Well i got help on how to wire a discrete joystick to a DB9 pinout, with proper wiring, to run on Intellivision. and like to shsre it with other SRKers.
If you have a modern fight stick and come across an intellivision you might want to make an INTV adapter. Why?
The Intellivision is probably the worst default controller for twitchy arcade games. Just google “Intellivision controller complaints”, we which has recent posts because of the Intellivision Amico coming on 10/10/2020. people say the joystick design of the original Intellivision is so famous, it’s infamous.
Yes more complex games do work somewhat better an intellivision compared to its contemporaries , but at the cost of arcade twitchiness.
Based on the schematics no programming is necessary on the joystick end itself. All you need are a lot more water than usual and ask a few logic chips to make sure diagonals do not become tertiaries.