DEC VT220 Technical Manual page 202

APPENDIX B
VT102/220 DIFFERENCES
This appendix describes the major differences between a VT102
terminal and the VT220 terminal operating in a VT100 mode.
Difference Area
LEDs
Alternate
character ROM
Screen freeze
Printer port
connector
Screen refresh
Set-up
RIS function
Off-line/local
Communication
VT102
Programmable
Socket for OEM
supplied
character ROM
NO SCROLL key
25-pin
50/60 Hz
Display in
set-up "bits."
Performs power-up
self test
Off-line mode
disconnects
modem
Full duplex and
half duplex
Transmit speed
limitation of 60
char/s
regardless of
baud rate
Selectable passive
or active 20 mA
B-1
VT220
Non-programmable
Down-line loadable
character set
HOLD SCREEN key
9-pin
60 Hz only
Display in three
languages. Different
display. Has no effect
on software.
Does not perform
power-up self test
Local mode does not
disconnect modem
Full duplex only.
Does not affect
software
Optional transmit speed
limitation of 150
char/s
Passive 20 mA only