TeleVideo TVI-912 User manual

1eleVided
Operator's Manual Models 912/920

LIST OF PHOTOGRAPHS
LIST OF ILLUSTRATIONS
10.1 Interface Connector .
10.2 Transmission Rate
..
10.3 Print Modes ..
10
10
.......
11
13
13
................. 13
...... ... 13
................
13
................... 14
.16
.. .. 17
.............. 17
16
Half Duplex Active
Half Duplex Passive
Full Duplex Passive
Full Duplex Active XMTR
Control Board
Switches
Addressable Cursor
Escape Sequences
TVI-912/TVI-920 ASCII Chart
Operators Quick Reference Control
11.1 Description
11.2
Alternate Page
11.3
Auto Flip
7.1 Keyboard Function 3&4
TVI-920® Keyboard 3&4
TVI-912® Keyboard 4
7.9.1
TVI-912/TVI-920TestPattern 8
12.0 Option
Switch Selection 11
12.2 Operator Controls 12
Control Board Switches 14
Terminal
Interior 15
4.2 Main Interface Connector (EIA RS232C
Connector
Pin/Signal List) 2
4.3 Printer Interface 2
7.6 Example
C: Bit Commands . 8
9.0 Bit Structure of Serial Data Word 9
10.1 Interface
Connector-P4 Signal/Pin 10
Jumper Options
Half Duplex Active 13
Half Duplex Passive 13
Full Duplex Passive 13
Full Duplex Active XMTR 13
Addressable Cursor 16
Escape Sequences 17
TVI-912/TVI-920 ASCII Chart 17
Operators Quick
Reference-
TVI-912/TVI-920 Control 16
12.0 Option Switch Selection 11
12.1 S2-UART Terminal Options 12
12.2 S5-UART Terminal Options 12
Jumper Options
9.0 VVord Structure
10.0 Serial Printer Interface
11 .0 Second Page Memory Option
TABLE OF CONTENTS
Options1 .1
3.1 Monitor
1
3.2 Displayed Character Set 1
3.3 Character Font
................ 1
3.4 Keyboard Format 1
3.5 Editing Features 1
3.6 Cursor Controls 1
3.7 Formatting Features 1
3.8 Parity 1
3.9 Repeat 1
3.10 Transmission 1
3.11 Interfaces ... . ......
.. .1
3.12 Data Rates 1
3.13 Dimension 2
3.14
Weight 2
3.15 Operating
Environment 2
3.16 Power Requirements 2
4.0
Interconnection 2
4.1 Interconnections Steps 2
4.2
Main Interface Connector 2
4.3 Printer Interface 2
5.0 Installation 2
5.1 Local Installation 2
5.2 Remote Installation 2
5.3 Terminal TURN-ON Procedure 2
6.0 Functional Description of TVI-912/TVI-920 2
6.1
Keyboard 2
6.2 Contrast Control 2
6.3 Transmission Rates 2
6.4 Mode Selection 2
6.4.1 Conversation
Mode
2
6.4.2 Block
Mode
3
6.5 Protect Mode
3
6.6 The Cursor 3
6.7 Editing Functions 3
6.8 Formatting Capabilities 3
7.0 Operation of TVI-912/TVI-920
3
7.1 Keyboard Functions 3
7.1.1 Control
Keys-Functional
Description 4
7.2
Function Keys 7
7.3 Numeric Key Pad
7
7.4
ON/OFF Switch
7
7.5 TVI-912/TVI-920 Controls 7
7.6 Attribute Codes .
............... .7
7.7 Block Mode Message Transmission 8
7.8 Conversation Mode Transmission 8
7.9 Self-Test
Mode
8
7.9.1
TVI-912/TVI-920 Test Pattern 8
8.0 Programming for Remote Computers
9
8.1 CTRL Functions 9
8.2
ESC Functions 9
8.3 Additional Remote Functions 9
1.0 General Features
2.0 General Description
3.0 Specifications
©Copyright
Televideo®, Inc., 1979 Specifications
and information subject to change without prior notification. 8300001-001

TVI-912/TVI-920 SERIES
VIDEO DISPLAY COMPUTER TERMINAL
OPERATOR'S MANUAL
3.3 Character Font
7 x 10 dot matrix with 12 x10 resolution
24
80
1,920
Full or half duplex
Formatted
information trans-
mitted by line or page, protected
and unprotected data, or unpro-
tected data only.
Conversion mode:
Block mode:
Number of lines:
Characters per line:
Screen capacity:
Dual
intensity
Blinking fields
Secure fields (non-display)
Inverse video
Underlined fields
3.6 Cursor Controls
-, -, I, I. New line. Home, Tab, Back tab
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
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
2.0 GENERAL DESCRIPTION
•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 and cursor read
•15-cps repeat. Typamatic keyboard
•Standard RS232,
20ma current loop
•Non-glare etched screen
•1151230 VAC 50/60 Hz Refresh
•Serial
printer port
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 TVI-912/TVI-920
terminals are compatible with most computers.
Standard features
include editing capability, protected
field. addressable cursor, micro-processor control, line
and
character insert/delete, upper and lower case
characters and tabbing.
Switchable transmission 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.
1.1 Options
•Second page memory, 1920 characters
1.0 GENERAL FEATURES
3.0 SPECIFICATIONS
3.1
Monitor
Size: 12 inches (diagonally measured)
Phosphor:
P4, non-glare
3.2 Displayed Character Set
96-character ASCII upper and lower case alphabet
3.11 Interfaces
Standard RS232
20ma current loop
RS232
to printer port
3.12 Data Rates
9speeds: 75, 110. 150, 300, 600. 1200, 2400,
4800,9600

