Micro-Term ACT-SA User manual

OPERATING
MANUAL
model ACT
-SA
SMOOTH SCROLL
miCRO-TERm, Inc.
S1. LOUIS, MISSOURI 63144

OPERATING MANUAL
MODEL: ACT -SA
SMOOTH SCROLL
REVISION A, 1-81
SER. # 80340881 and Above
MTI PART * 1-79820013-0A
COPYRIGHT 1981
MICRO-TERM, INC.

ACT-SA SMOOTH SCROLL

SECTION
1
1.1
2
2.1
2.2
2.3
3
3.1
3.2
3.2.1
3.2.2
3.2.3
3.2.4
3.2.5
3.2.6
3.2.7
3.3
4
ACT·SA COMPUTER TERMINAL tsy
MICRO·TERM, INC.
TABLE OF CONTENTS
PAGE
Installation and Introduction to the ACT-5A . . . . . .. . . . .. . . . . . . . .. . . . . . . .. . . . . . . .. . . . . .. .. 7
Using the ACT-5A Operating Manual. . . . . . . . .. . . . .. . . . . . .. . . . . . . . .. . . . . . .. . . . . . .. . . . . .. 7
Operating Modes. . . . . . . .. . . . . .. . . . . . . . . . . .. . . . . .. . . . . . .. . . . . . . . .. . . . . . . .. . . . . . . .. . . . .. 8
Notes On Protected Fields. . . . . . . . . . .. . . . . . . . .. . . . . .. . . . . . .. . . . . . . . .. . . . . .. . . . . . . . .. .. 8
Transparancy Mode. . . . .. . . . . . . . . . .. . . . . . .. . . . . . .. . . . . .. . . . . . . . .. . . . . . . .. . . . . . . . .. . .. 8
Local SelfTest. . . . . . . . . .. . . . . . .. . .. . . . . . . .. . . . . . . .. . . . . . .. . .. . . . .. . . . . . .. . . . . . . .. . . .. 8
Keyboard ............................................................................. 9
Encoded & Modifier Keys. . . . . . . . . . . . . .. . . . . . .. . . . . .. . . . . . . . .. . . . . . . .. . . . . . .. . . . . . .. .. 9
Function Keys ....................................................................... 10
Li ne/Local Key ...................................................................... 10
CursorControl Keys ................................................................ 10
Break Key .......................................................................... 10
Function Keys ...................................................................... 11
Toggle Video Attribute Keys -Underline, Reduced Intensity, Blink and Reverse Video ... 11
Send Key ........................................................................... 11
Print Key ........................ , .......................... , ....................... 12
Numeric Entry ......................................................... , ............. 12
Response To Control Codes ............................................. , ............. 13
Absolute Cursor Postitioning (Direct Cursor Addressing) ......................... , .. 13
Background Follows .............................................................. 13
Backspace ....................................................................... 13
Bell .............................................................................. 13
Carriage Return .................................................................. 13
Change Intensity .............. , ......................... , ........................ 14
Clear Unprotected ................................................................ 14
Cursor Down ..................................................................... 14
Cursor Right ......... '.' .......................................................... 14
Cursor Off (On) ................................................................... 14
Cursor Up ................ : ....................................................... 14
Delete Character ................................................................. 14
Delete Line ....................................................................... 15
Display Control Codes ............................................................ 15
Enable (Disable) Keyclick ......................................................... 15
Enable (Disable) Scroll ... ' ............................................... , ........ 15
EnterGraphics Mode ............................................................. 15
Erase To End Of Frame ............................................................ 15
Erase To End Of Line ............................................................. 16
Escape ........................................................................... 16
Exit Graphics Mode ............................................................... 16
Foreground Follows .......................................... , ................... 17
Format Mode ..................................................................... 17
Home Up ......................................................................... 17
Home &Clear .................................................................... 17
Home & Clear To (Un)Protected .................................................... 17
Insert Characters ........ " ........................ , .............................. 17
---Insert Line .................................................................... " . 18
Line Feed ........................................................................ 18
Null ... ' " ........................ , .............................................. 18
Pass Through PrinterOn (Off) ..................................................... 18
Print Line ........................................................................ 19
Print Page ........................................................................ 19
Report Character At Cursor Position ............................................... 19

(continued)
Report Cursor
Position ............................................................ 19
Report Present Video Attributes ................................................... 19
Reverse Line Feed ................................................................ 19
Reverse Tab ...................................................................... 20
Rubout .......................................................................... 20
Set End
of Block Character ........................................................ 20
Set Send Data Type
Unprotected .................................................. 20
Set Video Attributes .............................................................. 20
Smooth Scroll (Line Feed) ......................................................... 21
Split Screen Mode ................................................................ 21
Start (End) Blinking Field .......................................................... 21
Start (End) Reverse Video Field .................................................... 21
Start (End) Underlined Field ............ , .............................. , ........... 22
Tab .............................................................................. 22
Underline Current Character ..... , .................................... , ........... 22
5 Interface Instructions ................................................................. 23
5.1 EIA Connector Pin Assignments ...................................................... 23
5.2 Current Loop Interface ............................................................... 23
5.3 Full and Half Duplex Operation ....................................................... 23
5.3.1 Full Duplex Operation ............................................................... 24
5.3.2 Half Duplex With Modem Control .................................................... 24
5.4 Data Rate Selection .................................................................. 24
5.4.1 Selecting the I/O Data Rate ........................................................... 24
5.4.2 Selecting the Printer Data Rate ...................................................... 24
5.5 UART Options ....................................................................... 24
5.6
Printer Port .......................................................................... 25
5.6.1 Buffered Printer Mode ............................................................... 25
5.6.2 Pass-Through Printer Operation ..... , .................. , ............................. 25
6 User Selectable Options ............................................................... 26
6.1 SinglelDouble Underline .............................................................. 26
6.2
Blink Rates ForCursorand Blinking Field ............................................. 26
6.3 Protected Video
Attribute ............................................................ 26
6.4 Keyboard
Auto Repeat Rate ........................................................... 27
6.5
Display Null Character On/Off ......................................................... 27
7 Appendix
7.1 Function Summary ................................................................... 28
7.2
Absolute Cursor Addressing Table .................................................... 29
7.3
Character Sets ....................................................................... 30
7.4 ASCII Codes ......................................................................... 32
8 Warranty and Service
Information ...................................................... 33
9
Custom Modifications ................................................................. 33
10 Suggestion Sheet ..................................................................... 34
6

1.0 INSTALLATION AND INTRODUCTION
The ACT-5A should be positioned on a steady surface and at acomfortable level for the user. A space
of at least 3 inches must be provided at the rear of the ACT-5A to provide ease of access to the power
switch and brightness control. Care should be taken that magazines or other material do not fall
behind the terminal and impede ventilation. The line cord should then be connected to a grounded
power source.
The ACT-5A power
switch is located on the rear of the unit. After a one minute warm-up period, the
monitor should display a blinking block cursor in the upper left corner of the screen. This position
will be referred to as the HOME or HOME-UP position throughout this manual. If the cursor does not
appeal in the home position of an otherwise clear screen, turn the terminal off and back on again. If
the cursor still does not appear, refer to Section 8 of this manual.
Depress the I t~t.1 key on the keyboard. Type on the keyboard. Characters should now appear cor-
responding to the keys depressed and the cursor will advance. There are 80 character positions per
line; after the 80th character is entered on a line a new line is initiated. When the cursor is on the bot-
tom line,the next new line will cause the contents of the screen to scroll upward one line so that the
top line disappears.
Adjust the BRIGHTNESS control, on the rear, for comfortable viewing while maintaining a black
background. Excessive brightness will cause premature phosphor degradation or burning not
covered under warranty.
1.1 USING THE ACT· SA OPERATING MANUAL
All the information necessary to realize the full potential of this powerfully versatile product is con-
tained in this operating manual. We strongly urge you to read the manual thoroughly before you use
the unit.
Section 2 describes the various modes of operation including FORMAT, SPLIT SCREEN, GRAPHICS
and DISPLAY CONTROL CODES.
Section 3 details the operation
of the keyboard and describes the operation of all function keys and
numeric key cluster.
Section 4
lists the multitude of ACT-5A features and their definitions alphabetically. Should you en-
counter problems when attempting to use a particular feature you may refer to its description in Sec-
tion 4 for clarification.
Section 5 describes the Input/Output (I/O) and Printer interfaces. Information contained in this sec-
tion is useful to insure compatibility between the ACT-5A and your host computer.
Section 6 explains the user selectable options which include SinglelDouble Underline, Cursor Blink
Rate, Blinking Field Blink Rate, Selection of the Protected Video Attribute, Keyboard Repeat Rate
and Keyclick Enable/Disable. Instructions are prov ided for changing these
options to meet your
specific tastes or application.
Section 7 is
an Appendix which contains the following useful information: A complete list of soft-
ware controlled features arranged in ascending order by control code or Escape sequence value; a
table to aid in using the Cursor Positioning feature; a complete list of the ASCII codes including their
Hexadecimal, Octal, Binary and Decimal equivalents; and an enlarged presentation of the 7 x 9 dot
matrix for each character in the display set.
7

2.0 OPERATING MODES
The ACT-SA offers a number of useful operating modes that assist the user in communication with
the host computer. Careful study and experimentation with these modes will familiarize the oper-
ator with the many powerful communications techniques offered by the ACT-SA.
Specifically designed to help the user understand the computer outputs are the Display the Control
Codes,
Split Screen, and Graphics modes. By displaying (rather than executing) the control codes
the ACT-SA can present every received code to the operator
for debugging assistance. The Split
Screen mode permits twice as many lines to be displayed on the screen, (provided they are less than
40 characters), greatly relieving the operator's memory. The Graphics mode offers a special set of 32
characters that are useful in presenting fractions and graphic data more clearly.
For efficient communications the Local mode with associated editing features may be utilized to
minimize use of costly host CPU time or to minimize the number of packets transmitted in a pay-by-
the-packet system. The Local mode can also be used for testing and studying the operation of
various terminal features.
To further enhance
efficiency the Format mode, with associated protected fields, may be called
upon to reduce redundant transmissions of forms from the host in data entry applications. It should
be noted that the Format and
Split Screen modes are mutually exclusive.
2.1 NOTES ON PROTECTED FIELDS
Unlike most computer terminals that restrict the protected field video attribute to Reduced Intensity,
the ACT-SA
allows the user to choose this attribute from Reduced Intensity (Standard), Reverse
Video, Blink,
or Underline.
For
explicit instructions on selecting one of the alternate video attributes, please refer to Section 6.3
of this manual. It is important to follow these instructions carefully in order to insure successful use
of the protected fields feature.
NOTE: Several of the ESCAPE sequence features discussed in Section 4 refer to protected or
unprotected positions. The user should
substitute his video attribute selection for the word
"protected" when reading about these features.
2.2 TRANSPARENCY MODE
A very useful feature of the ACT-SA is its capability to display a unique symbol for each of the
ASCII control codes when in the Display Control Code mode. This mode can be entered and exited
only by depressing the ICTRL Iand Gkeys simultaneously while in the LOCAL mode. This aids
both the receive and transmit operations. On the receive side it permits one to identify every
character received by the terminal
settling any format problems caused by otherwise unseen control
characters. On the transmit side
it allows control characters to be imbedded in the displayed data for
transmission in block mode
to the computer.
2.3 LOCAL SELF TEST
The LOCAL mode also provides a means of testing the terminal manually. If the terminal works in
the LOCAL mode any problems are
limited to either the ACT-SA interface, the communication link or
the remote computer.
2.4 X·ON/X·OFF LINE PROTOCOL
Since this terminal is equiped with the SMOOTH SCROLL feature, it requires the host computer to
honor the X-ON/X-OFF protocol to match the input character rate to the scrolling rate. The ACT-5A
perform5
jump scroll operations and refrains from sending any X-OFF or X-ON codes at any time
until the smooth scroll feature is selected (see section 4). When SMOOTH SCROLL is selected, the
ACT-5A automatically sends
an X-OFF code when its input buffer is nearly full or when a PRINT
LINE or PRINT PAGE operation is initiated.
8

3.0 KEYBOARD
ESC
The ACT-5A keyboard contains 88 keys which may be classified as either encoded, modifier or func-
tion keys (see Figure 3.1).
The keyboard features typamatic (Auto-Repeat) operation at a user selectable rate of either 7.5, 15 or
30 characters per second (CPS). This rate is set to 30 CPS at the factory but may be changed accord-
ing to the directionsgiven in Section 6.4 of this manual.
An audible tone is emitted each time a key is struck or when the keyboard is auto-repeating. This
keyclicking feature may be disabled by following the directions in Section 4 of this manual.
16 FUNCTION KEYS
It I ~ I .... I~I
7 8 9
4 5 6
2 3 E
N
T
E
0 R
67 ENCODED KEYS
Figure 3.1 Keyboard Layout
3.1 ENCODED AND MODIFIER KEYS
The majority of keys on the keyboard generate an output code when struck. The aSSignment of out-
put codes to keys is illustrated in Figures 3.1 and 3.2. Note that the rutpr code. generated by the
encoded keys depend on the state
of the four modifier keys -I f~b~1 GTRL El and 1 SHIFTI· The
modifier keys do not generate output codes nor do they cause a keyclick to sound when they are
depressed.
NOTE: The encoded key B and the modifier key I GTRL r have special significance to the
ACT-5A and appear frequently in
this manual in conjunction with another key ego B
G ,I GTRLI c:J The B key should be depressed and released before striking
the
c:=J key in the above example but the I GTRL Ikey (because it is a modifier key) must be
depressed and held down while simultaneously striking the
~ key and released afterthe
c:J key is released.
9

