Steven Weyhrich writes:
Years ago I was sent a PDF of the original Apple II Reference Manual, known
as the Red Book. Back in 2008, Gerry Doire had not only provided for me a
scanned version of the manual, but he cleaned it up so it was more readable
and useful as a reference.
I recently received a message from Gary Graham, who has taken Doire's
original files and updated them to fix some typographical errors. He also
fixed the font sizes, and did other work on it. He asked that I replace the
old version with this better version.
It is still a work in progress (still says it is the 35th anniversary
edition), but he has more work he plans to do with it, and will keep me up
to date with the better edition when it is available.
Here is the link:
https://www.apple2history.org/2023/05/01/red-book-revisited/
https://www.apple2history.org/sdm_downloads/apple-ii-redbook-digital-edition-2023/