You can look at the source code for Appler and read all about the history of it on GitHub: https://github.com/zajo/appler
Now try writing some code for the Apple II!
- Write in BASIC
- Or try assembly!
And of course, archive.org has a huge library of Apple II books, software, and other goodies. Just search for "Apple II" and see what you can find.
Apple II Software:
DOSBox - Don't forget, now that you have DOSBox you can run all kinds of old DOS software.
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