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SCNSER seems to have a few problems with TECO when it is switching
terminal modes quickly:
1) With EVOFF$ and an FC command table set up, TECO turns the
echo (IO.SUP) off for the first character (at least) of each
command. Without TTY DEFER this understandably just messes up
if the user types too fast, however, even with TTY DEFER, it
is still possible to have characters which TECO does not input
until after it has turned echo back on. Easy way to see
this is to set up an FC table and then type ahead a complete string
that is not an immediate command.
2) The TECO macro ITECO has an immediate mode insert command. When it
is in this mode, it has a control-R command to cause the next character
to be quoted. To do this nicely, it sets the terminal into packed
image mode (:-3^T), gets the character with an ^T, then clears packed
image mode. There are a few strange things which can happen when this
is used. If an ^R^C is typed, at times it seems that SCNSER gets out
of sync by a character, and is not giving TECO a character until the
next character is typed. If an ^R^T is typed, it seems to become
totally confused, putting the job into monitor mode but ignoring
commands. I don't have an example of how to make this happen, but
would appreciate it if you have any ideas as to what happens with it.