3.13 Dimension
Height: 13-1/4" 33.66 cm
Width: 16-1/8" 40.96 cm
Depth:
20-1/16" 50.96 cm
3.14Weight
301bs. 13.95 kg
3.15 Operating Environment
Ambient temperature range (non-condensing):
OOC to 50°C (32 OF 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
4.0 INTERCONNECTION
4.1 I nterconnection Steps
Step 1: Making sure the power switch on the terminal is
turned OFF, plug the terminal power cord into grounded
outlet.
Step
2: Connect the cable from the remote computer or
modem to
the interface connector (P3).
4.2 Main Interface Connector (EIA RS232C Connector
Pin/Signal List)
Bell
Pin
No. Signal Name
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 +
li .*
13 ransmlt Current
Loop-
12 Current Loop +R . *
24
ecelve
Current Loop -
*Internal Strap Options for Active/Passive. (See page 13
"Jumper Options").
4.3 Printer Interface
Pir. No.
Signal Name
1Frame Ground
3Serial Data (RS232)
4Printer Ready (Jumper Select)
6Terminal Ready
7Signal Ground
8Terminal Ready (Jumper Select)
20
Printer Ready
2
5.0 INSTALLATION
5.1 Local Installation
The TVI-912/TVI-920 with astandard communica-
tions interface (RS232) can be cabled directly to a
local computer.
5.2 Terminal TURN-ON Procedure
Step 1. First make sure that ON/OFF switch at the
rear of
the terminal is in OFF position.
Step 2. Plug
the terminal cord into agrounded
115VAC outlet.
Step 3. Set the
ON/OFF switch to ON position; the
beep will sound.
Step 4. Cursor will appear at its home position in
approximately
20 seconds.
Step
5. 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.
Caution: When re-closing unit. hand-tighten
screws. being careful not to over tighten.
6.0 FUNCTIONAL DESCRIPTION
OF TVI-912/TVI-920
6.1 Keyboard
The TVI-912 has a 84 key keyboard comprised of
alphanumeric characters, symbols and control keys
to perform its full operation.
The TVI-920B has a
103 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 alphanumeric characters,
symbols, and control keys.
TheTVI-920C has a
101 key keyboard, in astandard
typewriter style, that adds 11 special function 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 acontrol knob on the rear
of the TVI-912/TVI-920. (See Page 24)
6.3 Transmission Rates
The
TVI-912/TVI-920 meets the standard trans-
mission 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 Con-
versation or Block Mode by operation of the
BlockConversation key with "Control" or "Shift" 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

7.0 OPERATION OF TVI-912/TVI-920
6.8 Formatting Capabilities
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
7.1 Keyboard Function
The TVI-912/TVI-920 keyboard contains alphanumeric
keys
to enter data, and function keys (control keys) for
controlling operation. For all the definitions of keyboards
and control codes, please refer
to Quick Reference
Guide (page 16).
Control Keys and Functional Description as follows:
The data can
be displayed as black
characters on a
white background.
When in protect mode, the tabs, for-
ward and back, are set using columns
of protected characters. The TVI-912/
TVI-920 also offers typewriter-style
tab when not in Protect mode. Up to
80 tab positions may be set without
loss of character location.
Blank fields can be designated over
areas
of the display. The areas are
blanked, although the characters are
still entered into display memory,
Le.,
can be used to enter code names, etc.
Protected fields can also be designa-
ted. The protected fields appear at a
reduced intensity and, once designa-
ted as protected fields, cannot be
over-written unless the TVI-912/
TVI-920 is removed from Protect
mode.
Field
Protection:
Field
Reverse:
Field
Blanking:
Tabs:
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 directions
simultaneously. Characters are
transmitted as
they are typed, but they are not displayed. The
typed characters are echoed from
the com-
puter back to
the terminal.
6.4.2 Block
Mode
In Block Mode, TVI-912/TVI-920 sends and
receives data in complete blocks. Data up
to a
full screen can be entered by operator. In this
mode, characters are stored and displayed
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 desig-
nated as protected (lower intensity) cannot be
modified. The cursor cannot
enter aprotected field.
The cursor
will be advanced through the protected
field
to the next unprotected position. The cursor
may
be back-spaced across aprotected field.
6.6 The Cursor
The cursor of TVI-912/TVI-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(line) and X
(column) combination.
6.7 Editing Functions
Clear screen to spaces or nulls
Character typeover
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7.1,1 Control Keys-Functional Description
CLEAR SP
CHAR INSERT
ESC Q
CHAR DELETE
ESCW
LINE INSERT
ESC E
(ALL)
(920)
(ALL)
(920)
(ALL)
(920)
(ALL)
Transmits a CTRL/Z, which when received by the terminal.
performs a clear unprotected to spaces.
Moves character in the cursor position and all succeeding
characters to the right by one position. If no protected field is
encountered between the cursor and the end of the line and the
last character in the line is lost. If a protected 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.
Deletes character in cursor position. If no part of the line is
protected, characters following the cursor are moved to the left. If
the line has a protected 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.
Inserts a line of spaces between the line above the cursor and the
line where the cursor is positioned, At this time, the line where the
cursor was located and all following lines move one line down-
wards. The cursor 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.
4

