TeleVideo TVI-9128 User manual

•
TeleVldeo®
VT100.net
OPERATORS REFERENCE
HANDBOOK
TVI®·9128 and TVI® ·9208
TVI®·912C and TVI®·920C

©Copyright Televideo, Inc., 1979
1979 TeleVideo ®Inc.
Specifications and information subject
to change without prior notification.
680

TABLE OF CONTENTS
1.0 General Features 1
1.1 Options 1
2.0 General Description ..................... .. 2
3.0 Specifications.............................................................. 2
3.1 Monitor................................................................ 2
3.2 Displayed Character Set. .................................................. .. 2
3.3 Character Font. ........................................................ .. 2
3.4 Keyboard Format. ...................................................... .. 2
3.5 Editing Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2
3.6 Cursor Controls ........................................................ .. 2
3.7 Formatting Features ..................................................... .. 3
3.8 Parity................................................................. 3
3.9 Repeat................................................................ 3
3.10 Transmission 3
3.11 Interfaces ............................................................ .. 3
3.12 Data Rates 3
3.13 Dimension. ........................................................... .. 3
3.14 Weight 3
3.15 Operating Environment ................................................... .. 3
3.16 Power Requirements ..................................................... .. 3
4.0 Interconnection ............................................................ 4
4.1 I nterconnections Steps 4
4.2 Main Interface Connector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4
4.3 Printer Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4
5.0 Installation 5
5.1 Local Installation ....................................................... .. 5
5.2 Remote Installation 5
5.3 Terminal TURN-ON Procedure 5
6.0 Functional Description of TVI-912/TVI-920 6
6.1 Keyboard.............................................................. 6
6.2 Contrast Control 6
6.3 Transmission Rates. ..................................................... .. 6
6.4 Mode Selection 6
6.4.1 Conversation Mode 6
6.4.2 Block Mode 6
6.5 Protect Mode .......................................................... .. 6
6,6 The Cursor 7
6.7 Editing Functions 7
6.8 Formatting Capabilities 7
7.0 Operation of TV 1-912/TV 1-920 .............................................. .. 7
7.1
Keyboard Functions ..................................................... .. 7
7.1.1 Control Keys - Functional Description. .................................... .. 9
7.2 Function Keys ........................................................ .. 12
7.3 Numeric Key Pad ...................................................... .. 13
7.4 ON/OFF Switch. ...................................................... .. 13
7.5 TV 1-912/TV 1-920 Controls. ............................................... .. 13
7.6 Attribute Codes. ...................................................... .. 13
7.7 Block Mode Message Transmission ........................................... .. 15
7.8 Conversation Mode Transmission. ........................................... .. 15
7.9 Self-Test Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 16
7.9.1 TV 1-912/TV 1-920 Test Pattern. ........................................ .. 16

TABLE OF CONTENTS (cont't)
8.0 Programming for Remote Computers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 17
8.1
CTR L Functions 17
8.2
ESC Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 17
8.3
Additional Remote Functions. ............................................. .. 17
9.0 Word Structure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 18
10.0 Serial Printer Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 19
10.1 Interface
Connector ..................................................... .. 19
10.2 Transmission Rate 19
10.3
Print Modes. ......................................................... .. 19
11.0 Second Page Memory Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 21
11.1 Description 21
11.2 Alternate Page ........................................................ .. 21
11.3 Auto Flip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 21
12.0 Option Switch Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 22
12.1
S2-UART Terminal Options 23
12.2
S5-UART Terminal Options 23
Jumper Options
Half Duplex Active . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 25
Half Duplex Passive. .................................................... .. 25
Full Duplex Passive. .................................................... .. 25
Full Duplex Active XMTR ................................................ .. 25
Control Board Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 26
Addressable Cursor .....................................................
.. 28
Escape Sequences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 29
TVI-912/TVI-920 ASCII Chart 29
Operators
Quick Reference Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 31
LIST OF PHOTOGRAPHS
7.1 Keyboard Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 8
TVI-920®Keyboa~d 8
TV 1-912® Keyboard 8
7.9.1
TV 1-912/TV1-920 Test Pattern. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 16
12.0
Option Switch Selection 22
12.2
Operator Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 24
Control Board Switches .................................................. .. 26
Terminal Interior ...................................................... .. 27
LIST OF ILLUSTRATIONS
4.2 Main Interface Connector (EIA RS232C Connector Pin/Signal List) 4
4.3 Printer Interface. ....................................................... .. 4
7.6 Example C:
Bit Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 15
9.0 Bit Structure of Serial Data Word 18
10.1 Interface
Connector - P4 Signal/Pin 19
Jumper Options
Half Duplex Active. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 25
Half Duplex Passive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 25
Full Duplex Passive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 25
Full Duplex Active XMTR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 25
Addressable Cursor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.. 28
Escape Sequences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 29
TVI-912/TVI-920 ASCII Chart 30
Operators Quick Reference - TV 1-912/TV1-920 Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 31
ii

