Partially related to that is a program called ?20HAL?
which was a
code uploader Microsoft used in the late stages to get code from
Microsoft in Bellevue to IBM in Boca Raton, FL.
The TOPS-10 manual says that:
(SET) TTY FILL n
sets delay characteristics for the line to class `n`. There's a table
of the number of filler characters sent after each of a number of
different control characters. Class 3 uses the most fillters. The
filler characters used are CR after a CR, and DEL after all the others.
It could make sense to do this during a file transfer, depending on the
assorted endpoints, etc.
De