MPE/iX Intrinsics Reference Manual (32650-90905)

158 Chapter5
Command Definitions (FCONTROL - FLOCK)
FDEVICECONTROL
AEOR character.
41 Subsystem break character:
Specifies the character is to be used as the subsystem
break character. This value is passed in the high order
byte (value * 256) of
buffer .
If issued to a terminal connected through PAD, the new
subsystem break character is recognized by the host, but
the terminal user has to press
RETURN following the
subsystem break to signal the PAD that data is ready to be
transmitted.
51 Set typeahead mode:
Enable or disable typeahead mode:
0
Disable typeahead mode; accept read data from the device
as it is posted. The terminal user must wait for a new read
to be posted before entering additional data. (default)
1
Enable typeahead mode; pass read data from the device to
a typeahead buffer (up to 224 characters). The terminal
user can enter data before a read has been posted.
Typeahead is not supported on PAD terminals. If issued
for a terminal connected through PAD, CCE (2) is
returned, but the device control action does not occur.
52 Form feed in output data:
Specifies whether the form feed character is replaced in
the carriage control of terminals:
0
Replace form feeds with a form feed replacement character
1
Form feed allowed
53 Define form feed replacement character:
Specifies the character that replaces the form feed
character in the terminal carriage control when form feed
replacement is enabled. The form feed in carriage control
is replaced; form feed in data is not replaced. A default of
NUL is used if form feed replacement is enabled and no
replacement character is specified.
55 Backspace response action:
Selects the action the DTC takes when it receives a
backspace character. Valid values are: