2 P̲R̲O̲G̲R̲A̲M̲M̲E̲D̲ ̲U̲N̲I̲T̲ ̲w̲i̲t̲h̲ ̲c̲o̲r̲r̲e̲c̲t̲ ̲r̲e̲s̲p̲o̲n̲s̲e̲s̲ ̲(̲c̲o̲n̲t̲'̲d̲)̲
The Split key (located next to the RESET key) is used
splits to move the cursor between ...... . The cursor will
not move into an undefined or improperly defined split:
The topmost line of the screen is reserved as the
Status Status Line. The ...... Line is used to alert the operator
of specific operating modes and conditions. A message
on the left side of the Status Line applies to the
current split (i.e. where the cursor is currently located).
A message in the centre or right may apply to any or
all splits.
The terminal has a monitor mode which serves as a high-level
control point for the terminal system. The monitor
is accessed via the MON key which causes the
Monitor ....... menu to be displayed on the screen. The operator
may step through the items in the Monitor menu using
the RETURN, TAB or Cursor Movement keys.
The operator may key in commands to move, copy, delete
or insert text within the Text Memory. Segments of
text that are to be manipulated by a specific Text
Processing function must be defined by the operator
before the function can be executed.
defined Text segments that may be ....... include words, sentences,
paragraphs, blocks and lines.
The keyboard contains a special set of 36 Program
Program Function (P.F.) keys. Each of the ...... ........
Function keys is used to enter a string of user-programmed data
via a single keystroke.
Data entry operations that require entered data to
be constrained by a rigid screen format are performed
in
Format Format mode. In ...... mode, the operator keys data
into a user-created format displayed on the terminal's
screen, via a "fill-in-the-blanks" approach.
Control Display Control mode causes all ....... characters
and Shift Out sequences to be displayed on the screen
rather than being acted upon by the terminal. This
is useful for observing the content of information
received from the host computer as a maintenance aid.
THIS PAGE…01…IS …01…INTENTIONALLY LEFT BLANK
2.3 L̲I̲S̲T̲ ̲O̲F̲ ̲I̲M̲P̲O̲R̲T̲A̲N̲T̲ ̲T̲E̲R̲M̲S̲ ̲A̲N̲D̲ ̲C̲O̲N̲C̲E̲P̲T̲S̲
When you have completed units 2.1 and 2.2, read the
following:
VDU OPERATORS MANUAL, CPS/OPM/007, Section 1 (Introduction
to the 7260T Terminal) to Section 3 (Advanced Operations)
inclusive, and
VDU REFERENCE MANUAL,CPS/REM/001, Section 3.9 (Diagnostic
Testing).
̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲
Work through sub-unit 2.3.1 AFTER reading the appropriate
part of the VDU manuals, filling in as many gaps as
possible. The answers, which will establish some of
the key ideas and concepts presented in the manuals,
will be found at the following sub-unit (2.3.2).
2.3.1 L̲I̲S̲T̲ ̲O̲F̲ ̲I̲M̲P̲O̲R̲T̲A̲N̲T̲ ̲T̲E̲R̲M̲S̲ ̲A̲N̲D̲ ̲C̲O̲N̲C̲E̲P̲T̲S̲
The program that is used to control the basic
operations of the 7260T is called the ....... . It
is similar to the Executive program in some large computers.
The process of ............. aligns existing text so
that any word which extends into the right margin is
moved completely to the next line.
The currently applicable operating options or
parameters are displayed in the ...... Menu. The features
which may be varied by the operator include Auto Justificaton,
Word Wrap and Keyboard repeat rate.
The ......function clears the keyboard buffer and stops
any function currently in progress.
The process of ......... involves displacing a
line of text at one extreme of the display be entering
a new line at the opposite extreme.
The screen may be divided into separate areas, each
of which represents a separate portion of text memory.
These
areas are known as ...... and may be effectively regarded
as distinct databases which may be accessed individually
by the operator and the host computer.
A reserved portion of the terminal's memory called
the
....... ....... is used to supply the screen with information.
All text that is displayed is located in this area.
The standard set of codes used to represent
characters within the 7260T is called ...... .
The ...... indicates the location on the screen where
the next entry from the keyboard will appear. It may
be displayed in different ways depending on the operator's
preference.
2.3.1 L̲I̲S̲T̲ ̲O̲F̲ ̲I̲M̲P̲O̲R̲T̲A̲N̲T̲ ̲T̲E̲R̲M̲S̲ ̲A̲N̲D̲ ̲C̲O̲N̲C̲E̲P̲T̲S̲ ̲(̲c̲o̲n̲t̲'̲d̲)̲
The configuration parameters of the 7260T are
stored in a non-volatile memory called ..... .
This does not lose its information when power is removed.
When the terminal is in ...... mode, data may only
be entered or altered within specified areas of the
screen.
Program Function keys F13 to 36 are accessed via
the ....... keypad.
On power-up, the 7260T performs a read/write
memory test in RAM and a ........ test in EAROM. A
more extensive test may be invoked through the Monitor
menu.
2.3.2 L̲I̲S̲T̲ ̲O̲F̲ ̲I̲M̲P̲O̲R̲T̲A̲N̲T̲ ̲T̲E̲R̲M̲S̲ ̲A̲N̲D̲ ̲C̲O̲N̲C̲E̲P̲T̲S̲ ̲w̲i̲t̲h̲ ̲c̲o̲r̲r̲e̲c̲t̲ ̲r̲e̲s̲p̲o̲n̲s̲e̲s̲
The program that is used to control the basic
monitor operations of the 7260T is called the ....... . It
is similar to the Executive program in some large computers.
justifi- The process of ............. aligns existing text so
cation that any word which extends into the right margin is
moved completely to the next line.
The currently applicable operating options or
Option parameters are displayed in the ...... Menu. The features
which may be varied by the operator include Auto Justificaton,
Word Wrap and Keyboard repeat rate.
Reset The ......function clears the keyboard buffer and stops
any function currently in progress.
scrolling The process of ......... involves displacing a
line of text at one extreme of the display be entering
a new line at the opposite extreme.