LINE DELETE
ESC R
LINE ERASE
ESC T. (ESC t)
PAGE ERASE
ESC
Y, (ESC y)
CTRL
ESC
RUBOUT
DEL
BREAK
TAB
CTRL/I
BACKTAB
ESCI
HOME
CTRL
//\
PAGE
NEWLINE
CTRLI_
SHIFT/PAGE
NEWLINE
ESC K
l,CTRLlK
I,CTRL/J
-,CTRL/H
BACKSPACE
-,CTRLlL
TABSET
ESC 1
(920)
(ALL)
(920)
(ALL)
(920)
(ALL)
(ALL)
(ALL)
(912B,920B)
(912C, 920C)
(ALL)
(ALL)
(ALL)
(ALL)
(ALL)
(ALL)
912B,920B
(ALL)
(912B,
920B)
(ALL)
(ALL)
(ALL)
(ALL)
(912C, 920C)
(ALL)
(912B,
920B)
(ALL)
Deletes
completely the line where the cursor is located. All
following lines move one line upwards. Cursor is positioned at the
start of the line. If in Protect mode, no operation is performed.
Erases all
character positions from cursor to the end of the line
where the cursor is locatedand 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.
Erases all
character positions from cursor through end of display
and replaces
with Space Codes (ESC Y), or Null Codes (ESC y) if
shifted (TVI-920 only). If Write Protect is on, protected 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 unprotectedarea is made
available, or Protect Mode is turned off.)
Modifies the code transmitted by pressing another key.
This key
generates the standard ASCII ESC (lBH). Receipt of this
code causes the following character to be interpretedas aFunction
command. This key does not repeat.
Thiskey is effectiveonly in Conversation Mode. Computer normally
interprets "RUBOUT" as acharacter erase code.
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
followi ng unprotected character, the cursor moves to the "home"
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 CTRL/I.)
In PROTECT MODE,
"BACK TAB" key moves cursor backwards to
the first character position of its field. If cursor is at the first
character position of its field, itmoves to the first character position
of the previous field. If cursor moves through "home", 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 Ii ne of the
display. If the "home" position is protected, cursor moves to the
first uprotectedposition following (if Protect Mode isset). 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/ _ .)
Displays alternate page. Cursor does not move. (Shift/Page-
Newline does not transmit acode.)
1This key moves cursor
to the next higher line.
IThis key moves cursor
to the next lower line.
-This key moves cursor to the next position to its left.
-This key moves cursor to the next position to its right.
For all
of the abovekeys, 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.)
If in Protect Mode, writes vertical column of protected spaces 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 TAB is set. Will not change any protected characters.
5

LINE FEED
(ALL)
CTRL/J
(ALL)
RETURN
(ALL)
CTRL/M
(ALL)
ENTER
SHIFT (ALL)
ALPHA LOCK (ALL)
SPACE BAR (ALL)
ESC) (ALL)
ESC( (ALL)
PROT MODE (912B, 920B)
(OFF) ESC' (ALL)
SHIFT/PROT (912B, 920B)
MODE (ON)
ESC &(ALL)
CTRL/ESC (912B, 920B)
SHIFT
/BLOCK-
(912C, 920q
CONV
ESC B(ALL)
CTRL/BLOCK- (912C,
920q
CONV
ESC C(ALL)
ESC@
(ALL)
(EXTENTION
MODE)
ESCA
(ALL)
PRINT MODE)
SEND LINE
ESC4
SHIFT/SEND LINE
ESC 6
SEND PAGE
ESC 5
SHIFT/SEND PAGE
ESC 7
PRINT
ESC P
(920)
(ALL)
(920)
(ALL)
(920)
(ALL)
(920)
(ALL)
(912B,
920B)
(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 at the start of the unprotectedfield up to the 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 charac-
ters are
transmitted beginning at the start of the line up to the
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.
"ESC
7" causes all characters (EXCEPT r-.IULLS) in the di",played
page to be transmitted. All characters are transmitted from the
beginning of the page up to the cursor position when SEND PAGE
was requested.
Enables
output to the hard copy printer, which is optional. PRINT
key pressed causes each
line to be transmitted to the printer,
followed by a CR, LF, NUL sequence, from the beginning 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 byspaces(used with pre-printed forms).
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 (912C, 920q
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.
Causes ablank space
to appearon the display. ItalsocausesASCII
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 "ESC (".
Protectedcharacters shown in lower intensity, but protection is not
effective. The characters
written with half intensity on will be
treated the same as all other characters by all editing functions.
Protect
Mode is setand half intensitycharacters are protected from
over-writing or erasure. In Protect Mode,
the cursor cannot stay in aprotected character position unless all
positions are protected. In
that case, the cursor will appear in the
Home position.
Sets
the Terminal in Block Mode. When in Block Mode, the typed
characters are displayed and stored,
but not transmitted until a
send
function is activated. Data may still be received anddisplayed
in Block Mode.
Sets
the Terminal in Coversation Mode. When in Conversation
Mode, characterstyped are
transmitted either in half or full duplex.
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.
Enables page
print only. Characters received at the modem port
will not be transmitted out the printer port.
6

