Thanks for your reply this is highly interesting to me. I'm almost positive i have a
DIN 5 female to mini-DIN 6 adapter at my parents, we have an old computer with an old keyboard and i remember having to put this adapter as a kid.
Here are a few more pictures of the keyboard. I opened it this morning to share a more detailed overview with you.
Here is a clearer top view of the keyboard and the DIN 5 connector :
This is a clearer view of the weird "RCA"-likeconnector :
Here is a picture of the back of the keyboard :
Here is a picture of the front side of the PCB, with the keys :
Most likely the keyboard firmware runs on the DIP MCU (i forgot to take a picture of the reference) ?
Here is a picture of a switch :
And here is the back of the PCB, where the weird connector was soldered (on the "*" key) :
And here is where the joystick was soldered :
We can see that it is soldered on the arrows, and the enter key. We can't see it on the picture, but the longest cable is soldered on space.
For now i simply removed this joystick because i don't have any use of it and it is just taking room for no use.