TVI-912/TVI-920 SERI ES
VIDEO DISPLAY COMPUTER TERMINAL
OPERATOR'S MANUAL
1.0 GENERAL FEATURES
•Standard 96 ASCII Character set displayable
•1920 Character display
•24 lines x
80 characters
• 9 transmission rates
from 75 to 9600 bps
•14-key numeric keypad
• 6 separate cursor
control keys
•Local
or remote control of conversation/block mode
•Single-key
edit operations (TVI-920 only)
• Page, field, or line edit
• Blinking fields
•Blank fields
•Dual
intensity
•Reverse video
•Underline fields
•Field tab/backtab
•
Typewriter tabs
•Storable tabs
•Protect mode
•Self-test mode
•Cursor addressing &cursor read
•15-cps repeat.
Typamatic keyboard
•Standard RS232,
point-to-point 20ma current loop
•Non-glare etched screen
•
115/230 VAC 50/60 Hz Refresh
•Serial
printer port
1.1 Options
•Second page memory, 1920 characters

2.0 GENERAL DESCRIPTION
The TeleVideo TVI-912/TVI-920 terminals are compact smart terminals. They are the result of state-of-
the-art design improvements which
allow them to offer high level performance at extremely low cost.
The
TV 1-912/TV1-920 terminals are compatible with most computers.
Standard features include editing capability, protected field, addressable cursor, micro-processor con-
trol, line and character insert/delete, upper and lower case characters and tabbing. Switchabletransmis-
sion rates ranging
from 75 to 9,600 baud are standard. Also included as standard is abuffered serial
printer port. A 1,920-character second page display memory is optional on all models.
3.0 SPECIFICATIONS
3.1
Monitor
Size: 12 inches (diagonally measured)
Phosphor: P4, non-glare read-out
3.2 Displayed Character Set
96-character ASCII upper and lower case alphabet
Number of lines: 24
Characters per line:
80
Screen capacity: 1,920
Dual intensity
Blinking fields
Secure fields (non-display)
Inverse video
Underlined fields
3.3 Character Font
7 x 10 dot matrix with 12 x 10 resolution
3.4 Key Board Format
3.5 Editing Features
Clear screen to space or null
Typeover
Character insert and character delete
Line insert and line delete
Absolute cursor addressing
Erase to end of page
Erase to end of line or field
Line
edit
3.6 Cursor Controls
~,~, t, t, New line, Home, Tab, Back Tab
2

3.7 Formatting Features
Tab
Back tab
Column tab
set
Blinking field
Inverse video
Underline
Dual intensity
Protected field
3.8 Parity
Even, Odd, Mark, Space or No Parity.
3.9 Repeat
15-cps auto-repeat
3.10 Transmission
Conversation mode: Full or half duplex
Block mode: Formatted
information transmitted by line or page, protected and unpro-
tected data,
or unprotected data only.
3.11 Interfaces
Standard RS232 point-to-point
20ma current loop
RS232
to printer port
3.12 Data Rates
9 speeds: 75, 110, 150,300,600, 1200,2400,4800,9600
3.13 Dimension
Height:
Width:
Depth:
3.14 Weight
301bs.
13-1/4"
16-1/8"
20-1/16"
13.95 kg
33.66 cm
40.96 cm
50.96 cm
3.15 Operating Environment
Ambient temperature range (non-condensing): O°C to 50°C (32°F to 122°F)
Maximum relative
humidity: 95%.
3.16 Power Requirements
115 VAC at 0.5 amps/230 VAC at 0.25 amps, 50/60 Hz, 55W
3