2 = 9600
3 =4800
4= 2400
5 = 1200
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 TVI-920
causes transmission of the following three-code
sequence:
1. SOH (Control-A)
2. One of 11 characters "@" through "J" (Hex 40
through 4A) or "", through ''j'' (Hex 60 through
6A) if used with SHIFT.
3. Carriage Return (control-M)
On
the TVI-912/TVI-920, operation of the "FUNC"
key with another character key will cause trans-
mission 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, ENTER, and -.
These keys are affected by SHIFT just as the normal
numeric keys.
7.4 ON/OFF Switch
This ON/OFF switch 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 unpro-
tected spaces.
7.5 TVI-912/TVI-920 Controls
This 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
this 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 ATIME.)
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 pre-
vious Visual attributes set. Therefore, to add an
attribute to any that already exist in the character
locations beyond
which the cursor rests, all the
attributes desired must be started at that point.
7
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/U nderlined.
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 'Jideo.
You want to display aPage Heading of Under-
line 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, position the cursor over the same location
used to set
the first attribute (or piggyback) and
issue
the next proper ESC sequence. Continue 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 jfor Reverse Video.
Then reset Write Protect (ESCO 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 ison 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 qis
issued.
When setting more than one attribute use
the
following order: Reverse, Underline, then Blink.
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.
aa a
B4 B3 B2
B1
BO
BIT 7 6 5 4321a
B3 B2
a a BLANK
a1NOT ALLOWED
1a
NORMAL VIDEO
11BLINK
B1: START REVERSING VIDEO
BO: START UNDERLINE
If Bit 4
is set, then B3, B2 indicate the start of a new
intensity field; otherwise, B3 and B2 have no effect.
Bits
0, 1 indicate 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 4or SEND LINE)
Cursor moves
to the first character position of the
line. All following unprotected characters (except
NULLS)
up through the previous cursor position
are
transmitted, followed by aRETURN code. Each
protected field is indicated by an
FS code.
Send Line All: (ESC 6or SHIFT/SEND LINE)
Cursor moves
to the first character position of the
line. All following characters (except NULLS), pro-
tected or unprotected, up
through to the previous
cursor position are transmitted,
followed by a
RETURN code. Protected fields are bracketed by
ESC) and
ESC (sequences.
Send Page Unprotected:
(ESC 5or SEND PAGE)
Cursor moves
to "home" position. All unprotected
characters on
the display (except NULLS) up
through the previous cursor position are trans-
mitted,
followed by aRETURN code. Protected
fields are indicated by an
FS code. The last character
on aline is followed by aUS code.
Send Page All:
(ESC 7or SHIFT/SEND PAGE)
Cursor moves
to "home" position. All characters
except NULLS up
through the previous position are
transmitted,
followed by aRETURN code. Protected
fields are bracketed by
ESC) and ESC (sequences.
The last
character on a line is followed by aUS code.
7.8 Conversation Mode Transmission
Half-Duplex (Conversation Mode rear panel mode
switch to HALF position) Keyboard input causes
character display and control codes to be tranmitted,
character by character,
and causes characters to
appear on
the display. Operation of an edit or
8
command keycauses specified action to occuron the
display but no codes are transmitted.
Full-Duplex (Conversation Mode, rear panel mode
switch to FULL position) Keyboard input causes
characterdisplayand control codes tobe transmitted,
character by character,
but character display are
displayed
only upon receipt from the remote compu-
ter.
Operation of an edit or command key causes
specified action
to occur on the display but no code
is transmitted.
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 transm ission of the completedisplay-
able character set,
with all attribu+es (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
BELL
will sound.
7. Verify the test pattern as shown.
8.
When closing terminal. do notover-tighten bolts;
hand-tightening is sufficient.
7.9.1 TVI-912/TVI-920 Test Pattern

