Sunrise is a third party producer of Atari 2600 games. They were a tiny company compared to others from that time. Their first game, Quest for Quintana Roo, is considered one of the best games for the 2600, They only made one other Atari game after that. Telegames later bought the rights to their titles.
You can still order their games brand new from the website at www.telegames.com
Sunrise Atari Titles