4.0 INTERCONNECTION
4.1 Interconnection Steps
Step 1:
Step 2:
Making sure the power switch on the terminal
is turned OF F, plug the terminal power
cord
into grounded outlet.
Connect the cable from the remote computer or modem to the interface connector (P3).
4.2 Main Interface Connector (E IA RS232C Connector Pin/Signal List)
Pin No. Signal Name Bell System Code
1Frame Ground
AA
2Transmit Data
Output
BA
3Receive Data
Input
BB
4Request
to Send Output
CA
5Clear
to Send Input
CB
6Data Set Ready (opt.)
Input
7Signal Ground
AB
8Carrier Detect
Input
20
Data Terminal Ready Output
CD
25 Current Loop +
13 Current Loop -
Transmit*
12
Cu rrent Loop +
24
Cu rrent Loop -Receive*
*Internal Strap Options for Active/Passive. (See page 25 "Jumper Options").
4.3 Printer Interface
Pin No. Signal Name
1Frame
Ground
3Serial Data (RS232)
4Printer Ready (Jumper Select)
6Terminal Ready
7Signal Ground
8Terminal
Ready (Jumper Select)
20 Printer Ready
4

5.0 INSTALLATION
5.1 Local Installation
The TVI-912/TVI-920 with astandard communications interface (RS232) can be cabled directly
to alocal computer.
5.2 Remote Installation
The TVI-912/920 can communicate with remote computers using amodem connected between
the
TVI-912/920 and the communication lines.
5.3 Terminal TURN-ON Procedure
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
First make sure
that ON/OFF switch at the rear of the terminal is in OFF position.
Plug the terminal cord
into agrounded 115VAC outlet.
Set the ON/OFF switch to ON position; the beep will sound.
Cursor
will appear at its home position in approximately 20 seconds.
If the cursor does not appear at the "home" position, press HOME key. If the cursor
still does
not appear, check if the brightness control is properly adjusted.
5

6.0 FUNCTIONAL DESCRIPTION OF TVI-912/TVI-920
6.1 Keyboard
The TVI-912B has a 84 key keyboard comprised of alphanumeric characters, symbols and control
keys to perform its full operation.
The
TVI-920B has a103 key keyboard which adds 11 special function keys, six editing keys, and
two transmission keys.
The
TVI-912C has a 82 key keyboard, in astandard typewriter style, with alphanumericcharacters,
symbols, and
control keys.
The
TVI-920C has a 101 key keyboard, in astandard typewriter style, that adds 11 special func-
tion keys, six editing keys and two transmission keys.
6.2 Contrast Control
The brightness of displayed data on the screen can be adjusted by means of a control knob on the
rear
of the TVI-912/TVI-920.
6.3 Transmission Rates
The TVI-912/TVI-920 meets the standard transmission rates of computer interfaces, telephone
data lines, and modems
with 9speeds: 75, 110, 150,300,600, 1200,2400,4800 or 9600 baud.
Speed
is selected by means of switches on the rear of the terminal.
6.4 Mode Selection
The TVI-912B/TVI-920B selects Block Mode with CTRL/ESC. The TVI-912C/TVI-920C selects
Conversation or
Block Mode by operation of the Block/Conversation key in conjunction with the
IIControl" or IISh ift" key.
6.4.1 Conversation Mode
Half Duplex: In Half Duplex mode, the TVI-912/TVI-920 sends and receives data in only
one direction at atime. Characters are displayed on the screen and transmitted to the
computer at the same time as they are typed from the keyboard. TVI-912/TVI-920
receives and displays data simultaneously.
Full Duplex: In Full Duplex,
TVI-912/TVI-920 sends and receives data in both direc-
tions simultaneously. Characters are transmitted
as they are typed, but they are not
displayed. The typed characters are echoed from the computer back to the terminal,
then
they are displayed on the screen.
6.4.2
Block Mode
In Block Mode,
TVI-912/TVI-920 sends and receives data in complete blocks. Data up
to afu II screen can be entered by operator. In th is mode, characters are stored and dis-
played
but not transmitted until aspecial code sequence is received by the terminal, or
by the depression of a "send" key on the TVI-920. The edited data can be transmitted
partially or completely. This mode is utilized for fast transmission of large blocks of data.
6.5 Protect Mode
In Protect mode, those character positions designated as protected (lower intensity) cannot be
modified. The cursor cannot enter aprotected field. The cursor will be advanced across the pro-
tected
field to the next unprotected position. The cursor may be back-spaced across aprotected
field.
(All protected characters are identified by half intensity.)
6