8.0 PROGRAMMING THE REMOTE COMPUTER
lVl-912/TV1-920 can be fully controlled by the remote
computer. The remote computer can execute all the
control functions
that are performed from the keyboard.
The computer controls
the lVl-912/TV1-920 by trans-
ferring
the appropriate ASCII codes over RS232 or
current loop interface.
8.1 CTRL
Functions
used to position the
cursor. For character
representation of
the
coordinate values, refer
to
the Operator's Quick
Reference in
the last
page of
this manual.
Causes
the line and
column
(Y and X)
coordinates of the
cursor, followed
by a
CR code (expressed as
three ASCII characters),
to be transmitted to the
remote terminal.
The next three
characters following
ESC -represent the
absolute page, line and
column coordinates
which are used to
position
the cursor.
Causes
the page, line
and column coordinates
to be transmitted to the
host system followed
by
a CR code.
The same codes are used for control of the lVl-912/
lVl-920 either from the keyboard or by the remote
computer
with the exception of ESC #, ESC".
ESC ?(Read Cursor):
*ESC -(LOAD
CURSOR
AND PAGE
*ESC /(READ CURSOR
AND
PAGE
9.0 WORD STRUCTURE
The lVl-912/TV1-920 used USASCII. This is a7-level
code, but
the lVl-912/TV1-920 carries 8bits in memory
for each character position on
the screen. that is. 7bits to
identify
the character and the 8th bit to identify if it is
protected.
Disables all keyboard
functions (Remote
function only).
Restores keyboard
control (Remote
function only).
The next
two
characters following
the
ESC =represent
the absolute line and
column
(Y and X) co-
ordinates
which are
ESC" (Enable Keyboard):
ESC =(LOAD CURSOR,
CURRENT
PAGE):
When executing acontrol function at the remote
computer, the follwoing rule applies: complement
bit 7of
the code for the character which is typed
while pressing the CTRL key. This generates the
same code produced by striking the character key
while pressing the CTRL key.
8.2 ESC Functions
To execute an escape sequence function from the
remote computer,
transmit the ASCII ESC code
followed
by the character code. Refertopage 28 fora
complete list
of codes.
8.3 Additional Remote Functions
In addition to the keyboard controls described in
previous pages, the remote computer can perform
the following functions:
ESC #(Disable Keyboard):
Bit Structure of Serial Data Word
Switch Settings
of S2 For Common Word Structures
8910
11
P
A
DATA
RSTOP
I
T
y
1 2
S
T
A
R
T
1
156789Data Bits Parity Stop Bits
U D DUX7
No 1
UUD U X7 One
1
U U U U X 7Zero 1
D D D U U 7 Even
1
D D D UD7Odd 1
D U D U U7 Even
2
DUDUD7Odd 2
D D U U U 8 Even
1
D D U U D 8Odd 1
U=Up, D=Down, X=Either Up or Down
9

Asynchronous tranmission means each character is
transmitted as asingle self-contained message with a
start bit. stop bits and apossible parity bit.
When the start bit is received, aclock is started to clock in
the remainder of the word (character). The word structure
can be strapped to transmit and accept either one or two
stop bits. Generally, baud rates of 100 and lower use 2
stop bits, and rates
of 150 higher use 1stop bit.
TVI-912/TVI-920 automatically transmits 2stop bits at
110 baud.
If 8data bits are selected bit 8 will be zero.
The parity bit is added
to the transmission for error
detecting. If parity is used, it follows the character.
Normally,
"even" parity is used for asynchronous trans-
mission and odd parity
for synchronous transmission.
Even parity adds a0 or 1
to the character to make the total
number even. This is checked by the receiver to see if
something
was lost in transmission. Some computers do
not have
the ability to check for even or odd parity but to
expect
that transmission time to be filled with 1or O. This
leaves 5possibilites
for parity: 1) none; 2) even; 3) odd; 4)
zero;
5) one(sometimescalledtrue). The TVI-912/TVI-920
does not allow for zero and true parity with an 8 bit word.
10.0 SERIAL PRINTER INTERFACE
TVI-912/TVI-920 Serial Printer Interface controls an aux-
iliary serial
printer to make a permanent copy of data
displayed
on the screen. This interface can be used with
most RS-232 compatibleserial printers currently available
in
the market, including both character-by-character and
buffered printers. The interface buffers
the data input
from the computer to make it available for editing and
additions from the terminal prior to printing. This interface
also
permits the printer to be operated at a different baud
rate from
the computer input rate.
10.1
Inferface Connector
The printer interface is 25-pin connector J3 located
on
the rear of the control board (accessible from the
rear of the terminal). The J3 signal/pin is described
as follows:
Pin
No. Description
1Frame ground
3Serial DATA (RS232)
4Printer Ready
(Jumper Select)
6Terminal Ready
7Signal Ground
8Terminal Ready (Jumper Select)
20 Printer Ready
10.2 Transmission Rate
The transmission of information to the printer can
be at
anyone of the rates available for TVI-912/
TVI-920-to-computer communication.
10.3 Print Modes
Page Format Mode: This mode (selected by ESC A)
allows the printer to print data exactly as displayed
10
on the screen. Apage format transmission is
actuated by pressing
the PRINT key at the desired
print operation stopping place. The cursor then
moves to "home" position, followed by the data on
the screen. Upon transmitting the last character on
each line,
the terminal sends CR LF NULL sequence
before moving
to the next line.
When the cursor reaches the previous cursor
position (stored
when the print was initiated). the
operation is terminated and final CR LF NULL is
transmitted. (The character under the cursor
is sent.)
Page Format
print operations may be controlled in
anyone of two ways.
•The
912/920 does not have internal printer port
buffering.
•External. Printer
Ready-The T\lI-912/TVI-920
monitors the state of the Printer Ready line(P4,
pin
20 or pin 4) to determine availability of the
printer to accept data. Data is transmitted
continuously as long as the printer is ready.
This
method is normally used with buffered
printers which accept a full line of data
before printing.
S5-3 must be closed and S5-4
must be open to pass the Printer Busy signal.
•
In Protected Mode, all data displayed in
reduced
intensity will be transferred to the
Printer as spaces, thereby allowing the use of
pre-printed forms.
•In Print Mode,
Nulls will be sent as spaces to
facilitate
forms entry operation.
•Extention
Print Mode: This mode (selected by
ESC
@)will enable data received at the modem
port (P3) to be
output on pin 3 of P4. While in
this mode, receipt of a print command will
interrupt the data from P3 and print the page,
then, reconnect
the data from P3 to P4.
11.0 SECOND PAGE MEMORY OPTIO'"
11.1 This option allows access to one additional 1920
character
memory space for usage identical to the
Standard page.
With this option installed, the user
has
the capacity of viewing more than 1set of 24
lines x 80 characters. Operation of this second page
is described below.
11.2 Alternate Page
To view an alternate page of data, the memory may
be
swapped by issuance of ESC K from either the
keyboard
or incoming from the modem port (P-3).
When this is performed, the data currently displayed
will be transferred into memory and replaced with
all data stored in the alternate page. If no data has
been previously stored in
the alternate page, the
screen will be blank with the exception ofthe cursor.
The cursor will rest in the same location on the
alternate page as it was on the previous page when
the action was initiated. If the position the cursor is
to rest in on the new page is protected, the cursor
will automatically jump to the next unprotected
position available. If there are no unprotected

