Unfortunately I haven't found any background information about the computer itself other than its name "Wagner WAG.40"...
The Wagner WAC-40 was a mid range computer (mini computer) (MDT - Mittlere DatenTechnik).
The story of Wagner Computer is not a success story - mostly because Wagner was not interested in building (good) computers but in making money easily und fast:
Do you already have a plan, how to read-out the software on your rope memory board?
I noticed the quotation has a line your post don't show... curious.
No, I don't have a plan to read the memory. I bought it for static display althought I was fully aware that the content is non-volatile, unless read (this kind of memory has destructive read, right?). So bad I don't even know the word size for it... The matrix is 128-bit but I don't know if it is 16 cells x 8-bit or 8 cells x16-bit. The required voltages are written on the board, so I imagine I could power it. Sounds funny but I have an overhead of months and will have to wait.