A Specifications

General

This appendix lists the specifications of the VT102 terminal. Also included are X-ray emission statements, loopback connector wiring and related documentation not provided by DIGITAL.

VT102 Specifications

Dimensions
Monitor
   Height 36.83 cm (14.5 in)
   Width 45.72 cm (18 in)
   Depth 36.20 cm (14.25 in)
Keyboard
   Height 8.89 cm (3.5 in)
   Width 45.72 cm (18 in)
   Depth 20.32 cm (8 in)
Minimum table depth 51.4 cm (20.25 in)
Weight
Operating Temperature: 10° C to 40° C (50° F 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 (8000 ft)
Nonoperating Temperature: -40° C to 66° C (-40° F to 151° F)
Relative humidity: 0% to 95%
Altitude: 9.1 km (30,000 ft)
Power
Line voltage 99 to 128 Vac (115 V setting)
198 to 256 Vac (230 V setting)
87 to 107 Vac (100 V setting)
222 to 268 Vac (250 V setting)
Single phase, grounded, 3-wire
Line frequency 47 to 63 Hz
Current 0.70 Arms maximum at 115 Vrms
0.40 Arms maximum at 220-240 Vrms
Input power 70 Wrms or 85 VA apparent
Current limiting 1.25 A fuse (120 Vac)
0.75 A slow blow fuse (220-240 Vac)
Power cord Detachable, 3-conductor grounded
Power cord receptacle EIA specified CEE22-6A
Display
CRT 12-inch diagonal measure, P4 phosphor
Format 24 lines × 80 characters or 24 lines × 132 characters (selected from keyboard or computer)
Character 7 × 10 dot matrix with descenders
Character size 3.35 mm × 2.0 mm (0.132 in × 0.078 in) in 80-column mode
3.35 mm × 1.3 mm (0.132 in × 0.051 in) in 132-column mode
Active display size 203 mm × 127 mm (8 in × 5 in)
Character set ASCII and UK displays 94 characters (with upper- and lowercase, numeric and punctuation), 32-character special graphics set
Cursor type Blinking block character or blinking underline (selected from keyboard)
Keyboard
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 keyboard with an 18-key numeric keypad
Numeric keypad 18-key numeric pad with period, comma, minus, enter, and four general-purpose function keys
Visual indicators Seven indicators: ON LINE, OFF LINE, KBD LOCKED, CTS, DSR, INSERT and one programmable indicator.
Audible signals
   Keyclick Provides audible feedback for each keystroke (selected from keyboard)
   Bell
  • Sounds when BEL character received.
  • Sounds eight characters from right margin (selected from keyboard)
   Multiple bell Sounds on error in SET-UP store or recall operation
Modem Communication
Type Full-duplex with/without modem control, asymmetric full-duplex, half-duplex supervisory and half-duplex with coded control
Speeds 50, 75, 110 (two stop bits), 134.5, 150, 200, 300, 600, 1200, 1800, 2000, 2400, 3600, 4800, 9600, 19,200 baud (selected from keyboard)
Code ASCII (ISO 646 and CCITT Alphabet 5)
Character format Asynchronous
Character size 7 or 8 bits (selected from keyboard)
Parity Even, odd, mark, space or no space (selected from keyboard)
Buffer overflow prevention Automatic generation of XON and XOFF control codes (selected from keyboard)
Echo Local echo available (selected from keyboard)
Printer Communication
Type Full-duplex
Speeds 50, 75, 110 (two stop bits), 134.5, 150, 200, 300, 600, 1200, 1800, 2000, 2400, 3600, 4800, 9600, 19,200 (one stop bits) baud (selected from keyboard)
Code ASCII (ISO 646 and CCITT Alphabet 5)
Character format Asynchronous
Character size 7 or 8 bits (selected from keyboard)
Parity Even, odd, mark, space or no space (selected from keyboard)
Buffer overflow prevention Automatic generation of XON and XOFF control codes

Composite Video Output (J9)
The composite video output provides RS170 output with the following nominal characteristics. See Figure A-1.

Output impedance = 75 ohms, dc-coupled
Sync level = 0 V
Black level = approximately 0.3 V with 75-ohm load
White level = approximately 1.0 V with 75-ohm load

The composite sync waveform meets EIA RS170 standards.

Figure A-1 Composite Video Output

The vertical interval is six equalizing pulses, six vertical sync pulses, and six more equalizing pulses. The timing is as follows.

Equalizing pulse width = 2.3 µs ± 50 ns
Vertical pulse width = 27.28 µs ± 200 ns
Horizontal pulse width = 4.71 µs ± 50 ns
Horizontal blank width = 11.84 µs ± 50 ns, 80 column mode
= 12.34 µs ± 50 ns, 132 column mode
Front porch = 1.54 µs ± 50 ns

FCC Notice

This equipment generates and uses radio frequency energy. It has been type tested and found to comply with the limits for a Class B computing device in accordance with the specifications in Subset J of part 15 of FCC rules, which are designed to provide reasonable protection against radio and television interference in a residential installation. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause interference to radio or television reception, the user is encouraged to try to correct the interference.

VDE Notice

RFI-suppressed according to German regulation 529/1970 and 227/1976 (VDE 0871 Class B).

X-Ray Emission Data
Rated anode voltage 12 kV (fixed)
Dose rate Less than 1.43 pA/kg (20 uR/h)*
* Measured at a distance of 5 cm at any accessible point from the outer surface.
Compliance with
  • CSA 22.2 #154-1975 Paragraph 4.1.4
  • CDA #65
  • UL 478
  • ECMA 57
  • Paragraph 5, clause (2) of German X-ray ordinance (1973)
  • VDE 0804/5.72, para. 23
  • VDE 0730 part 2P/6.76, para. 33
  • VDE 0860 part 1/11.76, para. 6
  • IEC 65 public. 1/1972, para. 6
Workstation exposure Does not expose operator to dangerous X-ray radiation.

Loopback Connector Wiring

From To
EIA Pin 2 Pins 3 and 15
Pin 4 Pins 5 and 8
Pin 20 Pins 6 and 22
Pin 19 Pins 12 and 17
20 mA Pin 1 Pin 3
Pin 2 Pin 7
Pin 5 Pin 8

Related Documentation

ANSI specifications are available from:
Sales Department
American National Standards Institute
1430 Broadway
New York, NY 10018
EIA specifications are available from:
Electronic Industries Association
Engineering Department
2001 Eye St. NW
Washington, DC 20006
International standards are available from:
CCITT
UN Book Store
United Nations Building
N.Y., N.Y. 10017