positions available, the cursor vvill go to the home
position and rest there as described in Section 7.1.1.
Only one page may be viewed or acted upon at any
one time.
11.3 Auto Flip (ESC v-ON. ESC w=OFF)
Auto Flip, when turned on with an ESC v puts the
TVI-912/TVI-920 in a mode whereby when a down-
ward vertical motion is attempted by the cursor
from the last enterable line on the current page, the
Alternate page will automatically be displayed
(automatic "New Page") and any data will be
entered on the new page. Aclear unprotected to
spaces
will be performed and the cursor will rest in
the first unprotected location.
If
the terminal is in Scroll Mode when Auto Flip is
enabled,
scrolling is inhibited or over-ridden by
Auto Flip.
If
the terminal is in Non-Scroll or Protect Mode,"the
Auto Flip works as described above.
51
53
cpu------'
To return to normal operational mode, issue the
TVI-912/TVI-920 an ESC w.
In no case can more than the displayed page be
transmitted by send line or send page, nor can any
other than the displayed page be printed.
If
the second page option is not installed, a clear
unprotected to spaces will be performed on the
current page.
12.0 OPTION SWITCH SELECTION
Sl-Modem Port Baud Rate
S3-Printer Port Baud Rate
NOTE: ONLY ONE SWITCH DOWN
2
9,600
7
300
3
4,800
8
150
4
2,400
9
75
5
1,200
10
110baud
6
600
.---- __ 52
--1t:--P2
W25
W30
PAGE 1
L..- PROGRAM ROM
11

12.1 S2-UART ITerminal Options
SWITCH SETTING EXAMPLE
1 2 3 4 5 6 7 8 9 10
I ~L Blinking .Cursor
LEven Parity
Not Used
7Data Bits
L..- 2 Stop Bits
'-------- Send Parity
'--------- 60 Hz
'---------- Full Duplex
'----------- Std. Char. Set
'------------- Not Used
2
3
4
5
6
7
Up
Down
Up
Down
Up
Down
Up
Down
Up
Down
Up
Down
Up
Down
UP
DOWN
Not used
Not
allowed
Alternate Character Set (option)
Standard Character Set
FULL DUPLEX
HALF DUPLEX
60 Hz -Refresh
50 Hz -Refresh
No Parity
Send Parity
2stop bits (may be used with No
parity as space parity)
1stop bit
8Data Bits (may be used with no
parity as Mark parity)
7Data bits
8Not used (Rev Eand
lower must
be up)
9Up Parity Select (EVEN)
Down
(ODD)
10
Up Steady
Cursor (Rev Eand lower
Down Blinking Cursor W25 is used)
12.2 S5-UART ITerminal Options (Reference EIA Stan-
dard RS-232C for signal definitions)
Open
P3-6 Not connected
Closed Data set ready (DSR) received
on P3-6
2Open P3-8 Not connected
Closed Data Carrier Detect (DCD)
received on
P3-8
3,4 S5-3 S5-4
Open Open
P3-20 Not connected
Open Closed Data Terminal Ready is on
when the terminal is ON.
Closed Open Data Terminal Ready
(DTR)
is connected to Request to
Send (RTS).
Closed Closed Not
allowed
5Closed HDX
printer (hardware
control) Rev. K with exten-
sion port off, all data
transmitted out of the
modem port (P3) will also be
transmitted out of the printer
port (P4)
6,7
S5-6 S5-7
Open Open Not
allowed
Open Closed
20 ma current loop input
Closed Open RS232
input
Closed Closed Not allowed
OPERATOR CONTROLS
Transmission ---
Options
Contrast _
ON/OFF Switch -----"
Optional Printer Port ----'
12
Main Port
Baud Rate