37 37
3838
39 39
2020
37 37 3838 3939 2020
37 37
3838 3939
2020
3434
35 35
3636
2C 2C
3434
35 35 38 36 2C 2C
34 34 35 35 38 36 2C 2C
31 31
32 32
3333
31 31
32 32
3333
31 31
32 32
3333
0000
0000
30 30 2E
2E
0000
30 30 2E 2E
30 30 2E 2E
Figure 3.2 Keyboard Output Codes
3.2 FUNCTION KEYS
3.2.1
Twelve of the sixteen keys in the top row of keys on the ACT-SA keyboard do not generate output
codes but control various functions. These functions are described below.
r:;l KEY
E.I
This key controls whether the ACT-SA is in the ON-LINE or LOCAL mode. When ON-LINE (key up) all
codes generated by the encoded key are transmitted out the 110 and AUX ports and all data received
at
either the 110 or AUX ports is accepted and displayed. When in the LOCAL mode (key down) all
codes generated by the encoded keys are "echoed" to the screen and are not transmitted out either
the 1/0 or AUX ports. Data may be sent out these ports when in the LOCAL mode by invoking a SEND
command as described in Section 3.2.6 below.
NOTE: Due to the dramatic effect that some of the ACT-SA features have on the operation of
the terminal (Enter Split Screen Mode, Display Control Characters etc.) those features may be
invoked
only by an operator typing the appropriate key(s) at the keyboard while in the LOCAL
mode. These features may not be accessed by the host computer by sending codes to the ter-
minal i.e. the same
codes that may be typed at the keyboard in the LOCAL mode to execute
the restricted features are ignored when received from the host computer regardless
of the state of the r:;l switch.
E.I
In the LOCAL mode data sent from the host computer is accepted and displayed so that the operator
does not miss any messages or data that may be generated by the host while in the LOCAL mode.
3.2.2 CURSOR CONTROL KEYS lJJ OJ B B
3.2.3
In the LOCAL mode these keys do not send codes to the host, but move the cursor in the indicated
direction. The cursor temporarily suspends blinking when these keys (or any encoded keys) are
depressed.
This greatly facilitates positioning the cursor quickly and accurately. When ON-LINE,
these keys transmit the following codes:
B KEY
Key
Cursor Up
Cursor Down
Cursor Left
Cursor Right
Code
CTRLZ
CTRL K
CTRL H
CTRL X
This key
forces the serial output to assume the space (logical 0) state for the duration it is depressed.
10

3.2.4
These function keys execute the operations inscribed on them. Refer to Section 4 for a detailed
description of the various functions.
3.2.5 TOGGLE VIDEO ATTRIBUTE KEYS and I
BLINKI
B/W
These keys may be used to change the present video attribute setting causing subsequently typed or
received characters
to be displayed with the new video attribute type. These keys act as toggle
switches i.e. each time they are struck the indicated attribute will change. To change back to its
original value the key should be struck again.
KEY(S) TO CHANGE VIDEO ATTRIBUTES
Intensity
Underline
IBLiNKI
BIW Reverse Video
ISHIFT /I BLiNKI
B/W
Blink
3.2.6 SEND KEY
This key in conjunction with the ISHIFTI and I CTRL Ikeys commands the ACT-5A to transmit all or
part
of the contents of its screen out pin 2 of its 1/0 and AUX communication ports. There are three
types
of SEND operations described below. Each of these operations will send either both un-
protected and protected characters or unprotected characters only. This selection is determined by
the Send Unprotected Only, Send Unprotected and Protected
functions described in Section 4 of
this manual.
KEY(S) SEND OPERATIONS
SEND LINE sends data from left margin to cursor position followed by a carriage return
code.
SEND PAGE sends all data from home to cursor position. At the end of each line a car-
riage return code is sent.
SEND BLOCK stores an end of block marker. at the present cursor position then-
searches backwards for a previous. marker. If one is found, all data from the character
immediately following the. marker to the newly displayed. marker is transmitted.
Carriage return codes are sent at the end
of each line and a-n end of block (EOB) code is
sent at the
completion of the send operation. If no previous. marker is found the send
operation commences at the home-up position.
When sending, all data received from the host is ignored.
PROGRAMMING HINT
In order to avoid transmitting trailing spaces (those between the last displayable unprotected
character and the end
of the line) the screen should be CLEARED TO PROTECTED SPACES before
entering data that is
to be sent in block mode to the computer. This will minimize the time spent
transmitting the line or lines.
When in the LOCAL mode if no data is being sent to the computer by the ACT-5A it will accept data
from
the computer and display it. This allows the user to edit thel dati on the screen, send it and
receive a response from the main processor
without changing the t~g. switch. It also insures that
any messages from the
computer system are not ignored when in the LOCAL mode.
11