The screen may be divided into separate areas, each
of which represents a separate portion of text memory.
These
splits areas are known as ...... and may be effectively regarded
as distinct databases which may be accessed individually
by the operator and the host computer.
A reserved portion of the terminal's memory called
the
display ....... ....... is used to supply the screen with
memory information. All text that is displayed is located
in this area.
The standard set of codes used to represent
ASCII characters within the 7260T is called ...... .
cursor The ...... indicates the location on the screen where
the next entry from the keyboard will appear. It may
be displayed in different ways depending on the operator's
preference.
2.3.2 L̲I̲S̲T̲ ̲O̲F̲ ̲I̲M̲P̲O̲R̲T̲A̲N̲T̲ ̲T̲E̲R̲M̲S̲ ̲A̲N̲D̲ ̲C̲O̲N̲C̲E̲P̲T̲S̲ ̲w̲i̲t̲h̲ ̲c̲o̲r̲r̲e̲c̲t̲ ̲r̲e̲s̲p̲o̲n̲s̲e̲s̲
̲(̲c̲o̲n̲t̲'̲d̲)̲
The configuration parameters of the 7260T are
EAROM stored in a non-volatile memory called ..... .
This does not lose its information when power is removed.
Format When the terminal is in ...... mode, data may only
be entered or altered within specified areas of the
screen.
Program Function keys F13 to 36 are accessed via
numeric the ....... keypad.
On power-up, the 7260T performs a read/write
checksum memory test in RAM and a ........ test in EAROM. A
more extensive test may be invoked through the Monitor
menu.
2.4 M̲U̲L̲T̲I̲P̲L̲E̲ ̲C̲H̲O̲I̲C̲E̲ ̲S̲E̲L̲F̲-̲Q̲U̲I̲Z̲
You may refer to the VDU Manuals when answering these
questions, although you should not spend too long on
any one problem. The correct answers are given in unit
2.5. Remember that speed is important as accurracy
in evaluating how well you have understood the material
presented to you.
1. The Word Wrap feature in the Options menu has the
following effect:
a) if a word which is currently being entered
extends into the right-hand margin of the split,
the entire word is moved to the next line.
b) at the completion of Change, Move, Copy, and
Delete Word or Char operations, as well as
on leaving Insert mode, the existing text is
justified with respect to the right-hand margin
and the left side of the split.
c) both of the above.
2. The Clear Memory feature in the Options menu has
the following effect:
a) deletes all data in the current split.
b) deletes all data from the current cursor position
to the end of the split.
c) deletes all text in the memory, regardless
of split boundaries.
3. To alter the split screen parameters when the terminal
has been powered up, the operator should call up:
a) the Status display.
b) the Option menu.
c) the Monitor menu.
THIS PAGE…01…IS…01…INTENTIONALLY LEFT BLANK
2.4 M̲U̲L̲T̲I̲P̲L̲E̲ ̲C̲H̲O̲I̲C̲E̲ ̲S̲E̲L̲F̲ ̲Q̲U̲I̲Z̲ (cont'd)
4. The terminal RAM tests, which are invoked using
the Diagnostic menu, run for:
a) approx. 20 seconds
b) several minutes.
c) continuously.
5. The I/O test puts each UART into internal loop-back
mode, and causes data to be transmitted and received
at:
a) 110 baud.
b) 2400 baud.
c) 9600 baud.
6. To backspace the cursor when defining a P.F. key,
the operator should:
a) press the P.F. key being defined.
b) press the NEG key.
c) press CNTL/NEG.
7. In non-Format mode, the Clear ALL function deletes:
a) all data in the current split.
b) all data in the database, regardless of split
boundaries.
c) all data from the cursor position to the end
of the split.
2.4 M̲U̲L̲T̲I̲P̲L̲E̲ ̲C̲H̲O̲I̲C̲E̲ ̲S̲E̲L̲F̲ ̲Q̲U̲I̲Z̲ (cont'd)
8. Which of the following does not conform to the
definition of a sentence, as used by the text processing
functions:
a) The host computer.
b) The host computer?
c) The host computer:
9. Which of the following functions is disabled in
Display Control mode:
a) Reset
b) Cursor Down
c) Clear All
10. When the keyboard has been disabled by the host,
which of the following keys remains active:
a) STAT
b) MON
c) ESC
2.5 M̲U̲L̲T̲I̲P̲L̲E̲ ̲C̲H̲O̲I̲C̲E̲ ̲S̲E̲L̲F̲ ̲Q̲U̲I̲Z̲ ̲A̲N̲S̲W̲E̲R̲
Q̲U̲E̲S̲T̲I̲O̲N̲ C̲O̲R̲R̲E̲C̲T̲ ̲A̲N̲S̲W̲E̲R̲
1. a.
2. c.
3. c.
4. b.
5. c.
6. b.
7. a.
8. b.
9. c.
10. b.
2.6 S̲A̲M̲P̲L̲E̲ ̲T̲R̲O̲U̲B̲L̲E̲S̲H̲O̲O̲T̲I̲N̲G̲
Whenever text is being inserted into a paragraph which
is fully indented from the left-hand side of the screen,
the general format of the paragraph is destroyed, and
each line is repositioned to start in column 0 of the
split.
What is the most likely cause of this, and how can
it be avoided?
̲ ̲ ̲ ̲ ̲
Solution in Appendix A.
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3 P̲R̲I̲N̲T̲ ̲A̲N̲D̲ ̲C̲O̲M̲M̲U̲N̲I̲C̲A̲T̲I̲O̲N̲S̲ ̲F̲A̲C̲I̲L̲I̲T̲I̲E̲S̲
To be used in conjunction with VDU OPERATORS MANUAL,
CPS/OPM/007, Section 4 (The Configuration Menu), and
VDU REFERENCE MANUAL, CPS/REM/001, Section 2.3.4 (Printer)
and Section 3.10 (Printer). All references to the "Local
Host" or Disk functions should be disregarded.
3.1 L̲E̲A̲R̲N̲I̲N̲G̲ ̲O̲B̲J̲E̲C̲T̲I̲V̲E̲S̲
This section is intended to introduce you to the Print
and Communications facilities available from the terminal.
