IBM 15pin to Apple 9pin Joystick Adapter
This is the assembled form of the IBM 15pin to Apple 9pin Joystick Adapter by Tom Arnold of philosophyofsound.com. It allows the use of an “IBM” Joystick (DB15) on the Apple II computer (DB9).
Comes with all connectors and parts necessary. You only need supply solder and an iron. It's a very simple to assemble project that even a novice can complete.
Pics, Install Guide, and Support are there also.