VT100.net VT100 Technical Manual

Chapter 1 Introduction and Specifications

This is the technical manual for the VT100 series video terminals. It contains information a service technician or engineer needs to operate, test, and repair the VT100 series to a component level.

Chapter 1 Contains VT100 specifications and documentation ordering information.

Chapter 2 Contains basic operator information, including use of the keyboard, use of SET-UP modes for setting terminal characteristics, and simple trouble checking.

Chapter 3 Contains installation procedures and interface information.

Chapter 4 Contains a technical description of the basic VT100 video terminal. This chapter assumes that the reader has the Field Engineering Print Set, MP00633.

Chapter 5 Contains servicing information for the VT100 series video terminals.

Chapter 6 Contains SET-UP information for the various VT100 series options, installation information, a technical description, and service information for the Advanced Video option, Current Loop option, VT105 Graphics Processor, VT1XX-AC Printer option, and VT125 Graphics Processor.

Chapter 7 Contains a technical description and interfacing information for the standard terminal port (STP).

Chapter 8 Contains interfacing information for the graphics connector.

Appendix A Contains programming information for the VT100 series, including interface timing considerations and descriptions of control functions the VT100 responds to, both in ANSI mode and in DEC VT52-compatible mode. Also contains copy of VT125 Programming Reference Card, EK-VT125-RC-001.

Appendix B Contains a recommended spares list (RSL).

Appendix C Contains a glossary of terms and abbreviations used in this manual.

Appendix D Contains a description of the ANSI code extension techniques.

VT100 Specifications


Height 36.83 cm (14.5 inch)
Width 45.72 cm (18 inch)
Depth 36.20 cm (14.25 inch)
Height 8.89 cm (3.5 inch)
Width 45.72 cm (18 inch)
Depth 20.32cm (8 inch)
Minimum table depth 51.4 cm (20.25 inch)
Monitor 13.6 kg (30 lb)
Keyboard 2.0 kg (4.5 lb)
Shipping weight 18.6 kg (41 lb)


Temperature 10° to 40° C (50° to 104° F)
Relative humidity 10% to 90%
Maximum wet bulb 28° C (82° F)
Minimum dew point 2° C (36° F)
Altitude 2.4 km (8,000 ft)
Temperature -40° to 66° C (-40° to 151° F)
Relative humidity 0 to 95%
Altitude 9.1 km (30,000 ft)
Line voltage 90-128 V rms single phase, 2 wire
180-256 V rms single phase, 2 wire (switch-selectable)
Line frequency 47-63 Hz
Current 3.0 A rms maximum at 115 V rms
1.5 A rms maximum at 230 V rms
Input power 250 VA apparent 150 W max.
Current limiting 3 A normal blow fuse
Power cord Detachable, 3 prong, 1.9 m (6 ft)
CRT 30 cm (12 inch) diagonal measure, P4 phosphor
Format 24 lines × 80 characters or 14 lines × 132 characters (selectable)
Character 7 × 9 dot matrix with descenders
Character size
80 column mode 3.35 mm × 2.0 mm (0.132 inch × 0.078 inch)
132 column mode 3.35 mm × 1.3 mm (0.132 inch × 0.051 inch)
Active display size 203 mm × 127 mm (8 inch × 5 inch)
Character set 96-character displayable ASCII subset (upper- and lowercase, numeric, and punctuation)
Cursor type Keyboard-selectable, blinking block character or blinking underline
General 83-key detachable unit with 1.9 m (6 ft) coiled cord attached
Key layout 65-key arrangement and sculpturing similar to standard typewriter, with 18-key numeric keypad.
Numeric keypad 18-key with period, comma, minus, enter, and four general purpose function keys.
Visual indicators 7 LEDs; 3 dedicated to ON LINE, LOCAL, and KBD LOCKED; 4 are user-programmable.
Audible signals
Keyclick Sound simulates typewriter.
Bell 1) sounds upon receipt of BEL code; 2) sounds 8 characters from right margin (keyboard-selectable).
Multiple bell Sounds upon detection of error in SET-UP save or recall operation.
Type EIA
Speeds Full duplex: 50, 75, 110 (two stop bits), 134.5, 150, 200, 300, 600, 1200, 1800, 2000, 2400, 3600, 4800, 9600, 19,200
Character format Asynchronous
Character size 7 or 8 bits; keyboard-selectable. (Note: if 8-bit character is selected, 8th bit is always space.)
Parity Even, odd, or none (keyboard-selectable)
Synchronization Keyboard-selectable via automatic generation of XON and XOFF control codes.

Ordering Documentation

You can purchase the following VT100 series video terminal documents from DIGITAL’s Accessories and Supplies Group.

Title Part Number
VT100 User Guide EK-VT100-UG
VT100 Series Pocket Service Guide EK-VT100-J1
VT100 Illustrated Parts Breakdown (IPB) EK-VT100-IP
VT100 Print Set (contains VT1XX-AC) MP-00633
VT105 Technical Manual EK-VT105-TM
VT105 Illustrated Parts Breakdown (IPB) EK-VT105-IP
VT105 Print Set MP-00642
VT125 User Guide EK-VT125-UG
VT125 Print Set MP-01053
VT1XX-CB, -CL Print Set MP-01052
VT125 Illustrated Parts Breakdown (IPB) EK-VT125-IP
VT132 User Guide EK-VT132-UG
VT132 Print Set (contains VT1XX-AC) MP-00748
VT132 Illustrated Parts Breakdown (IPB) EK-VT132-IP
VT1XX-AC Print Set MP-00901

You can order accessories and supplies (including documentation) by mail or phone.

Continental USA

Call 800-258-1710 or mail order to:

Digital Equipment Corporation
P.O. Box CS2008
Nashua, N H 03061

New Hampshire

Call 602-884-6660 or mail order to:

Digital Equipment Corporation
P.O. Box CS2008
Nashua, NH 03061

Alaska or Hawaii

Call 408-734-4915 or mail order to:

Digital Equipment Corporation
632 Caribbean Drive
Sunnyvale, CA 94086


Call 800-267-6146 or mail order to:

Digital Equipment Corporation
P.O. Box 13000
Kanata, Ontario Canada K2K 2A6
Att: A&SG Business Manager
Telex: 610-562-8732

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