Air Buster (Genesis)

Unused Checksum
Located at is programming to run a checksum and compare the result to the value stored at, which is seen in many Genesis titles. In this game, it's branched over instead. Even if the block of code were to execute, the branch that determines the checksum status was replaced with a two NOP commands.

Unused Configuration Mode Branch
The Configuration Mode has 7 available selections, but the jump table that executes the code for each includes an 8th branch command that goes unused. It's located at in Aero Blasters (Japanese version) and  in Air Buster. It branches to the same address as the previous entry, which is the programming to exit Configuration Mode.