Simplify the following text for a Grade 10 native English-speaking person.
Original: An adapter was later released in 1983 allowing it to play all Atari 2600 games , using the more reliable controllers from the 2600 .
Simplified: However , a revised 2 port model of the 5200 along with an Atari 2600 game adapter was released in 1983 , allowing it to play all Atari 2600 games .