I recently purchased this Texas Instruments Ti99/4A cartridge from a well known auction site. Love the cover art. As far as I am aware the game has nothing to do with Donkey Kong, but I can’t test it out as my Ti994A doesn’t work
The manual Introduction states that:
You are an explorer searching for riches on the legendary Treasure Island. Ruby lamps and golden crowns lie within reach. Suddenly the island begins to sink! Your only chance for survival is to climb to the top of the island before it’s too late, grabbing as many treasures as you can along the way. But beware! Monsters and gorillas, falling boulders, and poisonous skulls are a constant threat. Every step could be your last in this exciting one player game of narrow escapes and sudden danger.