VT220 Programmer Reference Manual| Chapter 4 | Contents | Appendix B |
Appendix A
This appendix describes the major differences between a VT102 terminal and the VT220 terminal operating in a VT100 mode.
| Difference Area | VT102 | VT220 |
|---|---|---|
| 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 ESC [ ? 6 c sequence. |
You can select the DA response in set-up. The standard VT220 response is CSI ? 62;1;2;6;7;8;9 c sequence. |
| Secondary device attribute not supported. | Responds to secondary device attribute with
CSI > 1;Pv; 0 csequence. Pv is firmware version number. |