What year is a Massey Ferguson 285 with a serial 9A269236?

Since the 1977 model serial numbers start at: 9A254045, and the 1978 model numbers start at: 9A276935, my best guess would be that your MF-285 is a 1977 model.

Source page:

http://www.tractordata.com/farm-tractors/000/7/7/775-massey-ferguson-285.html