Tips? modify assembly code, without any documentation

[cmunikat]

modify assembly

Hello!

How would you proceed in this case?

I have to modify the SW of an equipment. I have an emulator, the functional changes that need to be done, but no documentation at all.

Where would you start to finally release a modified product?

thanks!

 

[elektryk]

It depend on size of changes and what is a purpose of this changes. I sometimes do adaptation for new hardware is original chip is obselete and damaged.