Run BONDT to force the Tandy 1000 version on a PCjr. 

At first glance, the game will appear to run fine on a 4.77 mhz PCjr using fast ram. However, you'll soon encounter an insurmountable problem: your helicopter exploding for no discernable reason. That's because the frames of animation featuring the enemy bullets are being skipped. I don't know if a PCjr sped up to 8 MHz would fix the problem, because I don't have one to test. But if you do, let me know. As for now, the game is only included as a curiosity.