6.6 The Cursor
The cursor of TV 1-912/TV1-920 is areverse video block, rectangular-shaped marker on the screen
which indicates the entry spot for the following character to be typed. When typing, the cursor
moves
from left to right. If the cursor is placed over acharacter already displayed, the character
is changed into areverse image inside the cursor. The cursor can be moved up, down, left, right or
home by pressing acursor motion key. Any desired cursor position in the display area can be
obtained using an absolute cursor address of Y (Iine-) and X(column) combination.
6.7 Editing Functions
Clear screen to spaces or nulls
Character typeover
Clear unprotected positions
Character insert and character delete
Line insert,and line delete
Erase to end of line or field with spaces or nulls
Erase to end of page with spaces or nulls
6.8 Formatting Capabilities
Tabs: When in protect mode, the tabs, forward and back, are set using columns of
protected characters. The TV 1-912/TV1-920 also offers typewriter-sty Ie tab
when
not in Protect mode. Up to 80 tab positions may be set without loss of
character location.
Field Reverse: The data
can be displayed as black characters on a white background.
Field
Blinking: Blinking fields can be designated over areas of the display and the designated
areas blink on and off, at a 2 Hertz rate.
Field Blanking: Blank fields
can be designated over areas of the display. The areas are blanked,
although the characters are still entered
into display memory, i.e., can be used
to enter code names, etc.
Field Protection: Protected fields can also
be designated. The protected fields appear at areduc-
ed instensity and, once designated as protected fields, cannot be over-written
unless the
TVI-912/TVI-920 is removed from Protect mode.
7.0 OPERATION OF TVI-912/TVI-920
7.1 Keyboard Function
The TVI 912/TVI-920 keyboard contains alphanumeric keys to enter data, and function keys
(control keys) for controll ing operation. For all the definitions of keyboards and control codes,
please refer
to Quick Reference Guide (page 31).
Control Keys and Functional Description as follows:
7

