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jack, if you want to develop your own emulator based on an existing open access, the forum has enough material.
Development of any version is years of labor.
3.9 version is well done to continue working on the emulator.
if you have extra years that you are willing to spend on this job, then you will succeed.
do not forget to post your work openly for everyone(joke)
Of course, for the sake of convenience, I still need help. When the 3.9 server is really stable, I will post it to this community. thanks for your encouragement