Thanks for your answer.
I wil try to get this bios file.
But I have found another strage thing.
In the Vectrex emulator when I try to open a file the list remains blank.
And I have put some roms in de H:\emulator\vectrex\roms and H:\ROMS\vectrex
The screen turns blue and the logo of the vectrex sits in the bottom right corner.
If this is not the case in yours, I think the gameta and the k3 are not fulle compatible