After reading it you should be able to perform the
following operations:
Set up the terminal's Print characteristics.
Achieve communication with a local printer.
Set up the terminal's Communication characteristics.
Achieve communication with the host in TTY mode.
Achieve communication with the host in Buffered TTY
mode.
Achieve communication with the host in Block mode.
A restricted password is used to protect the values
stored in the Configuration Menu against interference
by unauthorized personnel. The password is CONF, and
should be input (in Capitals) when requested by the
Configuration menu. It must be stressed that this password
is used to protect the system from possible misuse,
and under no circumstances should it be divulged to
unauthorized personnel.
3.2 P̲R̲O̲G̲R̲A̲M̲M̲E̲D̲ ̲U̲N̲I̲T̲
Work through sub-unit 3.2.1 BEFORE reading the appropriate
part of the VDU Manuals, filling in as many gaps as
possible.
The answers, which will establish some of the key ideas
and concepts presented in the manuals, will be found
at the following sub-unit (3.2.2).
THIS PAGE…01…IS…01…INTENTIONALLY LEFT BLANK
3.2.1 P̲R̲O̲G̲R̲A̲M̲M̲E̲D̲ ̲U̲N̲I̲T̲
The 7260T is equipped with an EIA Standard RS-232C
interface port to accommodate a local ........ This
can be shared by as many as six 7260T terminals, and
printed copy is produced under control of operator
or host initiated commands.
The host computer can access the printer directly,
without affecting the terminal memory or the display
screen, via Print Direct mode. ..... ...... mode is
selected by the host computer.
When the terminal is in Print Direct mode, all data
and ....... characters received from the host are sent
to
printer without affecting the screen.
The 7260T can communicate with the .... computer using
several different methods. Either TTY or buffered TTY
(BTTY) may be selected by the operator for communication
with the host, and in addition the host can select
Block mode.
In TTY mode, every character is sent to the host as
it is typed. The characters sent are normally displayed
after the host echoes them back. In .... mode the characters
entered are not sent until the ENTER key is pressed.
This permits commands to be changed before they are
sent.
If the host computer initiates Block mode, exchange
of data with the terminal is governed by a special
protocol. The ..... key still signals the transmission
of data.
3.2.2 P̲R̲O̲G̲R̲A̲M̲M̲E̲D̲ ̲U̲N̲I̲T̲ ̲w̲i̲t̲h̲ ̲c̲o̲r̲r̲e̲c̲t̲ ̲r̲e̲s̲p̲o̲n̲s̲e̲s̲
The 7260T is equipped with an EIA Standard RS-232C
interface port to accommodate a local ........ This
printer can be shared by as many as six 7260T terminals, and
printed copy is produced under control of operator
or host initiated commands.
The host computer can access the printer directly,
without affecting the terminal memory or the display
Print screen, via Print Direct mode. ..... ...... mode is
Direct selected by the host computer.
When the terminal is in Print Direct mode, all data
and ....... characters received from the host are sent
to
Control printer without affecting the screen.
host The 7260T can communicate with the .... computer using
several different methods. Either TTY or buffered TTY
(BTTY) may be selected by the operator for communication
with the host, and in addition the host can select
Block mode.
In TTY mode, every character is sent to the host as
it is typed. The characters sent are normally displayed
BTTY after the host echoes them back. In .... mode the characters
entered are not sent until the ENTER key is pressed.
This permits commands to be changed before they are
sent.
If the host computer initiates Block mode, exchange
of data with the terminal is governed by a special
ENTER protocol. The ..... key still signals the transmission
of data.
3.3 L̲I̲S̲T̲ ̲O̲F̲ ̲I̲M̲P̲O̲R̲T̲A̲N̲T̲ ̲T̲E̲R̲M̲S̲ ̲A̲N̲D̲ ̲C̲O̲N̲C̲E̲P̲T̲S̲
When you have completed units 3.1 and 3.2, read the
following:
VDU OPERATORS MANUAL, CPS/OPM/007, Section 4 (The Configuration
Menu), and
VDU REFERENCE MANUAL, CPS/REM/001, Section 2.3.4 (Printer)
and Section 3.10 (Printer).
̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲
Work through sub-unit 3.3.1 AFTER reading the appropriate
part of the VDU Manuals, filling in as many gaps as
possible. The answers, which will establish some of
the key ideas and concepts presented in the manuals,
will be found at the following sub-unit (3.3.2).
THIS PAGE…01…IS…01…INTENTIONALLY LEFT BLANK
3.3.1 L̲I̲S̲T̲ ̲O̲F̲ ̲I̲M̲P̲O̲R̲T̲A̲N̲T̲ ̲T̲E̲R̲M̲S̲ ̲A̲N̲D̲ ̲C̲O̲N̲C̲E̲P̲T̲S̲ ̲
The 7260T communicates with a local printer via
.... .., a serial interface whose data transmission
parameters are specified in the terminal's Configuration
menu.
The Print Segment function causes all data in the
........... areas to be printed.
The Print Buffer, whose size may be selected via the
Configuration menu, is allocated from the .... memory
area.
The 7260T communicates with the .... ........ via
Port 1, the communications port.
The set of rules governing the exchange of data between
the host computer and the terminal is called ........
.
In TTY mode, characters are transmitted to the host
as they are typed by the operator. However, the codes
corresponding to the function keys and display-oriented
Control keys are only transmitted if the .... .. ...
option has been selected in the Configuration menu.
In Buffered TTY mode, nothing is transmitted by the
terminal until the operator presses the ..... key or
the host issues a Transmit command to the terminal.
Transmission in Block mode is controlled by the host
computer, which solicits specialized terminal
transmissions via .... commands.
If "N" is entered against the DEL/BS option in the
Configuration menu, a ...... character is sent to the
host when the DEL key is pressed in TTY mode.
3.3.2 L̲I̲S̲T̲ ̲O̲F̲ ̲I̲M̲P̲O̲R̲T̲A̲N̲T̲ ̲T̲E̲R̲M̲S̲ ̲A̲N̲D̲ ̲C̲O̲N̲C̲E̲P̲T̲S̲ ̲w̲i̲t̲h̲ ̲c̲o̲r̲r̲e̲c̲t̲ ̲a̲n̲s̲w̲e̲r̲s̲
The 7260T communicates with a local printer via
Port 2 .... .., a serial interface whose data transmission
parameters are specified in the terminal's Configuration
menu.
The Print Segment function causes all data in the
high- ........... areas to be printed.
lighted
The Print Buffer, whose size may be selected via the
text Configuration menu, is allocated from the .... memory
area.
host The 7260T communicates with the .... ........ via
computer Port 1, the communications port.
The set of rules governing the exchange of data between
protocol the host computer and the terminal is called ........
.
In TTY mode, characters are transmitted to the host
as they are typed by the operator. However, the codes
corresponding to the function keys and display-oriented
XMIT SO Control keys are only transmitted if the .... .. ...
SEQ option has been selected in the Configuration menu.
In Buffered TTY mode, nothing is transmitted by the
ENTER terminal until the operator presses the ..... key or
the host issues a Transmit command to the terminal.
Transmission in Block mode is controlled by the host
computer, which solicits specialized terminal
ARM transmissions via .... commands.
If "N" is entered against the DEL/BS option in the
Delete Configuration menu, a ...... character is sent to the
host when the DEL key is pressed in TTY mode.
3.4 M̲U̲L̲T̲I̲P̲L̲E̲ ̲C̲H̲O̲I̲C̲E̲ ̲S̲E̲L̲F̲ ̲Q̲U̲I̲Z̲
You may refer to the VDU Manuals when answering these
questions, although you should not spend too long on
any one problem. The correct answers are given in unit
3.5. Remember that speed is as important as accuracy
in evaluating how well you have understood the material
presented to you.
1. In TTY mode, if the terminal responds to a Print
Direct command from the host with an ASCII "D"
followed by "N", this indicates that:
a) the terminal is in "DISABLE REMOTE" mode.
b) the printer is in use locally.
c) the printer is not connected.
2. If a Print Segment command is issued when no highlighted
data is present:
a) no action is taken.
b) the data between the SOM and EOM is printed.
c) the data between the SOM and the current cursor
position is printed.
3. The default communications mode of the 7260T is:
a) TTY mode.
b) buffered TTY mode.
c) Block mode.
4. In buffered TTY mode, if data is present (but not
highlighted) in the current split, the ENTER key
initiates:
a) transmission of an XOFF character only.
b) transmission of the text located between the
Start of Memory and the current cursor position.
c) transmission of the text located between the
Start of Memory and the End of Memory (or End
of Split).
3.4 M̲U̲L̲T̲I̲P̲L̲E̲ ̲C̲H̲O̲I̲C̲E̲ ̲S̲E̲L̲F̲ ̲Q̲U̲I̲Z̲ (cont'd)
5. If the terminal is in Block mode, it is only able
to transmit data to the host computer:
a) after receiving kan ARM command from the host.
b) when it is in the STX RECEIVED state.
c) when it is in the ACK WAIT state.
6. If the terminal is in Block mode, a W character
in column 80 of the Status line signifies:
a) the terminal is in READ WAIT state.
b) the terminal is in ACK WAIT state
c) the terminal is in BUFFER WAIT state.
7. If the terminal is in TTY ECHO mode, alphanumeric
characters input from the keyboard will only be
displayed:
a) when they have been returned by the host.
b) if the SMIT SO SEQ option has been selected
from the menu.
c) both of the above.
8. The minimum Baud rate available for data transmission
is:
a) 55 Baud.
b) 110 Baud.
c) 150 Baud.
9. If the Configuration menu option Print LF after
CR is set to "Y":
a) Each line of text sent to the printer will
be followed by CR/LF.
b) Each line of text sent to the printer will
be followed by CR only.
c) The terminal will display LF characters at
the end of each line.
3.4 M̲U̲L̲T̲I̲P̲L̲E̲ ̲C̲H̲O̲I̲C̲E̲ ̲S̲E̲L̲F̲ ̲Q̲U̲I̲Z̲ (cont'd)
10. If the Configuration menu option PGM EAROM is set
to "N":
a) Any newly-entered Configuration parameters
will be stored in non-volatile memory, and
will govern the operation of the terminal until
they are changed again.
b) Any newly-entered Configuration parameters
will be stored in volatile memory, and will
govern the operation of the terminal until
they are changed again, or until the terminal
is powered down.
c) Any newly-entered Configuration parameters
will be stored in write-only memory, and will
not affect the operation of the terminal.
3.5 M̲U̲L̲T̲I̲P̲L̲E̲ ̲C̲H̲O̲I̲C̲E̲ ̲S̲E̲L̲F̲ ̲Q̲U̲I̲Z̲ ̲A̲N̲S̲W̲E̲R̲
Q̲U̲E̲S̲T̲I̲O̲N̲ C̲O̲R̲R̲E̲C̲T̲ ̲A̲N̲S̲W̲E̲R̲
1 b
2 b
3 a
4 c
5 a
6 c
7 a
8 b
9 a
10 b
3.6 S̲A̲M̲P̲L̲E̲ ̲T̲R̲O̲U̲B̲L̲E̲S̲H̲O̲O̲T̲I̲N̲G̲
Reported problem: each time a key is pressed, the required
character appears twice on the screen. The terminal
is in TTY mode and connected to a host computer.
What is the most likely cause of the problem?
̲ ̲ ̲ ̲ ̲
Solution in Appendix A.
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4 L̲E̲V̲E̲L̲ ̲R̲E̲P̲A̲I̲R̲ ̲
To be used in conjunction with VDU MAINTENANCE MANUAL
VOL. I, CPS/TCM/006, Section 1 (System Overview), Section
3 (Maintenance and Alignment) and Appendix A (Board-level
troubleshooting flow-chart).
