ADDS VT220
 |
This article requires additional photographic illustration — pictures with the original keycaps. |
| Model no. | ADDS VT220 |
|---|---|
| Part number | 3413-K455-V001 |
| Manufacturer | NMB |
| Layouts | LK201 |
| Keyswitches | Hi-Tek Series 725 |
| Interface | AT, ADDS |
| Rollover | 4-key rollover |
The ADDS VT220 is an OEM ADDS terminal keyboard using NMB Hi-Tek 725 switches. The switches are white 2 eye linear switches for all switches except the spacebar, which uses a green 2 eye switch. This layout is similar to the DEC LK201 and likely a clone manufactured by NMB.
Protocols
This keyboard uses both the ADDS protocol and the AT protocol. Switching between the two protocols is done through jumpers located on the PCB.
For the ADDS protocol all jumpers have to be present in JP1-JP4 also known as pulling mode.
For the AT protocol all jumpers have to be present in JA1-JA5 PC/AT Mode. Note: Not all keys work under this mode as per not all of them have assigned codes for them.
Gallery
NOTE: The keycaps depicted here aren't the original set (the keyboard came originally with a Spanish keycap set) and neither is the cable.[1]
Top
Switches
Bottom
Back label
Cable exit
Markings on the case
Controller chip
Internal cable connector
NMB signature on the PCB
Protocol switch markings
Switch profile
References
- ↑ Deskthority — ADDS VT220 Posted 2019-01-24. Retrieved 2024-07-05.
