Here is what you do.

Forget about the assembly, most likely will not work for you.
From the zip you provided.
I have tested this only with 1227747 ECM but it should work also with other 160 baud units after you have verified / altered ALDL data stream decoding to match with your application.
You can blink an LED and make a LCD work. Learn about serial communications and write you own code. Then you can say that PBP paid for its self.

Seems like the trick is in finding the protocol.