4.1 L̲E̲A̲R̲N̲I̲N̲G̲ ̲O̲B̲J̲E̲C̲T̲I̲V̲E̲S̲
This section is intended to aid you in isolating terminal
faults to the module (board) level. After reading it
you should be able to perform the following operations:
Check Power Supply Voltages.
Diagnose Display faults (including error messages arising
from the terminal diagnostic routines).
Diagnose Keyboard faults.
Align the Video Display.
4.2 P̲R̲O̲G̲R̲A̲M̲M̲E̲D̲ ̲U̲N̲I̲T̲
Work through sub-unit 4.2.1 BEFORE reading the appropriate
part of the VDU Manuals, filling in as many gaps as
possible. The answers, which will establish some of
the key ideas and concepts presented in the manuals,
will be found at the following sub-unit (4.2.2).
4.2.1 P̲R̲O̲G̲R̲A̲M̲M̲E̲D̲ ̲U̲N̲I̲T̲
The CPU subsystem is responsible for coordinating and
controlling all system functions and interactions
(except the display subsystem). The heart of the ...
subsystem is a sixteen-bit microprocessor, the TMS
9900.
The CPU communicates with the other system elements
over one of three basic ... structures, dependent on
the type of operation to be performed. The first of
these bus structures is the address bus.
The 9900 generates internally a sixteen-bit address,
of
which the fifteen most significant .... , A0 through
A14, are bought out to form a fifteen-bit wide address
bus.
The fifteen-bit address bus allows the 9900 to
address 32,768 unique locations in ...... The address
bus is unidirectional, emanating from the microprocessor.
The second major bus structure is a sixteen bit wide,
bi-directional data bus. A data word may be considered
as either a single sixteen bit word or as two ......
bit bytes.
If the program dictates a byte operation, the LSB of
the address, A15 (which is generated but not bussed),
will determine whether the high-order byte, D0-D7,
or
the ... ..... byte, D8-D15 will be affected.
The address bus and data bus are both used for
communication between the CPU and the ......
These communication paths are parallel.
Communication between the CPU and the I/O subsystem
is conducted serially. As far as the CPU is concerned,
the ... subsystem consists of 4096 single-bit memory
locations known as the CRU (Communications Register
Unit).
4.2.1 P̲R̲O̲G̲R̲A̲M̲M̲E̲D̲ ̲U̲N̲I̲T̲ (cont'd)
The 9900 can directly address 32,768 words of
...... In the 7260T terminal, this address space is
completely populated, and is segmented into eight blocks
of 4K.
The first four blocks, from hex address 0000 to 7FFE
contain volatile random access read/write memory (RAM).
This area, being ........, is used for storage of data,
screen memory and (in the first 654 words) the interrupt
and XOP trap vectors.
The second four blocks contain non-volatile, erasable
programmable read-only memory (EPROM). This are, which
is located from hex address .... to FFFE, is used for
storing the terminal's operational program, diagnostics
and the power-on boot program.
An Electrically Alterable Read Only Memory (EAROM)
is
used for ....... system configuration information such
as device addresses, port set-up parameters and keyboard
function selections.
The EAROM is a non-volatile device, and has a capacity
of 1400 bits, organised as one hundred 14-bit words.
It
is ........ via CRU functions and therefore does not
reside in main memory space.
All I/O communication in the 7260T is accomplished
via one of the CRU operations. CRU space is addressed
over
the same 15-bit ....... bus used to access memory.
To distinguish between ... addresses and main memory
addresses, the 9900 utilises a separate control signal
MEMEN(L), (memory enable, active low).
When MEMEN(L) is active, the address currently on the
address bus is identified as a ...... location. When
MEMEN(L) is inactive, a CRU operation is indicated.
The video dispslay electronics are designed to support
a TV-like raster scan (non-interlaced). To satisfy
the stringent horizontal and vertical synchronisation
requirements of this type of display, the subsystem
utilises its own crystal controlled ..... .
4.2.1 P̲R̲O̲G̲R̲A̲M̲M̲E̲D̲ ̲U̲N̲I̲T̲ (cont'd)
The terminal screen can display 28 lines of 80 characters
each. The information displayed on the screen is retrieved
from a dedicated portion of general
...... , known as Display Memory.
Each displayable character position is represented
by
one word in the ....... Memory. The sixteen words immediately
preceding the Display Memory proper are cursor registers.
For each word within the Display Memory, the seven
low order bits of the high order byte contain the USASCII
code for the character to be ......... .
The character code forms the address presented to the
......... generator EPROM. The output of the character
generator is the dot pattern required for the current
raster line.
The high order byte of each word in display memory
contains the information necessary for the
.......... of video attributes.
4.2.2 P̲R̲O̲G̲R̲A̲M̲M̲E̲D̲ ̲U̲N̲I̲T̲ ̲w̲i̲t̲h̲ ̲c̲o̲r̲r̲e̲c̲t̲ ̲a̲n̲s̲w̲e̲r̲s̲
The CPU subsystem is responsible for coordinating and
controlling all system functions and interactions
CPU (except the display subsystem). The heart of the ...
subsystem is a sixteen-bit microprocessor, the TMS
9900.
The CPU communicates with the other system elements
bus over one of three basic ... structures, dependent on
the type of operation to be performed. The first of
these bus structures is the address bus.
The 9900 generates internally a sixteen-bit address,
of
bits which the fifteen most significant .... , A0 through
A14, are bought out to form a fifteen-bit wide address
bus.
The fifteen-bit address bus allows the 9900 to
memory address 32,768 unique locations in ...... The address
bus is unidirectional, emanating from the microprocessor.
The second major bus structure is a sixteen bit wide,
bi-directional data bus. A data word may be considered
eight as either a single sixteen bit word or as two ......
bit bytes.
If the program dictates a byte operation, the LSB of
the address, A15 (which is generated but not bussed),
will determine whether the high-order byte, D0-D7,
or
low-order the ... ..... byte, D8-D15 will be affected.
The address bus and data bus are both used for
memory communication between the CPU and the ......
These communication paths are parallel.
Communication between the CPU and the I/O subsystem
is conducted serially. As far as the CPU is concerned,
I/O the ... subsystem consists of 4096 single-bit memory
locations known as the CRU (Communications Register
Unit).