TV I®-920B Keyboard
TVI®-920C Keyboard
TVI®-912B Keyboard
TVI®-912C Keyboard
8

7.1.1 Control Keys- Functional Description
Control Keys Functional Description
CLEAR SP (ALL)
Performs alocal clear space when depressed. Transmits a
CTR LIZ when depressed
with shift in Conversation Mode.
If in Half Duplex, will also clear screen to spaces along with
transmitting. CTR LIZ when received by the terminal, per-
forms aclear unprotected to spaces.
CHAR INSERT
(920) Moves character in the cursor
position and all succeeding
ESC Q
(ALL)
characters to the right by one position. If no protected field
is encountered between the cursor and the end of the line,
this operation terminates at the end
of the line and the last
character in the line
is lost. If aprotected field is encountered,
and Protect Mode
is on, the operation will terminate at the
end
of the unprotected field at which the cursor rests, and
the last character in
that field is lost.
CHAR DELETE
(920) Deletes character in cursor position.
If no part of the line is
ESCW
(ALL)
protected, characters following the cursor are moved to the
left.
If the line has aprotected field, only the characters from
the cursor to the protected field are moved to the left. This
operation terminates at the end
of the line, if no protected
fields are on the line.
LINE INSERT
(920) Inserts aline
of nulls between the line above the cursor and
ESC E
(ALL)
the line where the cursor is positioned. At this time, the line
where the cursor
was located and all following lines move one
line downwards. The
cu rsor is positioned at the start of the
new line. The
bottom line of the screen is lost. If in Protect
mode, no operation
is performed.
LINE DELETE
(920) Deletes completely the line where the cursor
is located. All
ESC R
(ALL)
following lines move one line upwards. Cursor is positioned
at the start
of the line. If in Protect mode, no operation is
performed.
LINE ERASE (920)
Erases all character positions from cursor to the end of the
ESC T, (ESC t)
(ALL)
line where the cursor is located and replaces with Space
Codes (ESC T)
or Null Codes (ESC t) if shifted (TVI-920
only). If in protected mode, the operation will end at the
first protected location to the right of the cursor.
PAGE ERASE (920)
Erases all character positions from cursor through end of dis-
ESC Y, (ESC y)
(ALL)
play and replaces with Space Codes (ESC V), or Null Codes
(ESC y)
if shifted (TVI-920 only). If Write Protect is on, pro-
tected
spaces or nulls will be written. (Note that if the entire
page is protected in Protect Mode, the cursor will stop in the
Home position and no
further character may be entered until
an unprotected area is made available, or Protect Mode is
turned off.)
CTRL
(ALL)
Modifies the code transmitted by pressing another key.
9

ESC
(ALL) This key generates the standard ASCII ESC (I BH). Receipt of
this code causes the following character to be interpreted as a
Function command. This key does not repeat.
RUBOUT
DEL
(912B,920B) This key is effective only in Conversation Mode. Computer
(912C,920C) normally interprets '/RUBOUT" as acharacter erase code.
BREAK
TAB
CTRL/I
BACKTAB
ESCI
HOME
CTRL/I\
PAGE
NEWLINE
CTRL/-
(ALL)
(ALL)
(ALL)
(ALL)
(ALL)
(ALL)
912B,920B
(ALL)
Transmits the TTY break signal.
In Protect Mode,
TAB key moves the cursor forward to the
first unprotected character following aprotected field. If
there is no following unprotected character, the cursor moves
to the Ilhome" position. If not in Protect Mode, the cursor
is moved to the next column Tab location. If no more Tabs
are set,
the cursor does not move. (Transmits CT R L/I.)
In PROTECT MODE, IIBACK TAB" key moves cursor back-
wards
to the first character position of its field. If cursor is
at the first character position of its field, it moves to the first
character position of the previous field. If cursor moves
through
Ilhome", it comes to rest at the last unprotected
position on the screen. In conversation mode, no action
is
taken. (Does not transmit code.)
Moves cursor
to the first character position of the top line of
the display. If the Ilhome" position is protected, cursor
moves
to the first unprotected position following (if Protect
Mode
is set). Transmits ASCII RS code (IEH).
Moves the cursor to the first character position of the next
line. If that position is protected, cursor moves to the first
unprotected position (Transmits CTRL/_.)
SHIFT/PAGE
NEWLINE
ESC K
t ,CTRL/K
~ ,CTR L/J
~,CTRL/H
BACKSPACE
--+ ,CTR L/L
(912B,920B) Displays alternate page. Cursor does not move. (Shift/Page-
Newline does
not transmit acode.)
(ALL)
(ALL) tThis key moves cursor to he next higher line.
(ALL) ~ This key moves cursor to the next lower line.
(ALL) ~ This key moves cursor to next position to its left.
(912C, 920C)
(ALL) --+ This key moves cursor to the next position to its right.
For all
of the above keys, the cursor will advance forward to
the next unprotected position if the character space to be
moved to is protected and Protect Mode is on. (Transmits
corresponding
control code.)
10