KEY(S) PRINT OPERATIONS
Prints data from left margin to cursor position followed by a carriage return and line feed
code.
Prints all data from
home to cursor position. At the end of each line a carriage return and
line feed code is sent.
PRINT BLOCK stores end of text marker. at the present cursor position then searches
backwards for a previous. marker. If one is found all data from the character im-
mediately following the. marker to the newly displayed. marker is transmitted out
the printer port. Carriage return and line feed codes are sent at the end of each line. If no
previous
.marker is found the print operation commences at the home-up position.
At the commencement of the Print Operation, an X-OFF*code is sent to the host. No characters are
removed from the
40 character input buffer during this operation, but they are inserted into the buf-
fer. If the terminal receives more than 24 characters from the host at this time, errors may be in-
troduced into the data stream, and data may be lost. Once the selected print operation has com-
pleted
execution, the characters in the buffer are removed and acted upon. When the buffer is com-
pletely emptied, an X-ON code is sent to allow the host computer to resume transmission.
NOTE: If the host computer does not honor the X-ON/X-OFF protocol, and characters are sent
to the ACT-SA immediately following a print line or print page command, there is a strong
possibility that the input buffer will overflow. In order to avoid this situation, the program in
the
host computer must delay sending characters after a print command until the print opera-
tion has time to finish.
NOTE: The data rate to the printer is independent of the data rate between the terminal and
the
host computer (when using one of the above PRINT functions) and is switch selectable as
described in Section 5.4.2.
*See Section 2.4
3.3 NUMERIC DATA ENTRY
There are three methods provided by the ACT-SA keyboard for facililating the entry of numeric data.
These are
1) Typewriter style - the numbers 1 through 9 and 0 appear in the top row of the main
keyboard
just as on a modern typewriter 2) Calculator style - a 14 key, calculator format numeric pad
is provided
for accounting type data entry and 3) Keypunch style -when the B key is depressed
a numeric key cluster identical to the IBM Model 29 keypunch format is available inlaid in the main
keypad.
This feature is especially attractive to keypunch operators since they needn't sacrifice their
speed learning the calculator format. To disable the r::l key it should be pressed again and will
disengage. L..::.J
12