4.2.2 P̲R̲O̲G̲R̲A̲M̲M̲E̲D̲ ̲U̲N̲I̲T̲ ̲w̲i̲t̲h̲ ̲c̲o̲r̲r̲e̲c̲t̲ ̲a̲n̲s̲w̲e̲r̲s̲ ̲(cont'd)
The 9900 can directly address 32,768 words of
memory ...... In the 7260T terminal, this address space is
completely populated, and is segmented into eight blocks
of 4K.
The first four blocks, from hex address 0000 to 7FFE
contain volatile random access read/write memory (RAM).
volatile This area, being ........, is used for storage of data,
screen memory and (in the first 654 words) the interrupt
and XOP trap vectors.
The second four blocks contain non-volatile, erasable
programmable read-only memory (EPROM). This are, which
8000 is located from hex address .... to FFFE, is used for
storing the terminal's operational program, diagnostics
and the power-on boot program.
An Electrically Alterable Read Only Memory (EAROM)
is
storing used for ....... system configuration information such
as device addresses, port set-up parameters and keyboard
function selections.
The EAROM is a non-volatile device, and has a capacity
of 1400 bits, organised as one hundred 14-bit words.
It
accessed is ........ via CRU functions and therefore does not
reside in main memory space.
All I/O communication in the 7260T is accomplished
via one of the CRU operations. CRU space is addressed
over
address the same 15-bit ....... bus used to access memory.
CRU To distinguish between ... addresses and main memory
addresses, the 9900 utilises a separate control signal
MEMEN(L), (memory enable, active low).
When MEMEN(L) is active, the address currently on the
memory address bus is identified as a ...... location. When
MEMEN(L) is inactive, a CRU operation is indicated.
The video dispslay electronics are designed to support
a TV-like raster scan (non-interlaced). To satisfy
the stringent horizontal and vertical synchronisation
requirements of this type of display, the subsystem
clock utilises its own crystal controlled ..... .
4.2.2 P̲R̲O̲G̲R̲A̲M̲M̲E̲D̲ ̲U̲N̲I̲T̲ ̲w̲i̲t̲h̲ ̲c̲o̲r̲r̲e̲c̲t̲ ̲a̲n̲s̲w̲e̲r̲s̲ ̲(cont'd)
The terminal screen can display 28 lines of 80 characters
each. The information displayed on the screen is retrieved
from a dedicated portion of general
memory ...... , known as Display Memory.
Each displayable character position is represented
by
Display one word in the ....... Memory. The sixteen words immediately
preceding the Display Memory proper are cursor registers.
For each word within the Display Memory, the seven
low order bits of the high order byte contain the USASCII
displayed code for the character to be ......... .
The character code forms the address presented to the
character ......... generator EPROM. The output of the character
generator is the dot pattern required for the current
raster line.
The high order byte of each word in display memory
contains the information necessary for the
generation .......... of video attributes.
4.3 L̲I̲S̲T̲ ̲O̲F̲ ̲I̲M̲P̲O̲R̲T̲A̲N̲T̲ ̲T̲E̲R̲M̲S̲ ̲A̲N̲D̲ ̲C̲O̲N̲C̲E̲P̲T̲S̲
When you have completed units 4.1 and 4.2, read the
following:
VDU MAINTENANCE MANUAL VOL. I, CPS/TCM/006, Section
1 (System Overview), Section 3 (Maintenance and Alignment)
and Appendix A (Board-level troubleshooting flow-chort).
Appendices C and D of this Self-Teach package give
the necessary information to interpret error messages
arising from faulty RAM and EPROM chips, and must be
studied as part of this section.
̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲
Work through sub-unit 4.3.1 AFTER reading the appropriate
part of the VDU Manuals, filling in as many gaps as
possible. The answers, which will establish some of
the key ideas and concepts presented in the manuals,
will be found at the following sub-unit (4.3.2).
4.3.1 L̲I̲S̲T̲ ̲O̲F̲ ̲I̲M̲P̲O̲R̲T̲A̲N̲T̲ ̲T̲E̲R̲M̲S̲ ̲A̲N̲D̲ ̲C̲O̲N̲C̲E̲P̲T̲S̲
The card frame in the 7260T terminal can accomodate
up to six cards. A minimal configuration will in fact
contain three cards: the Processor Memory Module (PMM),
the Dispslay Memory Module (DMM) and the ... module.
The PMM contains the ...... subsystem, part of the
memory subsystem and part of the I/O subsystem.
The 7260T power supply is a two-stage switching
regulator using a saturating reactor ........ .
Faults in the display subsystem fall intos two broad
categories: error messages displayed by the terminal's
diagnostic programs, and problems with the ......
.
Two major electronic sub-assemblies affect the operation
of the keyboard: the keyboard logic card, which is
mounted in the detachable keyboard assembly,
and the ........ .
The video display must be re-aligned if the CRT
control module, the ..... assembly or the CRT itself
is changed, or if the display image is distorted.
The CPU communicates with other system elements over
one of three basic bus structures: the address bus,
the data bus and the ....... bus, dependent on the
operation to be performed.
As far as the CPU is concerned, the I/O subsystem con-
sists of .... single bit locations, known as the Communications
Register Unit (CRU). The CPU communicates serially
with the CRU via the CRU bus. Using this bus the CPU
can set, reset or test any bit at any location in CRU
space.
CRU space is addressed over the same fifteen bit address
bus used to access memory. To distinguish between CRU
addresses and main memory addresses, the
9900 utilizes a separate control signal, ........
.
When this signal is active, the address currently on
the address bus refers to a memory location, as opposed
to a CRU address.
4.3.1 L̲I̲S̲T̲ ̲O̲F̲ ̲I̲M̲P̲O̲R̲T̲A̲N̲T̲ ̲T̲E̲R̲M̲S̲ ̲A̲N̲D̲ ̲C̲O̲N̲C̲E̲P̲T̲S̲ (cont'd)
The first four blocks of the memory subsystem, from
Hex addresses 0000 to 7FFE utilize dynamic random access,
read/write memory (RAM). The second four blocks, from
hex addresses 8000 to .... , are occupied by non-volatile
Erasable Programmable Read Only Memory (EPROM).
