Editing Tandberg Data TDV 5000 Series (section)

== Development ==
Throughout the 80s, Tandberg had reasonable success with their [[Tandberg_Data_TDV_2200_Series|TDV 2200]] series of terminals. These terminals were made with different key-layouts for different customers and use-cases, and some customers also sold their own OEM variety with unique functionality. Tandbergs own variety (TDV 2215) was to a large extent similar to the OEM variety from Norsk Data, where the Norsk Data version had additional keys and functions spesifically tailored for the NOTIS software-suite. NOTIS was a set of workplace applications (word-processor, spreadsheet, etc..) running under the realtime multi-user SINTRAN-III OS for the Norsk Data NORD minicomputers. Towards the end of the decade, a smaller cheaper option was available: the [[Tandberg_Data_TDV_1200_Series|TDV 1200]] series of terminals. Like the 2200 series, these were also available as a Norsk Data OEM variety, in much the same way.

As PCs grew more and more popular, at one point around 1989 Tandberg established the TDV 5000 series. This series did not introduce a standalone hardware terminal, but was rather a series of keyboards designed to be PC-compatible for use with PC-ports of various NOTIS software. All early keyboards in this series has the additional NOTIS-keys, but it is unclear if the host PC needs a special keyboard-interface chip in order to use these. The keyboard firmware tags these with a non-standard 0x80 scancode prefix.

The 1st generation of the TDV 5000 series of keyboards was based on the keyboard of the TDV 1200 terminal. As much of the design was developed from the TDV 1200 keyboard, all of them had TDV 1200 printed on the internal PCB. To ease production, all 1st generation keyboards are fully equipped with all switches, even when (on most TDV 5010 keyboards) the 20 extra NOTIS-keys are hidden under blanks. The first generation TDV 5000 series started out with [[Siemens STB 21]] switches and matching Siemens ABS double-shot keycaps. Later Gen1 boards switched to PBT caps using Helvetica instead of DIN lettering. There might also have been some internal mechanical changes as the branding was changed from "Tandberg Data" and "Tandberg Display", but the colors and shapes still exactly match. Late keyboards of the 1st generation look identical to those of the second generation, except for the additional Windows 95 keys of the latter.

The transition to the 2nd generation must have happened sometime during the years 1996-98: the earliest possible year is 1996, when Cherry ML switches were introduced; the earliest known 2nd generation keyboards are from 1998, when the batches sold at eBay in 2009 and 2011 were made. In 2004, Tandberg Display keyboards were taken off the market.