The Interton VC 4000 was quite popular in Germany. Interton produced a serie of pong systems before releasing the VC-4000 in 1978. The console is quite obscure outside Germany, but many "software compatible" systems can be found in many countries (at least in Europe). It's unclear if Interton really made the VC-4000 from scratch or if they bought the rights and the design to produce it, as many other brands produced similar systems the following years. The same thing will happen with very similar systems: Emerson Arcadia 2001 & "clones"...
According to the excellent research work from Dale Hansen, the 1292 Advanced Programmable Video System from Radofin would be the first member of the line as it was released in 1976! Radofin then licenced its system wordlwide to different companies.
The VC-4000 is powered by a Sgnetics 2650A CPU (same as Arcadia 2001) and a Signetics 2636 Video Controller (Arcadia 2001 uses a 2637). The two controllers are composed of a 12 keys keypad, 2 fire buttons and an analog joystick. On the control panel of the system, one can find an on/off switch and three buttons: RESET, SELECT and START.
One particularity about this videogame "family" (VC-4000 & clones), is that they seem to be the only systems which required the game to be loaded into internal RAM from the cartridge, before being able to play (generally through a LOAD PROGRAM or equivalent button found on the control panel. On the VC-4000 it's the RESET button).
About 40 cartridges were released (37 so far). The games are not bad for 1978, but not impressive too...
END OF PRODUCTION
BUILT IN LANGUAGE
Two controllers with 12 buttons, 2 fire buttons and an analog joystick
Signetics 2636 (Video controller)
Single channel beeper
Video output, Cartridge slot, Two controller connectors