ROM text:Power Tennis
From Game Developer Research Institute
19;SEP;91
NOW;IMI
Some text from the end of what appears to be a debug or test mode, which may or may not be accessible through the game. "NOW" likely refers to Now Production. "IMI" likely refers to the programmer (credited as "Kimi" here, "Ganma Imi" on Youkai Douchuuki (FC), and "Mimi" on Dragon Saber (PCE) and Dig Dug (GB)).