I have taken Eric Smith’s disassembly of Apple 1 Basic and made it build-able with an Assembler called DASM.  But there is more,  I have compared the object code with 5 published versions of Apple 1 Basic and modified the source so that any of 4 slightly different versions can be built.  At some point, when I get a better understanding of what the differences functionally accomplish, I’ll document and put a page up on my web site.

This work is derived from Eric’s original disassembly, Eric has been gracious enough to allow me to distribute.

http://www.willegal.net/appleii/a1basic.asm

I understand that there are likely to be more versions out there, as Apple 1 basic was a work in progress during the life of the Apple 1 and WOZ distributed improvements as time went on.