This appendix describes the major differences between a VT102 terminal and the VT220 terminal operating in a VT100 mode.
|LED indicators||Programmable||Not Programmable|
|Alternate character ROM||Socket for OEM-supplied character ROM||Down-line-loadable character set|
|Screen freeze||NO SCROLL key||Hold Screen key|
|Printer port connector||25-pin||9-pin|
|Screen refresh||50/60 Hz||60 Hz only|
|Set-up||Display in set-up "bits".||Display in three different languages. Different display. Has no effect on software.|
|RIS function||Performs power-up self test||Does not perform power-up self test|
|Off-Line/local mode||Off-Line mode disconnects modem.||Local mode does not disconnect modem.|
|Communication||Full duplex and half duplex||Full duplex only. Does not affect software.|
|Transmit speed limit is 60 characters/second regardless of baud rate.||Optional transmit speed limit is 150 characters/second.|
|Passive or active 20 mA is selectable.||Only has passive 20 mA.|
|Terminal ID||Responds to primary device attributes with
You can select the DA response in set-up. The standard VT220 response is
CSI ? 62;1;2;6;7;8;9 c
|Secondary device attribute not supported.||Responds to secondary device attribute with
CSI > 1;Pv; 0 csequence.
Pv is firmware version number.