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Aspects of design: I 

We designed the Consul series of CRT terminals to appeal to a 
broad cross section of the time sharing market. 

One way to use a Consul is as a direct replacement for 
Teletypes.* With no changes in software. 

But this stand-alone terminal is capable of much more. It has 
features that allow a user to take full advantage of the inherent 
flexibility of a buffered CRT terminal. And thus increase the 
capability of his entire system. 

Teletype compatibility. The three models— Consul 800, 840 and 
880— are all Teletype-compatible. The 800 displays 16 lines of 
32 characters; the 840, 16 lines of 64 characters; the 880, 20 lines 
of 80 characters. All three are available with an optional 
built-in modem. 

Easy to read. Unlike most computer terminals, the Consul uses a 
commercial TV monitor. This allows us to utilize standard 
raster techniques which make for sharp, legible characters. 
Also, we display black characters on a white display page 
centered on the screen. This makes it easy to anticipate the last 
character on a line and the last line on a screen. All of these 
features sharply reduce eyestrain. 

Additional features. The outer shell lifts easily for maintenance. 
A plexiglas front panel reduces glare. All three models are 
made with the same solid state keyboard, the same TV monitor 
and the same proven electronics. 


*Registered trademark of Teletype Corporation 






Aspects of design 


The keyboard. The keys on the left side of the keyboard are 
patterned after the standard Model 33 teletypewriter, but have 
the feel of an office typewriter. On the right are the keys for 
cursor control and editing. There are also keys for blinking 

and formatting data. 

Operating modes— conversational. This mode gives the Consul 
plug-to-plug compatibility with Teletype terminals. Each 
character typed appears on the screen as it is simultaneously 
transmitted. A scroll feature rolls lines of data up the screen 
from bottom to top. 

Edit sub-mode. Unlike most Teletype-compatible terminals, 
Consul allows the operator to edit in the conversational mode 
without retyping the entire line. When the operator moves the 
cursor to correct a mistake, the terminal automatically goes 
into an edit sub-mode. Once editing is completed the terminal 
retransmits the entire line and automatically switches back 
to the conversational mode. As a visual aid, the edited line 
appears white on a black background, the reverse of the 
normal display. 

Operating modes— page. In this mode the operator can write 
and edit an entire page of data before transmission. Each 
character typed goes into the terminal memory and appears on 
the screen. To transmit, the operator strikes the transmit key, 
causing the entire page of data to be transmitted to the computer. 

Operating modes— message. In this mode the operator can write 
and edit a partial page of data. The operator positions the 
cursor at the beginning of the message, and the terminal will 
transmit only that data between the cursor position and 
the bottom of the screen. 

Editing controls. To edit, the operator uses the cursor (up, 
down, forward, backward and home), horizontal tab and screen 
erase controls. An insert/delete feature enables the operator 
to insert or delete a character at any position on the screen. 

Look-ahead feature. In the page and message modes, a look- 
ahead feature saves on transmission time. It scans ahead and if 
the rest of a line is blank, the cursor goes directly to the next 
line rather than transmit blanks. If the rest of the screen is 
blank, the cursor returns to the home position. 


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Aspects of design: m 

Formatting. When the terminal is in the page or message modes, 
a formatting feature allows for the display of both fixed and 
variable data. This feature not only makes data entry easier 
and faster, but assures that all data is entered. 

The operator requests a particular form from the computer (or 
sets one up on the screen herself). She then fills in the 
appropriate blanks. The terminal transmits only variable data 
to the computer. 

When the format feature is on, tabbing enables the operator 
to skip from one variable data field to the next. Fixed data 
appears on the screen as gray characters (half intensity); 
variable data appears in black. 

During transmission, the look-ahead feature scans ahead to the 
end of a variable data field. If the rest of the field is blank, 
the cursor goes directly to the next variable data field. 

Fixed data cannot be erased or altered accidentally because 
the cursor and erase controls operate only on data fields 
reserved for variable data. 

Communications interface. The Consul has a standard EIA 
RS-232-B communications interface so a customer can use 
his own modem. The terminal receives and transmits in half 
duplex at 110 or 300 baud, switch selectable. It is also available 
with a parallel interface for direct connection to a computer. 

Optional modem. A built-in modem, which is optional, can 
operate either acoustically or with hardwire. The acoustic 
coupler uses the handset of an ordinary telephone. Hardwire 
connection can be made directly to a Data Access Arrangement. 


Specifications 

Consul-800—16 lines of 32 characters each, not available with character insert/delete or 
formatting features. 

Consul-840—16 lines of 64 characters each, character insert/delete and formatting features 
standard. 

Consul-880—20 lines of 80 characters each, character insert/delete and formatting features 
standard. 

Modes— conversational (including edit sub-mode), page and message. 

Character set— 64 alphanumeric characters, each formed by 5x7 dot matrix. 

Display presentation— the data appears as dark characters on a light background. 

Screen size— 9" diagonal. 

Refresh rate— 60 frames per second. 

Type of memory— solid state, MOS semiconductor. 

Controls— horizontal tab; screen erase; new line; cursor: up, down, back, forward, home; 
insert/delete (Consul 840 & 880); format on/off (Consul 840 & 880). 