TA8SET
ESC 1
(9128,9208) If in Protect Mode, writes vertical column of protected spaces
(ALL) in the column containing the cursor. Column begins in row
containing the cursor and extends through bottom row. If
not in Protect Mode, a typewriter T AS is set. Will not change
any protected characters.
SEND LINE
ESC4
SHIFT/SEND LINE
ESC 6
SEND PAGE
ESC 5
(920)
(ALL)
(920)
(ALL)
(920)
(ALL)
"ESC
4" or SEND LINE key causes unprotected characters
(EXCEPT NULLS) in the displayed line containing the cursor to be
transmitted, if in Protect Mode. All characteristics are transmitted
beginning atthe startof
the unprotectedfield uptothe position the
cursor was in when SEND LINE was requested.
"ESC
6" key causes all characters (EXCEPT NULLS) in the
displayed line containing the cursor to be transmitted. All char-
acters are transmitted beginning at the start of the lineup tothe
position the cursor was in when SEND LINE was requested.
"ESC
5" or SEND PAGE key causes unprotected characters
(EXCEPT NULLS) of the displayed page to be transmitted. All
characteristics are transmitted from the beginning of the first
unprotected field up to
the cursor position when SEND PAGE
was requested.
SHIFT/SEND PAGE (920)
ESC 7(ALL) "ESC
7" causes all characters (EXCEPT NULLS) in the displayed
page
to be transmitted. All characters are transmitted from the
beginning of the page up to the cursor position when SEND
PAGE
was requested.
PRINT
ESC P
(9128,9208)
(ALL)
Enables output to the hard copy printer, which is optional.
PRINT key pressed causes each line to be transmitted to the
printer,
followed by aCR, LF, NUL sequence, from the be-
ginning of the page to the cursor position. The last character
will be followed by CR, LF, NUL. If in Protect Mode, the
protected (half intensity) character
will be replaced by spaces
(used with pre-printed forms).
LINE FEED
(ALL)
CTRL/J
(ALL)
RETURN
(ALL)
CTRL/M
(ALL)
ENTER
(912C, 920C)
SHIFT
(ALL)
ALPHA LOCK
(ALL)
This key moves cursor to the next lower line. If new position
is protected, cursor skips forward to the first unprotected
position.
Moves cursor
to the first character position in the line which
it rests, or to the first unprotected position of the line if in
PROTECT MODE.
Selects upper character indicated on another key. This key
is
also used to change operation of special keys.
Locks upper
case for alpha characters only. Does not affect
numeric or special keys.
11

SPACE BAR
ESC)
ESC (
(ALL)
(ALL)
(ALL)
Causes ablank space to appear on the display. It also causes
ASCII space code (20H) to be transmitted in Conversation
Mode.
"ESC
)" turns on half intensity, and all characters typed
thereafter,
until reset, will be designated as protected, if
Protect Mode is on.
Half
intensity is turned off by IIESC (II.
PROT MODE
(OFF) ESC'
SHIFT/PROT
MODE (ON)
ESC &
CTRL/ESC
SHIFT/BLOCK-
CONV
ESC B
CTR
L/B LOCK-
CONV
ESC C
(912B, 920B) Protected characters shown in lower intensity,
but protection
(ALL) is not effective. The characters written with half intensity on
will be treated the same as all other characters by all editing
functions.
(912B,920B) Protect Mode is set and half intensity characters are pro-
tected
from over-writing or erasure. In Protect Mode, the
(ALL) cursor cannot stay in aprotected character position unless all
positions are protected. In
that case, the cursor will appear in
the Home position.
(912B,920B) Sets the Terminal in Block Mode. When in Block Mode, the
(912C,920C) typed characters are displayed and stored, but not trans-
mitted until a send function is activated. Data may still be
(ALL) received and displayed in Block Mode.
(912C, 920C)
Sets the Terminal in Conversation Mode. When in Conversa-
tion Mode, characters typed are transmitted either in half
(ALL) or full duplex.
ESC@
(EXTENTION
MODE)
ESCA
PRINT MODE)
(ALL)
(ALL)
Causes *all characters received at the modem port to be
transmitted out the printer port (at the same baud rate). CRT
screen continues to be updated. *except ESC A.
Enables
page print only. Characters received at the modem
port will not be transmitted out the printer port.
7.2 Function Keys
Special function transmission is still possible in Block Mode, and does not affect the contents
of the display screen.
Operation
of 11 keys (F1 to F11) on the TV 1-920 causes transmission of the following three-
code sequence:
1. SOH (Control-A)
2. One of 11 characters II@" through IIJ" (Hex 40 through 4A) or "," through Ilj" (Hex 60
through 6A) if used with SHIFT.
3. Carriage Return (control-M)
12

