I got this from Futurepedia. It is the letter Doc wrote to Marty while in 1885.

Dear Marty, if my calculations are correct آپ will receive this letter immediately after آپ saw the DeLorean struck سے طرف کی lightning. First, let me assure آپ that I am alive and well. I've been living happily these past 8 months in the سال 1885. The lightning bolt that hit the DeLorean caused a gigawatt overload which scrambled the time circuits, activated the flux capacitor, and sent me back to 1885. The overload shorted out the time circuits and destroyed the flying circuits. Unfortunately, the car will never fly...

Back to the Future یا Whatever
CHRIS is middle aged. He lost his job a few years ago. He’s
been working towards becoming a script writer, movie
producer, and director.
DAVID is from the city. He’s a business man, but wants to be
a movie script writer and director. He likes to joke and
enjoys laughing
STEPHEN SPIELBERG is a serious person.
DOC is a funny old guy who loves the past. He has his old
jokes. He asks many questions.
INT. OFFICE-DAY
CHRIS and DAVID are sitting at a round میز, جدول together. They
have paper and are writing on the paper.
CHRIS
I think this line needs to be cut.
DAVID
But it’s a big...