ADDS VT220

This article is a stub. You can help Deskthority by expanding it.

ADDS VT220

Error creating thumbnail: File with dimensions greater than 12.5 MP
Model no.	ADDS VT220
Part number	3413-K455-V001
Manufacturer	NMB
Layouts	101 Key ISO
Keyswitches	Hi-Tek Series 725
Interface	AT/ADDS
Rollover	4 Key Rollover

Summary

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

• Error creating thumbnail: File with dimensions greater than 12.5 MP
  Top
• Error creating thumbnail: File with dimensions greater than 12.5 MP
  Switches
• Error creating thumbnail: File with dimensions greater than 12.5 MP
  Bottom

References

<ref>https://deskthority.net/viewtopic.php?f=62&t=20868</ref> <references />