Date   : Sat, 02 Jul 1983 22:25:00 EDT
From   : Keith Petersen <W8SDZ@mit-mc>
Subject: modem7 ASCII capture flow control

You asked some time back if MDM7xx does anything smart when in the
CONTROL-Y mode.  It sends an X-OFF and then buffers up to 128 MORE
CHARACTERS while it waits for the other end to quit sending.  It then
writes to the disk and then sends X-ON after resetting its pointers to
the start of the buffer.  The file is not closed until you issue the
WRT command from the command prompt.  This allows almost unlimited
size ASCII captures.
--Keith