I will nominate as "the first manuscript created on a microcomputer
wordprocessor":
the documentation of ESP-1 ("Extended Software Package 1") by Michael
Shrayer. (to do so, he created "Electric Pencil")
He very well might not have been the first to do so, but it is well known
to be the "FIRST" microcomputer word processing program.
As to "the first best-selling published book created on a home
computer word processor by a major mainstream author", I have no idea.
The "major" "mainstream" "best-selling" have boundaries that
are too
vague. Even the definition of "book" is poorly delineated. And, since
there aren't any records for any of the multitudinous lesser works that
had already been done, I object to calling it "the first book created on
a word processor".
Almost all "FIRST"s are fundamentally flawed.
They almost always ignore similar prior accomplishments
by relative unknowns, and they hardly ever clearly define
WHAT was done "FIRST". Often, there are unstated further
requirements, such as only looking at the major brands, or
only considering ones that were major commercial successes,
or only accomplishments by people in "Who's Who".
On computer products, does "FIRST" mean first announced,
first shown, first available for sale, first sold, first
shipped, first delivered, first in stock in stores, etc.?
First announced is often not first delivered, etc.
Elisha Gray experienced the issue of "first invented" V "first
filed".
--
Grumpy Ol' Fred cisin at
xenosoft.com