When writing a program for an encryption machine, a paper model is a must. This allows you to see the correct values of all the intermediate steps for a given input.

You can download an excel file here that simulates the signal path through the rotors

The assembly file already implements the signal path through the 3 right rotors. The next step is to write code to go through the reflector and come back the rotors.

https://github.com/arduinoenigma/Mystery6502Machine