4.0 RESPONSES TO CONTROL CODES
Numbers shown in braces (eg [07]) represent the Hexadecimal equivalent of the associated ASCII
code.
ABSOLUTE CURSOR POSITIONING (DIRECT CURSOR ADDRESSING)
ABSOLUTE CURSOR POSITIONING allows the user to position the cursor anywhere within the 24 x 80
display matrix. The general format is a lead-in code, followed by two address coordinates. These coor-
dinates must be transmitted to the terminal in ASCII. The cursor assumes the new position after the coor-
dinates have been given. No other coding may be imbedded within this string of characters. Please refer to
Appendix 7.2 for the ABSOLUTE CURSOR ADDRESSING TABLE and Appendix
7.3 for a complete list of
decimal/hex/ASCII conversions. If the cursor is positioned in a protected field in the FORMAT mode, it will
be moved to the first unprotected position.
B [J [14J [(LINE NUMBER)] [(COLUMN NUMBER))
To position the cursor the ASCII code [14J
must be received followed by the appropriate line number (0-23)
and the column number (0-79). If an invalid line is received, it is reduced modulo 24 until a valid line 0-23 is
produced. Similiarly
an invalid column is reduced modulo 80. The top line of the display is line 0; the left-
most column is column O.
EXAMPLE: To position the cursor on the tenth line down and in the fifth column from the left, the following
codes must be received by the terminal.
[14J [09J [04J -ICTRL I [J ICTRL II }~II CTRL IG
When in split screen mode, the Row Number's range from 0-47 and the Column Number's range from 0-38 ..
BACKGROUND FOLLOWS
All subsequent data received by the terminal after receipt of this function code is displayed in low (half) in-
tensity. The terminal is restored to full intensity by giving a FOREGROUND FOLLOWS command.
[18J [43J -B ISHIFTIG
BACKSPACE
This will cause the cursor to move to the nearest character position to the left without erasing data on the
screen. When the cursor reaches
the leftmost column it will stop. If the cursor is in the HOME UP position it
will not move.An attempt to backspace into a protected field in the FORMAT mode will result in the cursor
staying in the
first unprotected position.
[08J - Bc:J
BELL
When the BELL code is received an audible tone of 1760 hertz is generated for one half second. The cursor
position is not affected.
[07J- BG
CARRIAGE RETURN
LOCAL: The cursor is moved to the leftmost unprotected position of the next line. If it is on the bottom line
the screen will scroll.
LINE: The
cursor is moved to the leftmost unprotected position on the present line.
[ODJ -c::J
13

CHANGE INTENSITY
All subsequent data received by the terminal after receipt of this function code is displayed in low (half) in-
tensity. Full intensity is restored when the terminal receives a second code of the same type. Therefore the
change
intensity code acts as a toggle switch.
or{OE} -B Q
CLEAR UNPROTECTED
Receipt of this command will replace all unprotected characters with unprotected spaces and the cursor
will move to the HOME UP position.
{1B} {4C} - E1 ~
CURSOR DOWN
On receipt of the CURSOR DOWN command the cursor is moved down one line in the same column. If the
cursor is on the bottom line of the screen, the position of the cursor will not change nor will the display
scroll. If the cursor attempts to enter a protected field in FORMAT mode, it will move to the first unprotected
position after the protected field.
OJ or {OB} -B c=J
CURSOR RIGHT
The cursor advances one column to the right. The display is not altered. If in the last column it will not move.
If the next position is protected and the FORMAT mode is set the cursor will move to the first unprotected
position it encounters. I
~ I or {18} -B [J
CURSOR OFF (ON)
{1 B} {3A}
OFF
BBD
(ON)
( [18]{38] - E1 D)
CURSOR UP
On receipt of the CURSOR UP command the cursor is moved up one line in the same column. If the cursor is
on the top line
of the screen, the position of the cursor will not change. If the position above is protected and
the FORMAT
mode is set the cursor will move to the first unprotected position following the protected field
it attempted to enter. [[]
or {1A} -B [J
DELETE CHARACTER
Delete the character denoted by the cursor. All characters to the right of the cursor row are moved left by
one
column. The rightmost position is cleared to the video attribute of the last character on the line.
or{1B} {36} B I ~ I
14

DELETE LINE
All data on the line denoted by the cursor is eliminated. Pre-existing data below the cursor is moved up one
line and the bottom line is cleared to the present attribute type.
B DEL
B~El
SHIFT LINE or {1B} {38} ESC 8
CHAR
DISPLAY CONTROL CODES
Typing a in LOCAL
mode conditions the terminal to display all future control characters
rather than
act upon them. The control characters thus become functionally transparent. This transparency
mode is particularly useful for verifying the control characters sent from the main processor. While control
characters are being displayed, the terminal will continue to automatically scroll and initiate a new line after
filling a line with 80 characters. The only control code that will be acted upon is another BG ,from
the keyboard in LOCAL, which will restore the terminal to its normal execution of control character com·
mands. Appendix 7.4 lists the 32 ASCII control characters in hexadecimal, their keyboard representation and
their display counterparts.
NOTE: This can be initiated in LOCAL mode ONLY.
{tt] -B G
ENABLE (DISABLE) KEYCLICK
These functions control the generation of the audible clicks when encoded keys are struck at the keyboard.
[1 BJ [3CJ -B I SHIFTII ~ r~1
({
IB
1I3D] -B 0)
ENABLE (DISABLE) SCROLL
After this code is received LINE FEED's in the bottom row and REVERSE LINE FEED's in the top row per·
form a scroll up or down operation respectively.
{IB] {54]- BB 0 ( {IB] (55] BB m)
ENTER GRAPHICS MODE
This function invokes an alternate character set for ASCII codes [50J [5EJ- I SHIFTI ~ thru [lEJ -
BGJ
Appendix 7.4 lists the ASCII code, its keyboard representation, and its displayed counterpart. This is par-
ticularly useful for generating graphs and displaying fractions or subscripts.
{t BJ {4D] -B I SHIFTII M wi
ERASE TO END OF FRAME (EEOF) PRESENT VIDEO ATTRIBUTES
All characters from the cursor position to the end of the screen are erased to present video attribute spaces.
The
cursor position is not affected.
B B G -[1F]
15