Panel indicators— power, carrier. 

Keyboard— solid state. All TTY alphanumerics and control codes can be generated. 
Communications interface— conforms to El A RS-232-B specif ication . 

Transmission— half-duplex at 110 or 300 baud (switch selectable). 

Modem (optional)— built-in modem operates in two ways: either acoustically coupled, or via 
hardwire connection to a DAA. Compatible with Bell System 1 03 datasets. 

Power— 115 ± 10% VAC/60 Hertz, 110 VA nominal. 

Size— 1 6% " x 20" x 1 4" 

Weight— 50 lbs. (approx.) 



Applied Digital Data Systems Inc. 89 Marcus Boulevard, Hauppauge, New York 11787* (51 6) 273-7799 00570100 



Applied Digital Data Systems, Inc 


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MRD-200 Memory Raster Display 


Features 

Low-cost readout. The MRD-200 makes it practical 
to use TV monitors for reading out alphanumeric 
data from computers, keyboards, magnetic tapes 
or any other serial data source. 

Direct data display from its own memory. The 

MRD-200 accepts ASCII-coded alphanumeric 
serial data, stores it in its own refresh memory and 
displays it on one or more standard TV monitors. 

Compatible video signal. The composite video 
signal is compatible with any commercially 
available 525-line television monitor. 

Flexible data arrangement. Data can be 
displayed in 1, 2, 4, 8 or 16 lines with either 32 or 
64 characters per line. 


Read and write capability. The memory of the 
MRD-200 can be read from, as well as written into, 
using simple control commands. 

Complete cursor controls. The cursor can be 
moved up, down, forward, back and home. 

Line addressing. Each line of data displayed on the 
screen can be individually addressed. 

Convenient editing controls. All or part of the 
screen can be erased. Any character or 
characters can be made to blink. 

Flexible display formatting. Data in any location 
can be placed in a “protected” condition for 
the display of fixed and variable data. 

Outstanding legibility. Clear, stable characters are 
easy to read. Automatic refreshing keeps 
data bright and flicker-free. 



General Description 

The MRD-200 offers an alphanumeric readout that 
accepts serial (bit parallel) ASCII-coded 
characters, stores them in its own refresh memory 
and displays them on one or more 525-line 
television monitors. 

Its memory can store 32, 64, 1 28, 256, 51 2 or 1 ,024 
characters. Data may be arranged on a display 
pagein 1, 2, 4, 8, or 16 lines, with 32 or 64 
characters per line. The data is centered on 
the screen. 

To enter new data, the MRD-200 writes new 
characters over old. Optional controls are provided 
for reading from, as well as writing into, memory. 
Separate buffered output and input lines are 
utilized for the “read” and “write” functions. 

The cursor can be moved in any direction in the 
display page by using the cursor controls. The 
MRD-200 can also move the cursor to the 
beginning of any line by using the “line select” 
command. Cursor movement is accomplished 
without altering any of the displayed data. Other 
controls include a command to erase all or part 
of the screen, a command to blink any character or 
characters, and a command to horizontally tab. 

An optional protection control is available for 
displaying fields of fixed and variable data. For this 
control, the memory locations allocated to fixed 
data are placed in a “protected” condition. This 
prevents the fixed data from being altered or read 
out. It also enables the user to erase only the 


variable data and to tab between fields of variable 
data. 

The MRD-200 is comprised of three major elements: 
editing and control logic, refresh memory, 
and video generator. 

The editing and control section provides the logic 
for changing the cursor location or executing 
the control commands. Each command is 
initiated by a strobe which the user must provide. 

An LSI/MOS shift register memory stores all data 
to be displayed. This memory circulates data in 
synchronism with the scan rate of the 
television monitor and refreshes the display 60 
times per second. To meet various user 
requirements for memory capacity and data 
arrangement, the MRD-200 is available in a Fast (F) 
or Slow (S) memory organization. The two 
memory organizations and their execution times 
are shown in tables 1 and 3. 

The video generator provides all timing and 
synchronizing pulses, and converts the data stored 
in memory into a composite video signal. An 
LSI/MOS Read Only Memory (ROM) within the 
video generator stores the dot pattern for the 
standard MRD-200 character set. Special Read 
Only Memories can be supplied to provide 
customized character sets. 

The MRD-200 can be rack-mounted in a standard 
19-inch RETMA relay rack, taking up 5V4 inches 
vertically. It plugs directly into a 1 17 VAC outlet. 

No additional power supplies are necessary. 



Simplified block diagram MRD-200, Memory Raster Display 


Control Commands 

Write data. Takes a character from the input data 
lines, inserts it into the current cursor location* and 
advances the cursor to the next location. If the 
cursor is in the last location of a line, it advances 
to the beginning of the next line. If it is in the 
last location of the last line, it moves to the 
beginning of the first line. 

Select line. Places the cursor at the beginning 
of the display line whose line number is defined 
by data present at the input data lines. Lines 
are numbered top to bottom, 0, 1, 2, 3, etc. 
up to a maximum of 15. 