The ..... is used for storing system configuration
information such as device addresses, port set-up parameters,
and keyboard function selections. This memory device
is accessed via CRU operations and therefore does not
reside in main memory space.
Display memory occupies memory locations 00A0 to 121E
Hex in the 7260T. Each character location on the screen
is allotted 1 word (16 bits) of display memory. The
low order byte of each word contains the information
necessary for the generation of ..... .......... .
The
seven low order bits of the high order byte contain
the
USASCII code for the characer to be displayed. The
eight bit is reserved for use by terminals with the
capability of generating an extended character set.
With the exception of pins .. and .. , the first 116
pin positions of the backplane are parallel wired,
i.e. identical at each card slot. The non-parallel
pins are used for daisy chaining DMA grants. Non-DMA
cards must have these two pins jumpered together.
A TMS 9900 microprocessor is used as the CPU in the
7260T. This chip requires three regulated DC voltages
plus ground for operation; Vcc= ..V, Vdd= ..V and Vbb=
..V .
The printed wiring board holding the CRT control electronics
is mounted on the side of CRT mounting enclosure. The
CRT control electronics consist of three independent
circuits; the video amplifier circuit,
........ ........... circuit and the horizontal de-
flection/high voltage supply circuit.
The keyboard logic card is mounted in the ........
assembly. When the keyboard behaves erratically, sometimes
repeating characters, sometimes displaying the wrong
ones, or generally showing an intermittent
problem, the keyswitches should be ....... .
4.3.2 L̲I̲S̲T̲ ̲O̲F̲ ̲I̲M̲P̲O̲R̲T̲A̲N̲T̲ ̲T̲E̲R̲M̲S̲ ̲A̲N̲D̲ ̲C̲O̲N̲C̲E̲P̲T̲S̲ ̲w̲i̲t̲h̲ ̲c̲o̲r̲r̲e̲c̲t̲ ̲a̲n̲s̲w̲e̲r̲s̲
The card frame in the 7260T terminal can accomodate
up to six cards. A minimal configuration will in fact
contain three cards: the Processor Memory Module (PMM),
I/O the Dispslay Memory Module (DMM) and the ... module.
CPU The PMM contains the ...... subsystem, part of the
memory subsystem and part of the I/O subsystem.
The 7260T power supply is a two-stage switching
invertor regulator using a saturating reactor ........ .
Faults in the display subsystem fall intos two broad
categories: error messages displayed by the terminal's
raster diagnostic programs, and problems with the ...... .
Two major electronic sub-assemblies affect the operation
of the keyboard: the keyboard logic card, which is
mounted in the detachable keyboard assembly,
IOM and the ........ .
The video display must be re-aligned if the CRT
yoke control module, the ..... assembly or the CRT itself
is changed, or if the display image is distorted.
The CPU communicates with other system elements over
one of three basic bus structures: the address bus,
CRU the data bus and the ....... bus, dependent on the
operation to be performed.
As far as the CPU is concerned, the I/O subsystem con-
4096 sists of .... single bit locations, known as the Communications
Register Unit (CRU). The CPU communicates serially
with the CRU via the CRU bus. Using this bus the CPU
can set, reset or test any bit at any location in CRU
space.
CRU space is addressed over the same fifteen bit address
bus used to access memory. To distinguish between CRU
addresses and main memory addresses, the
MEMEN(L) 9900 utilizes a separate control signal, ........
.
When this signal is active, the address currently on
the address bus refers to a memory location, as opposed
to a CRU address.
4.3.2 L̲I̲S̲T̲ ̲O̲F̲ ̲I̲M̲P̲O̲R̲T̲A̲N̲T̲ ̲T̲E̲R̲M̲S̲ ̲A̲N̲D̲ ̲C̲O̲N̲C̲E̲P̲T̲S̲ ̲w̲i̲t̲h̲ ̲c̲o̲r̲r̲e̲c̲t̲ ̲a̲n̲s̲w̲e̲r̲s̲
̲(̲c̲o̲n̲t̲'̲d̲)
The first four blocks of the memory subsystem, from
Hex addresses 0000 to 7FFE utilize dynamic random access,
read/write memory (RAM). The second four blocks, from
FFFE hex addresses 8000 to .... , are occupied by non-volatile
Erasable Programmable Read Only Memory (EPROM).
EAROM The ..... is used for storing system configuration
information such as device addresses, port set-up parameters,
and keyboard function selections. This memory device
is accessed via CRU operations and therefore does not
reside in main memory space.
Display memory occupies memory locations 00A0 to 121E
Hex in the 7260T. Each character location on the screen
is allotted 1 word (16 bits) of display memory. The
low order byte of each word contains the information
video necessary for the generation of ..... .......... .
The
attribu- seven low order bits of the high order byte contain
the
tes USASCII code for the characer to be displayed. The
eight bit is reserved for use by terminals with the
capability of generating an extended character set.
7 and 8 With the exception of pins .. and .. , the first 116
pin positions of the backplane are parallel wired,
i.e. identical at each card slot. The non-parallel
pins are used for daisy chaining DMA grants. Non-DMA
cards must have these two pins jumpered together.
A TMS 9900 microprocessor is used as the CPU in the
7260T. This chip requires three regulated DC voltages
+5V plus ground for operation; Vcc= ..V, Vdd= ..V and Vbb=
+12V and ..V .
-5V.
The printed wiring board holding the CRT control electronics
is mounted on the side of CRT mounting enclosure. The
CRT control electronics consist of three independent
circuits; the video amplifier circuit,
vertical ........ ........... circuit and the horizontal de-
deflection flection/high voltage supply circuit.
keyboard The keyboard logic card is mounted in the ........
assembly. When the keyboard behaves erratically, sometimes
repeating characters, sometimes displaying the wrong
ones, or generally showing an intermittent
cleaned problem, the keyswitches should be ....... .…86…1
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4.4 M̲U̲L̲T̲I̲P̲L̲E̲ ̲C̲H̲O̲I̲C̲E̲ ̲S̲E̲L̲F̲ ̲Q̲U̲I̲Z̲
You may refer to the text when answering these questions,
although you should not spend too long on any one problem.