2 = 9600
3= 4800
4= 2400
5= 1200
On the TVI-912/TVI-920, operation of the IIFUNC" key with another character key will cause
transmission of the following sequence:
1. SOH (Control-A)
2. ASCII Alphanumeric code for character key pressed
3. Carriage Return (control-M)
7.3 Numeric Key Pad
The numeric key pad has keys to write numerals from 0 through 9, comma, period, ENTE R,
and -. These keys are affected by SH I FT just as the normal numeric keys.
7.4 ON/OFF Switch
Th is ON/OF Fswitch is located on the rear of the terminal. This two-position Switch controls AC
power
to the terminal. Setting the switch to ON position resets terminal circuits, positions cursor
at
"home", and clears display memories to unprotected spaces.
7.5 TVI-912/TVI-920 Controls
The ON/OFF and other manual controls are located on the rear of the terminal.
Contrast
Control: Desired character brightness relative to screen background can be selected by
th is control>
Conversation Mode Switch:
Full or Half-Duplex Conversation Mode operation can be selected by
this switch and it is located inside the terminal (accessable from the rear of the terminal).
Baud Rate Switch: This 10-position switch selects transmission rate at one
of nine standard speeds
from 75 baud to 9600 baud. (ONLY ONE SWITCH MAY BE DOWN AT A TIME.)
6 = 600
7= 300
8=150
9=75
10= 110
7.6 Attribute Codes
Setting or Resetting Visual attribute (Blink, Blank, Reverse or Underline) always overrides any
previous Visual attributes set. Therefore,
to add an attribute to any that already exist in the char-
acter locations beyond which the cursor rests, all the attributes desired must
be started at that
point.
EXAMPLE A
Assume a
full screen of Reverse Video. You wish to have the bottom half
of the screen Underlined and Reverse Video.
Position the cursor at line 11,
column 80. Issue to the TVI-912/TVI-920
ESC j, then backspace to the same position and issue ESC I. The bottom
half of the screen only is now Reverse Video/Underlined.
13

To eliminate any single attribute that exists with others, the attributes that are to remain must be
set again, and then the undesirable attribute turned off with the appropriate ESC Sequence.
EXAMPLE B
Assume a
full screen of only Reverse Video. You want to display a Page
Heading of Underline Reverse Video in the center of the second line.
Position the cursor one
space before where the new attribute is to be set.
Issue ESC j(Start Reverse Video), then backspace to the same position
and
issue ESC I. The screen will now be Reverse Video/Underline from
that point to the bottom of the page. Now position the cursor one space
past the desired end of the Reverse Video, Underlined Field and issue
ESC j, backspace and issue ESC m. The screen will now be Reverse Video
with an underline/Reverse Video Field on the second line.
To display more than one Visual attribute over the same area, position the cursor one space prior
to the location at which the attributes are to be displayed and issue the appropriate ESC sequence
for the first attribute to be set. To set the second attribute, positon the cursor over the same loca-
tion used to set the first attribute (or piggyback) and issue the next proper ESC sequence. Con-
tinue this until all desired attributes are set.
All Visual attributes set (except Half Intensity-see page 11) will be displayed from the location
at which they were set, to the end of the page, or until they encounter another attribute set
code. This will act as a terminator for the above mentioned attribute(s).
To keep attributes from being erased in Protect mode, they should be set in Write Protect.
EXAMPLE C
Assume
No attribute on screen and cursor in home position.
Issue "Write Protect On" code (ESC) )then attribute set code i.e., ESC
j for Reverse Video. Then reset Write Protect (ESC ( ) and set Protect
mode (EXC
&) or "Shift Prot" on keyboard. Now depress "Clear Space"
key. The screen should still
be in Reverse Video. If screen clears at no
attributes at all, repeat above procedure.
If Blink or Blank is on with Reverse Video, Underline, or both and it is to be turned off, Reverse
Video, Underline,
or both must be reset at the start of the non-blinking/non-blanking field before
ESC q is issued. When setting more than one attribute use the following order: Reverse, Underline,
then
Blink.
14

