Appendix I

DECwriter III (LA120) Programming Summary

The most current operating and programming information on the DECwriter III is reproduced here.

Set-Up

Key Function/Comments
CTRL and SET-UP Locks LA120 in set-up mode. SET-UP light flashes.
To exit set-up mode press SET-UP
SET-UP Places LA120 in set-up mode while SET-UP is held down. SET-UP light flashes.
To exit set-up mode release SET-UP

Notes:

  1. LA120 must be in set-up mode to set the following features.
  2. Do not use SHIFT unless specified.

Forms

Key Function/Comments
SHIFT Display current line number.
Releasing SHIFT returns display to current column number
1 Set horizontal tab at current column
SHIFT and 1 Set vertical tab at current line
2 Clear horizontal tab at current column
SHIFT and 2 Clear vertical tab at current line
3 Clear all horizontal tabs
SHIFT and 3 Clear all vertical tabs
4 or SHIFT and 4 Establish top of form (TOF)
5 Set minimum column number (left margin)
SHIFT and 5 Set minimum line number (top margin)
6 Set maximum column number (right margin)
SHIFT and 6 Set maximum line number (bottom margin)
7 Clear left and right margins
SHIFT and 7 Clear top and bottom margins
F Form Length

Note: Changing form length clears top and bottom margins and establishes TOF

Display
1 thru 168 Lines per form
H Horizontal pitch (Characters per inch)

Note: Changing horizontal pitch clears left and right margins

Display Pitch
5 5.00 cpi
6 6.00 cpi
7 6.60 cpi
8 8.25 cpi
10 10.00 cpi
12 12.00 cpi
13 13.20 cpi
16 16.50 cpi
V Vertical pitch

Note: Changing vertical pitch clears top and bottom margins.

Display Pitch
2 2 lpi
3 3 lpi
4 4 lpi
6 6 lpi
8 8 lpi
12 12 lpi

Operator Comfort

Key Function/Comments
G Bell volume
0 = Low Volume
1 = High Volume
K Key click
0 = Off
1 = On
R Auto repeat
0 = Off
1 = On
Z Last character view
0 = Manual
1 = Auto

Communication

Key Function/Comments
A Auto answerback
0 = Off
1 = On
B Buffer control
0 = Small
1 = Large
C Printer character set
1 = United States
2 = United Kingdom
D Auto disconnect
0 = Off
1 = On
E Local echo
0 = Off
1 = On
J Auto new line at right margin
0 = Off
1 = On
L Auto line feed (Return key)
0 = Off
1 = On
M Modem
1 = FDX, No Modem
2 = FDX, Modem
3 = HDX, Supervisory
4 = HDX, EOT
5 = HDX, ETX
N Keyboard and printer character set
1 = United States
2 = United Kingdom
O (letter) Alternate character set
0 = Off
1 = On
P Parity and data bits
Display Data Bits Parity
Rec Xmt
1 7 Ignore Mark
2 7 Ignore Space
3 7 Ignore Odd
4 7 Ignore Even
5 7 Odd Odd
6 7 Even Even
7 7 None None
8 8 None None
9 8 Odd Odd
10 8 Even Even
Q HDX initial calling state
0 = Transmit
1 = Receive
S Secondary channel
Display Fdx *
Mode
Hdx *
Rev. Ch.
0 Speed No
1 Restraint Yes
* See M Key, Modem
U Break enabled
0 = No
1 = Yes
W Printer new line character
1 = None
2 = Line feed (LF)
3 = Return (CR)
X XON/XOFF
0 = No
1 = Yes
Y Alternate keypad mode
0 = No
1 = Yes

Key Function/Comments
0 (number) Selects receive and transmit baud rates and number of stop bits
Baud Rate
(Displayed)
Stop Bits
50 2
75 2
110 2
134 1
150 1
200 1
300 1
600 1
1200 1
1800 1
2400 1
4800 1
7200 1
9600 1
SHIFT and 0 Selects split baud rates:
0 selects receive baud rate; SHIFT and 0 then offers a choice of three transmit baud rates.
Receive Baud Rate
(Not Displayed)
Transmit Baud Rate
(Displayed)
Transmit
Stop Bits
600 75 2
150 1
600 1
1200 75 2
150 1
1200 1
2400 300 1
600 1
2400 1
4800 300 1
600 1
4800 1

Store Recall and Status

Key Function/Comments
I (letter) Select factory set-up parameters
8 Print status message
9 Recall set-up parameters
SHIFT and 9 Store set-up parameters

Self Test

Key Function/Comments
T Initiate printing self test
SHIFT and > Initiate non-printing self-test

Note: Type any character in set-up mode to stop self test.