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Does anyone happen to know where I can find information on Apple II GEOS programming? "The Hitchhiker's Guide to GEOS" has serious errors, & JFGI is completely failing me.

Back in the day, GEOS was so popular that (by one account at least) nearly half of all C64 owners used it. GEOS 128 didn't quite reach the same status but it was still a bit respectable. The Plus/4 & Apple II versions, however, never made it out of obscurity.

I may have found one, & I'm almost kicking myself. cc65 has a symbol table lifted from the Hitchhiker's Guide to GEOS, checked only for fidelity not correctness. But it also uses a few include files for cross-compiling Apple II GEOS programs, which means conflicting addresses *had* to be resolved: github.com/cc65/cc65/tree/mast

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