JUMPER OPTIONS
*W12:lnstaliation of this jumper connects Output
terminal ready signal to printer connector
W13: Installation of this jumper connects Output
terminal ready signal to printer connector
W22: Installation of this jumper connects Input
P4-6
P4-8
P4-4
printer ready signal to printer connector
*W23: Installation of this jumper
connects printer ready signal to
printer connector
*Traced on REV H PWA's
Input
P4-20
JUMPER OPTIONS
HALF-DUPLEX PASSIVE
HALF·DUPLEX ACTIVE
Current Loop
24
v
TVI·912/920
Install
Resistor
P3
at
R·28
13
Install
Jumper
at
W·16
Remove
20 mA
we
Source
12
24
I--------i
P3
25 \----1
13
Install
Jumpers at:
W·6. W·14,
&W·16
FULL DUPLEX PASSIVE
FULL DUPLEX, ACTIVE XMTR
20mA
Source
RCVR
XMTR
Install +12V
P3
Jumpers at
W·15& W·17
8-
Install
25
Install
Jumpers at:
RCVR
20mA
W·6, W·14.
Source
lOOOhm XMTR 25
13 Resistor
&W·16
at
R·28
13
Cut
W6
Cut
W14
and
12 W16 12
20mA
XMTR Source
24 24
S4/W31:
S4/W32:
Installation of this jumper will enable an
automatic line feed upon receipt of acar-
riage
return from the remote or keyboard.
See note.
Installation
of this jumper will enable trans-
mission of EDT at the end of Send, other-
wise a CR (carriage return) is sent. See note.
S4/W33:
S4/W34:
Installation of this jumper will disable the
automatic CR (carriage return) line feed in
Column 80. See note.
Installation of
this jumper will select Page
Print Mode as
the initial condition at power
up. Extension Mode will be selected other-
wise. See note.
Note: Terminal must be turned off, then on after making these changes.
13

CONTROL BOARD SWITCHES
S3 PRINTER PORT BAUD RATE
14
S1MODEMPORTBAUDRATE
~ .. ~=--+-- 110
75
150
300
600
1200
2400
4BOO
9600
Not-Used (Always Up)
Current Loop Select
S232 Select
HOX Print
Select DTR =Power ON
Select DTR =RTS (P3-20)
elect DCD from
P3-B
Select DSR from P3-6
P3
---lr---'Cursor Control
~Ir---Select Odd Parity
.. """'Ii ....... --rSelect No. Data Bits 7 or 8
--==-----Select 1 Stop Bit (Up=2)
~ .. --Select Send Parity
F:~-i--Select 50 Hz Refresh (Up=60)
"':"":"' ..... --Select Half Duplex (Up=Full)
~..-:---Select Standard Characters
F::--~-Always Up (Open)
Down