EEOF PROTECTED
Same as EEOF except the Protected Field attribute bit is set on all characters to the right and below the cur-
sor.
-[1BJ
[4AJ
EEOF UNPROTECTED
Same as EEOF except the Protected Field attribute bit is reset on all characters to the right and below the
cursor. B I
SHIFT \I KC§JI - [1 BJ [4BJ
ERASE TO END OF LINE: EEOL
All positions from the cursor to the right margin are replaced by present video attribute spaces.
-
[1EJ
ERASE TO END OF LINE PROTECTED
This code causes the same action as the ERASE TO END OF LINE code except that all positions to the right
of the cursor are cleared to protected spaces.
B8IT]
- [1BJ [40J
ERASE TO END OF LINE UNPROTECTED
Same as EEOL except the Protected Field attribute bit is reset on all characters in the same row and to the
right of the cursor.
[1BJ [49J
ESCAPE
This code conditions the terminal to treat the following code(s) in a special manner. If the code immediately
following the ESCAPE code is a valid ESCAPE sequence code the appropriate ESCAPE sequence feature
will be executed. If not, the illegal code and the Escape code are ignored. For a list of these features see
Table 1 in Appendix 7.1.
Note that to invoke an ESCAPE sequence feature - ESC A - Underline Current Character for example, the
B key must be depressed and released before striking the [J key.
[1BJ -B or B OJ
EXIT GRAPHICS MODE
This will EXIT the GRAPHICS MODE and restore the standard character set. See ENTER GRAPHICS MODE.
[1BJ [4EJ -B ISHIFTI [J
16

FOREGROUND FOLLOWS
All characters received after this command will appear in full intensity. Only these characters, including
spaces, will be transmitted during a SEND LINE or SEND SCREEN.
[18J [42J -B ISHIFTI c:J
FORMAT MODE
Enter: Prevents the cursor from entering the protected fields. Not permissible when in the split-screen
mode. A bell is sounded if an attempt to enter this mode is made when in the split-screen mode. Exit: Allows
unrestricted movement of the cursor.
ENTER EXIT
[18J [44J -B ISHIFTI G [18J [45J -B ISHIFTI [J
HOME UP
This function moves the cursor.to the upper left corner of the screen unless it is protected and the FORMAT
mode is set, in which case it moves to the first unprotected position.
[10J -B [JJ
HOME AND CLEAR
This function moves the cursor to the upper left corner of the screen. The screen is then cleared to present
video
attribute type.
[OCJ -
or B~
HOME AND CLEAR TO (UN)PROTECTED
These codes cause the cursor to move to the upper left corner of the screen and write (un) protected spaces
in all screen
positions.
[18J [60J -B I ::: I 0
1B
) [61} -B [J )
INSERT CHARACTERS
Insert subsequent characters into the cursor row at the cursor position. After this command, all characters
at the cursor
position and to its right are moved one position to the right each time adisplayable character is
typed at the keyboard. To
exit from this mode, any control character may be typed. The ACT-5A will act upon
the control character and sound the BELL
to indicate an exit from the insertion mode.
Key Stroke
ESC G
Space
f
o
x
RETURN
Screen Contents
The quick brown_jumps .. .
The
quick brown_jumps ... (insertion mode entered)
The
quick brown _jumps .. .
The
quick brown f_jumps .. .
The
quick brown fo_jumps .. .
The
quick brown fox_jumps .. .
The
quick brown fox jumps ... (Bell sounds and RETURN Function Performed)
or{18} {47} B \SHIFTI8
17

