Run Turtles. The game is cracked so type any random four numbers for the password screen. Select Tandy for Sound Card and Tandy for Graphics Card. Then select your controls of choice.

The game was not patched to support Tandy 3 voice sound, but it does so automatically. No need to run sound3v. The only issue I ran into was quitting to DOS. My speakers started emitting a loud hum when I did, forcing me to restart the machine.

Unfortunately, the game also runs slow as molasses on a 4.77 MHz PCjr, even in fast ram. I imagine it runs more acceptably on a sped up 8 MHz jr. But even with the slow speed, missing frames, and laggy and floaty controls, the game looks impressive on the old jr, so I'm including it here. I mean, playing the original game at the arcade in '89, I never would have imagined a port this close to the original running on my jr in any capacity. And this port came out in 92! 

I will also note that I played this game using a 640 kb jr, with the game running in 510 kb of fast ram. This is well below the game's requirement of 640 kb. It crashed after the first level with a low memory warning. I imagine with a Jr-IDE and its 736 kb of ram, you would get much further, if not to the end, using fast ram. I doubt anyone would want to get that far, especially if they have a slow machine, but it takes all kinds.