Screen erase. Erases the entire screen of data and 
resets the cursor to the beginning of the first line. 
The erase operation consists of inserting 
a blank into each character location. 

New line. Erases all data from the current cursor 
location to the end of the line, and moves the 
cursor to the beginning of the next line. 

Horizontal tab. Each line is divided into 
eight-character fields with tab stops after every 
eighth character. The horizontal tab command 
erases data from the current cursor location 
through the remainder of a field and moves 
the cursor to the beginning of the next field. 

Read data (optional). Presents the character at the 
current cursor location to the output data lines 
and advances the cursor to the next location. 

If the cursor is in the last location of a line, 
it advances to the beginning of the next line. 

If it is in the last location of the last line it moves 
to the beginning of the first line. The character 
presented to the output data lines remains present 
until the next read or write command. 

*The cursor location defines the location to be 
accessed by the next read or write command. 

A cursor mark is not normally visible on the screen, 
but is optionally available as a six-dot underline. 

Optional Protection Control 

This control allows the user to hold data in selected 
fields constant, while varying data in other fields. 
When the protection control is off, all character 
locations are unprotected and data may be 
entered or altered in any location. When switched 
on, data in assigned locations becomes protected. 
Note that the fields assigned to protected and 
variable data may be of any length. 

To utilize this control the user adds an extra tag bit 
to each six-bit input character. All seven bits are 
stored in the MRD-200 memory. The effect of 
the tag bit is explained below. 

With the protection control off, all locations, 
regardless of the state of the tag bit, are 
unprotected and may be altered. Those locations 
with the tag bit “true” can then be placed in a 


protected condition by switching the protection 
control on. 

All control commands operate normally with the 
protection control off. If the blink option has been 
specified, data with the tag bit “true” will blink 
on and off four times per second. 

With the protection control on, characters that 
have been written into memory with the tag bit 
“true” are placed in a protected condition and 
will be displayed at half intensity. Characters 
written with the tag bit “false” are unprotected 
and are displayed at full intensity. 

Control commands will not disturb protected data. 
The cursor will skip over all protected data, 
preventing it from being addressed, written over 
or read out. “New line” or “screen erase” 
commands will change only unprotected or 
variable data. 

The “horizontal tab” command does not move the 
cursor between the normal fixed tab stops. 
Rather, it will erase only the remainder of a field 
of variable data, regardless of its length, and 
move the cursor to the first location of the next 
field assigned to variable data. 


Number 
of lines 

Characters per line 

32 64 

1 

F 

F 

2 

F 

F 

4 

F 

ForS 

8 

ForS 

ForS 

16 

S 

S 


Table 1: Memory Arrangements 

NOTE: This table shows which data arrangements are available 
with fast (F) or slow (S) memory organization. 


A 

B 

C D 

E 

F G 

H 

1 J K L 

M N 0 P 

Q 

R 

S T 

U 

V W 

X 

Y Z X 1 

2 3 4 5 

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7 

8 9 

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Table 2: MRD-200 Character Set 


Control Command 

Execution Time 


Fast 

Slow 

Write Data 

100/i/sec, max 

1 msec, max. 

Line Select 

1/t/ sec 

1/i/sec 

Screen Erase 

1 msec, avg. 

1 msec, avg. 

New Line 

100/t/sec, avg. 

600/i/sec, avg. 

Read Data 

5 msec, avg. 

1 msec, avg. 

Horizontal Tab 

100/t/sec, max. 

1 msec, max. 


Table 3: Execution Times 


Specifications 


Character set 

64 alphanumeric characters. Each character is 
formed by a 5x7 dot matrix. 

Memory capacity 

32, 64, 128, 256, 512 or 1,024 characters. 

Data arrangement 

Lines per display: 1, 2, 4, 8 or 16. 

Characters per line: 32 or 64. 

Number of lines and number of 
characters per line must be specified. 

Display presentation 

The data appears within a display page that is 
centered on the screen. The user has a choice 
of either dark characters on a light background 
or light characters on a dark background within 
the display page. 

Data and control signal levels 

TTL compatible 

Cursor controls 

Forward, Back, Up, Down and Home. Movement 
of the cursor will not affect any of the data 
displayed. 

Cursor mark (optional) 

6-dot underline mark indicates the location to be 
accessed by the next read or write command. 

Video output 

Composite video signal compatible with EIA 
Standard, 525-line TV monitor. 1 volt p-p, 
unbalanced, from 75 ohms able to drive more 
than 1,000 ft. over RG59/U cable. 

Refresh rate 

60 frames/second. 

Video output connector 

BNC. 

Physical 

Size: 5 1 /4"x19"x8" rack mountable in a standard 

19" RETMA relay rack. 

Weight: 15 lbs. (approx.) 

Power 

20 watts at 117 VAC/60 HERTZ; 6 ft. line cord 
provided. 

Environmental 

Operating temperature: 0 to 50°C. 

Operating humidity: 10 to 90% 

Storage temperature: —40 to 85°C. 

ADDS 



Applied Digital Data Systems, Inc. 89 Marcus Boulevard, Hauppauge, New York 11787 (516) 273-7799 


00170100