(54)
W31
W32
W33
W34
SELF·TEST
TERMINAL INTERIOR PHOTO
15

OPERATOR'S QUICK REFERENCE
TVI-912/TVI-920 CONTROL
Beep CTRL/G
Cursor ~ CTRL/H
Cursor j
CTRL/ J
Cursor f CTRLlK
Cursor - CTRL/L
Home CTRL/I\
New Line CTRL /(underscore)
Set Block
Mode . ESC B
Set Conversation
Mode ESC C
Protect
Mode On .. ESC &
Protect Mode
Off ESC '
Start Half Intensity ESC)
End Half Intensity .. ESC (
Tab (skip) CTRLlI
Back Tab ESC I
Set
Column Tab ESC 1
Clear
Tab ESC 2
Clear
All Tab ESC 3
Tab ESC i
Send Line Unprotect
to Cursor Position ESC 4
Send Page Unprotect
to Cursor Position ESC 5
·Send Whole Page Unprotect ESC S
Send Line
All to Cursor Position ESC 6
Send Page
All to Cursor Position ESC 7
·Send Whole Page ESC s
Clear
All to Space ESC +
Clear All to Null ESC •
Clear Unprotected to
Null ESC:
CTRLlZ, ESC ;
ESC Q
ESC W
ESC E
ESC R
ESC T
ESC Y
ESC t
ESC y
ESC K
ESC/\
ESC _(underscore)
ESC q
ESC j
ESC k
ESC I
ESC m
ESC"
ESC #
ESC =
ESC -
ESC?
ESC /
ESC v
ESC w
ESC @
ESC A
ESC P
Function
Sequence Clear Unprotected to Space
Char Insert
Char Delete
Line Insert
Line Delete
ErasetoEnd of Line .
'Eraseto,End of Page
Line Erase to
Null
Page Erase to Null
Toggle Page
Start Blink Field .
Start Blank Field
End
Blink/Blank .
Start Inverse
End Inverse
Start Underline .
End Underline
Keyboard Enable
Keyboard Disable
Load Cursor (Row, Column)
·Load Cursor (Page, Row, Column)
Read Cursor (Row, Column)
·Read Cursor (Page, Row, Column)
Auto Flip On
Auto Flip Off .
E!<tension Port
On
Extension Port Off/Page Print Mode On
Print Page
·Later models only with A49Bl or A49Cl ROM.
ADDRESSABLE CURSOR
CURSOR POSITIONING
ASCII ASCII ASCII
POSITION
CODE POSITION CODE POSITION CODE
XorY
Transmitted
XTransmitted X
Transmitted
1Space
28
55 V
2!
29
<
56 W
3
..
30
=57 X
4#
31
>58 Y
5$
32
? 59
Z
6 % 33 @ 60
[
7& 34 A
61
\
8 35 8 62
I
9( 36 C 63
1\
10
)
37
0 64 -
11
*
38
E
65
,
12 +
39
F
66 a
13
40 G 67 b
14
41
H
68 c
15
42
I
69
d
16 I
43
J
70
e
17 0
44 K 71 f
18 1
45 L72 9
19 2
46
M
73
h
20
3 47 N74 i
21 4
48
0
75 j
22 5
49
P 76 k
23 6
50
0
77
I
24
7
51
R 78
m
25
852 S 79
n
26
9
53 T
80
0
27 54 U
CURRENT
PAGE: Transmit ESC = YX (Y -1-24; X = 1-80)
*DIRECTPAGE: Transmit
ESC - PYX(P=Oor 1) i.e., ESC=%@(Y=6X=33)puts
cursor at Line 6, Column 33
16
TVI-912/920 ASCII CHART
~ .
000
00
10
10
011
10
01 0 1
11 01 1 1
e6bs '.
, t s b4 b3!b' b, ~
01234567
o0o0 0
NUL OLE SP
0@pp
00
o1 1
SOH DCl
!1AQaq
o0 1 0 2
STX
DC2
..
2BRbr
o01 1 3
ETX
DC3
jf
3CScs
o1o04
EOT DC4
S4 D T dt
o1
01
5
ENQ
NAK
%5 E Ueu
o1 1 0 6
ACK SYN
&6FVfv
o1 1 1 7
BEL
ETB
7GW9w
1 0 o08BS'
CAN
(8HXhx
1 0 o19
SKIP
EM
)9IYiy
HT
1 0 1 0 10
LF I
SUB
•:JZJl
1 0 1 1 11
VT,
ESC
+;K[k{
1 1
00
12
FF .
FS
,<L\II
,
1 1 o113 CR GS
-=MIm}
1 1 1 0
14 SO
~~ME
>N"n-
1 1 1 1 15
51
NEW LINE
/?00
DEL
us
RUB

...
I
..
!
-:
I
ESCAPE SEQUENCES
BINARY
010
011
100
101
110
111
HEX 234567
0000 0 SP
0@
Extention
P Print Page \p
Print
Mode
0001
1!1
Set Tab
APage Q
Char
aq End
Print
Q
Insert
Blink/Blank
Mode
0010
2"
Keyboard 2Clear Tab
B
Set Block
R
Line br
Unlock
Mode Delete
0011 3#
Keyboard
3
Clear All
C
Set Conv.
S
Send Whole
cs Send Whole
Lock
Tabs
Mode Page'
Page
Unprotected
All •
0100 4$4Send
Line DT
Line Erase dt
Line Erase
Unprotected
to Spaces
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1011 B+
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"Later models only with A49Bl or A49Cl ROM.
WARNING: This equipment generates, uses, and can radiate radio frequency energy and if not installed and
used in accordance
with the instruction manual, may cause interference to radio communications. As
temporarily permitted by regulation it has not been tested for compliance with the limits for Class A
computing devices pursuant to Subpart J of Part 15 of FCC Rules, which are designed to provide reasonable
protection against such interference.
Operation of this equipment in aresidential area is likely to cause
interference
in which case the user at his own expense will be required to take whatever measures may be
required to correct
the interference.
17

01eleVicted SysteDls, Inc.
TeleVideo Systems, Inc., 1170 Morse Avenue, Sunnyvale, Califomia 94086
4081745-7760
800/538-8725 (tollfree outside CA) 1WX 910 3387633
Printed in U.S.A.