INSERT LINE
This will allow a new line of text to be added between any two pre-existing lines on the screen. A blank line
will be inserted on the row denoted by the cursor. All pre-existing text on the cursor row and below is moved
down by one line and the last line scrolls downward off the screen. The blank line will be cleared to spaces
with the present video attributes.
~Wl or{18}{37} ~ 1il7&
CHAR '--=J L2J
LINE FEED
This will cause the cursor to move down one line in the same column. If the cursor is on the bottom line, the
screen will scroll. The new bottom line will be filled with spaces of the present video attribute type.
[OAJ -ICTRL I c=1 or
NULL
r:;l
~
Sending the ASCII NULL is accomplished by holding the B key down and then striking any number
key.
[OOJ -B ANY NUMBER KEY
PASS THROUGH PRINTER PORT ON (OFF)
There are two modes of Pass Through Printer Port Operation: Monitor Mode and Non-Monitor Mode. When
Pass Through Printer operation is enabled in either of these modes, all data received from the host computer
is sent directly to the printer port at the same data rate as it was received at the 110 port, and printer output is
routed to the host computer. When Pass Through Printer operation is disabled, received data is not routed to
the printer port nor is the printer output sent to the host computer.
When the ACT-5A is operating in the Monitor Mode, the terminal displays all data received from the host
computer in addition to passing it through to the printer. All keyboard functions are enabled, and the ACT-5A
operates normally. Note that both the output of the printer and of the ACT-5A are tied to the Serial Out Line
and that errors can occur as a result of this if the printer produces output codes (this includes X-ON and
X-OFF codes).
In Non-Monitor Mode, however, the terminal passes the data through to the printer but does not disturb the
contents of the screen. All keyboard functions are disabled, the keyboard is locked and will remain in this
state until the Pass Through Printer Port Off code is received by the terminal from the host computer.
The Pass Through Printer Port Off code disables both Monitor and Non-Monitor Pass Through Printer opera-
tion. ~ rJl
MONITOR PASS THROUGH PRINTER ON: '--=J L..:::SJ - {18}{5C}
NON-MONITOR PASS THROUGH PRINTER ON: B
[JJ - {18} {5D}
PASS THROUGH PRINTER OFF: 8
[] -{19}
18

PRINT LINE
This will cause all characters from the beginning of the line denoted by the cursor to the cursor position (in-
clusive)
to be sent out the printer port. At the end of the line a CARRIAGE RETURN and LINE FEED will be
sent. The
transmission can only be interrupted by the appropriate signal on the printer busy line. While the
line is being transmitted to the printer, no data will be accepted into the terminal. The BELL will sound after
the line has been sent. SEE NOTE SECTION 3.2.7.
{1BJ {46J -B ISHIFTI []
PRINT PAGE
All text from the home position to the Cursor position inclusive will be sent to the printer port. At the end of
each line a CR and LF will be sent. The transmission can only be interrupted by the appropriate signal on the
printer 1/0 ready line. While the line is being transmitted to the printer, no data will be accepted into the ter-
minal. The BELL will sound after all data has been sent. (SEE NOTE SECTION 3.2.7)
{10J - EJ []
REPORT CHARACTER AT CURSOR POSITION
The ASCII code for the character at the cursor position is transmitted to the computer followed by the EOB
Character.
{1BJ {4FJ -I ESC IISHIFTII owl
REPORT CURSOR POSITION
After receiving the ASCII control code ENQ [05J, the terminal will respond by reporting the cursor's current
address coordinates. These coordinates are coded in binary and transmitted in ASCII followed by the EOB
Character. Please refer to Appendix 7.2 for the ABSOLUTE CURSOR ADDRESSING TABLES and Appendix
7.3 for a complete list of decimal/hex/ASCII conversions.
The range of Row Number's is 0-23 in full screen mode and 0-47 in split screen mode. The range of Column
Number's is 0-79 in full screen mode and 0-38 in split screen mode
[05J -
The
terminal will respond with (LINE NUMBER) (COLUMN NUMBER) (EOB CHARACTER)
REPORT PRESENT VIDEO ATTRIBUTES
Upon receipt of this command the present state of the video attributes is transmitted to the host computer
followed by the EOB Character.See the SET ATTRIBUTES command description for a list of output code to
attribute state assignments.
[1 BJ {52J -B I SHIFTI []
REVERSE LINE FEED
This function will cause the cursor to move up one line in the same column. If the cursor is on the top line,
the cursor will remain there, but the screen will scroll downwards; the screen will appear to move down one
line, losing the bottom line of the screen, and forming a blank line at the top of the screen. The blanks in the
top line
will be set to the present video attribute type.
[1 BJ {48J -B I SHIFTI c:J
19