Intellivision Tennis for Atari 8-bit attempt

Intellivision Tennis (1980) by Gavin Claypool is one of the best tennis games of its era: forehand/backhand/ground/lob shots with direction based on when the ball is hit, 16-directions players movement, hard/soft/outer/center/inner services, faults/out of bounds, nets/lets, 3/5 sets with tie-breaks, court change.
In 2019 I gave it a try to convert it to Atari 8-bit computers but a good programmer is necessary.