Cancel Buffers; Hex Transparent Control - IBM 6400 Setup Manual

ENABLE means the printer will send an acknowledgement to the host
when it is able to accept more data.
NOTE: When an Early Print Complete is enabled and an error occurs, the
data in the printer will remain in the buffer (regardless of the setting
of the Cancel Buffer option). It is recommended that local
procedures be followed to recover from the error.
NOTE: Do not select Early Print Complete while a print job is in progress.
If this is done you will need to restart the printer.

Cancel Buffers

CANCEL BUFFERS has the following options:
ENABLE (the default) cancels all buffers when a job is put on hold from
the host or when the Cancel key is pressed.
DISABLE clears the coax internal buffer, not the print engine buffers,
when a job is put on hold from the host or when the Cancel key is
pressed.

Hex Transparent Control

You can enable additional features that are not available in standard IBM
emulations. To access these features, send lead–in character text commands
in the data stream. You can also use ASCII codes 80 hex through 9F hex as
control codes if configured to do so.
Lead–In Characters
The Lead–In Character commands must have a start and end code. Set 1 is
the factory default. Three sets (each containing a start and end code) are
available:
Set 1: start code =
end code =
Set 2: start code =
end code =
Set 3: start code =
end code =
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Chapter 4. Configuration Menus 4–33