When Video attributes are transmitted to the computer via the Send command, or to the printer
by print commands, the following bit map indicates the codes which will be sent.
BIT
7654320
B3 B2
00
BLANK
01 NOT ALLOWED
10
NORMAL VIDEO
11
BLINK
B1 :
START REVERSING VIDEO
BO: START UNDERLINE
If Bit 4 is set, then B3, B2 indicate the start of anew intensity field; otherwise, B3 and B2 have
no effect. Bits 0, 1indicate the start
or end of reversing or underline field. (1=START, O=END).
7.7
Block Mode/Conversation Mode Message Transmission
Send Line
Unprotected: (ESC 4 or SEND LINE)
Cursor moves to the first character position of the line. All following unprotected characters (ex-
cept
NULLS) up through the previous cursor position are transmitted, followed by a RETURN
code. Each protected field is indicated by an FS code.
Send LineAl!: (ESC60rSHIFT/SEND LINE)
Cursor moves to the first character position of the line. All following characters (except NULLS),
protected or unprotected, up through to the previous cursor position are transmitted, followed
by a R ETU RN code. Protected fields are bracketed by ESC) and ESC (sequences.
Send Page Unprotected: (ESC 5 or SEND PAGE)
Cursor moves to '/home" position. All unprotected characters on the display (except NULLS) up
through the previous cursor position are transmitted, followed by aRETU RN code. Protected
fields
are indicated by an FS code. The last character on aline is followed by a US code.
Send
Page All: (ESC 7 or SHIFT/SEND PAGE)
Cursor moves
to Jlhome" position. All characters except NULLS up through the previous posi-
tion are transmitted, followed by aRETU RN code. Protected fields are bracketed by ESC)
and ESC (sequences. The last character on aline is followed by a US code.
7.8 Conversation Mode Transmission
Half-Duplex (Conversation Mode rear panel mode switch to HALF position) Keyboard input
causes graphics and control codes to be transmitted, character by character, and causes characters
to appear on the display. Operation of an edit or command key causes specified action to occur
on the display but no codes are transmitted.
Full-Duplex (Conversation Mode, rear panel mode switch to FU LL position) Keyboard input
causes graph ics and control codes to be transm itted, character by character, but graphics are dis-
played
only upon receipt from the remote computer. Operation of an edit or command key
causes specified action to occur on the display but no code is transmitted.
15

7.9 Self Test Mode
The Self Test Mode may
be used to verify proper operation of the video display circuitry, the
serial interfaces,
UART, and control processor. The test consists of the transmission of the com-
plete displayable character set,
with all attributes (e.g., inverse, underline, protect) exercised.
Terminal must
be CONFIGURED in RS-232-Levels, i.e., S5-6 Down and S5-7 Up.
To invoke the test, perform the following operation:
1. Disconnect any interface connectors to other devices (P3, P4).
2. Clear screen
of all characters.
3. Connect a
jumper between P3-2 and P3-3.
4.
Momentarily short the two pins next to the connector on the keyboard.
5. The display test pattern
will be generated. (Note that the display will update only after 100
characters have been transmitted -this may
be asignificant delay at slower BAUD rates.)
6.
After all test patterns have been displayed, the BE LL will sound.
7. Verify the test pattern as shown.
7.9.1
TV 1-912/TV1-920 Test Pattern
16
~Blinking
Line