As mentioned before , i made a functional copy of the Tektronix 4052 Diagnostic Rom Pack . PCB's are back, units do work ( minus a small issue with the wrong orientation of the LED's ) Go to ftp://ftp.dreesen.ch/TEK_DRP ?and find my dokumentation DiagPack_Manual.pdf , decide if this is what you want, and order ( or not...) Also please read the original TEK doku TEK4052_4054_Diagnostic_Rom_Pack.pdf in order to understand what this unit can and cannot do. Prices, in short : PCB only 20 Euro/25 USD, populated and tested 60/75, add 20/25 for a fitting 3D printed casing. And do feel free to construct your own with the data from my FTP site. This pack should also work on the 4054, but since I do not have such a machine this feature is untested. Jos, now wondering whether I will ever sell the 20 PCB's I have...