The correct answers are given in unit 4.5. Remember
that speed is as important as accuracy in evaluating
how well you have understood the material presented
to you.
1. Power has been applied to the terminal and the
fan is operating, but there is no output voltage
from the power supply. Should you:
a. determine whether or not the protection circuitry
is operational.
b. check the fuse and replace as necessary.
c. replace the power supply.
2. The voltages at the test points are ALL too low.
* Should you:
a. check the line voltage.
b. check Q20, CR22, CR23, CR4, Q11, Q12, Q8 and
CR13.
c. adjust potentiometer R62.
3. The ripple on the 5.2 V output is 70 mV p-p. Is
this:
a. acceptable.
b. too high.
c. suspiciously low.
4. There is a bright spot in the centre of the screen,
but not a full raster. Should you:
a. check for EHT (15KV) at the anode of the CRT.
b. check the CRT control electronics, the DMM
and the yoke.
c. check the Contract and Brightness controls.
* VDU MAINTENANCE MANUAL, CPS/TCM/006, Figure 3-1,
page 3-4.
4.4 M̲U̲L̲T̲I̲P̲L̲E̲ ̲C̲H̲O̲I̲C̲E̲ ̲S̲E̲L̲F̲ ̲Q̲U̲I̲Z̲ (cont'd)
5. The tube displays a full raster, but it rolls.
Should you:
a. check the CRT yoke.
b. check the mains frequency.
c. check the CRT control electronics and the DMM.
6. The following message is displayed:
MEM ERROR: ADR 7ABC 5A 1A
Which RAM chip is apparently defective:
a. ZD7A
b. ZC7
c. ZE7
7. The following message is displayed, along with
the diagnostic menu:
BAD EPROM CHECKSUM D001
Which PROM chip is apparently defective:
a. ZH2
b. ZH1
c. ZJ2
8. The character display is extending into the raster
edge on the right-hand side of the screen. To shift
the display left by one character position should
you:
a. adjust the size coil, L3.
b. move the shorting clip on the centering control
to the next (higher numbered) pin.
c. move the shorting clip on the centering control
to the previous (lower numbered) pin.
4.4 M̲U̲L̲T̲I̲P̲L̲E̲ ̲C̲H̲O̲I̲C̲E̲ ̲S̲E̲L̲F̲ ̲Q̲U̲I̲Z̲ (cont'd)
9. The characters on the top and bottom rows of the
display are smaller than those on the middle rows.
Should you:
a. adjust R23.
b. adjust R20.
c. adjust R18
10. The top and bottom rows of the display are wider
than the middle rows. Should you:
a. adjust the size coil, L3.
b. adjust the pincushion magnets as necessary.
c. move the shorting clip on the centering control
to the previous (lower numbered) pin.
4.5 M̲U̲L̲T̲I̲P̲L̲E̲ ̲C̲H̲O̲I̲C̲E̲ ̲S̲E̲L̲F̲ ̲Q̲U̲I̲Z̲ ̲A̲N̲S̲W̲E̲R̲
Q̲U̲E̲S̲T̲I̲O̲N̲ C̲O̲R̲R̲E̲C̲T̲ ̲A̲N̲S̲W̲E̲R̲
1. a.
2. b.
3. a.
4. b.
5. c.
6. b.
7. a.
8. b.
9. c.
10. b.
4.6 S̲A̲M̲P̲L̲E̲ ̲T̲R̲O̲U̲B̲L̲E̲S̲H̲O̲O̲T̲I̲N̲G̲
Reported problem: No Display
The terminal reveals the following faults when analysed
in conjunction with the Board-level troubleshooting
flowchart:
STEP 1: Power on.
STEP 2: Raster is present.
STEP 3: D.C. voltages are O.K.
STEP 4: Raster is stable and full size.
STEP 5: Power off. Wait for at least 15 seconds.
Power on.
STEP 6: No menu display - raster still present
STEP 7: Power off. Turn Bell control fully
counter-clockwise.
STEP 8: Power on - Bell sounds. Wait at least
ten seconds.
STEP 9: Press Control G - Bell does not sound.
What action should be taken?
̲ ̲ ̲ ̲ ̲
Solution in Appendix A.
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A̲P̲P̲E̲N̲D̲I̲X̲ ̲A
T̲r̲o̲u̲b̲l̲e̲s̲h̲o̲o̲t̲i̲n̲g̲ ̲e̲x̲e̲r̲c̲i̲s̲e̲s̲ ̲-̲ ̲S̲o̲l̲u̲t̲i̲o̲n̲s̲
Section 2
The cause of the reported problem is that "Auto Justify"
has been selected in the Options menu. When this is
operative, Automatic Justification is proformed at
the completion of Change, Move, Copy and Delete operations,
as well as on departure from Insert mode.
Section 3
The cause of the reported problem is that the host
computer is operating in TTY Echo mode, so that each
character entered is being displayed twice: once on
entry from the keyboard and again on being echoed back
by the host. The remedy for this problem is to select
ECHO TTY mode operation via the Configuration menu.
Section 4
The reported problem is of a very general nature. By
working methodically through the board-level troubleshooting
flowchart, the engineer should be able to determine
that there is a logic fault serious enough to prevent
the completion of the power-up routine. The faulty
assembly should be isolated using the board swapping
technique.
I̲N̲S̲E̲R̲T̲I̲O̲N̲ ̲O̲F̲ ̲P̲R̲O̲B̲L̲E̲M̲S̲ ̲F̲O̲R̲ ̲T̲R̲O̲U̲B̲L̲E̲S̲H̲O̲O̲T̲I̲N̲G̲
Section 2
Select "Auto Justify" in the Option menu. Enter "Y"
in parameter.
Section 3
Via the Configuration menu, enter "N" in ECHO parameter
(TTY mode only).
Section 4
None insert problems. The exercise is to follow the
Board level troubleshooting flow chart.
