Asynchronous Serial Communications Programmer's Reference Manual (32022-90052)

Chapter 8 217
Intrinsics Reference
FDEVICECONTROL
52 Form feed allowed in output data.
This directive enables and disables the substitution of
the form feed character in the output stream. If buffer
is 1, the device driver does not substitute the form feed
character when it is encountered in the carriage control
of terminals. If buffer is 0, the device driver
substitutes any form feed characters encountered in the
carriage control of terminals with form feed
replacement character.
53 Define form feed replacement character.
This directive specifies the form feed replacement
character. The low order 8 bits of buffer contains the
new form feed replacement character. Note that form
feed in carriage control information will be replaced;
form feed in data will not. NUL is the default form feed
replacement character.
55 Select backspace response action.
This directive specifies the action the DTC will take
when it receives a backspace character. The valid
values for buffer are shown below:
1 remove character from input and back
cursor up one space
5 remove character from input and erase
character backspace, space, backspace)
If issued against a terminal connected via PAD, DTC
Telnet or VT, this call will return a CCE condition code,
but the device control action will not occur.
56 Specify data bits per character.
This directive specifies whether 7 or 8 bits will be used
for each character. If buffer is 7, then 7 data bit
characters are used, and the current parity setting
(directives 9 and 11 or FCONTROL(36)) controls parity
generation and checking.
If buffer is 8, then 8 bit characters are used, and parity
checking is disabled. The current parity setting is
reenabled if you switch back to 7 data bits.
If issued against a terminal connected via PAD, DTC
Telnet, Telnet/iX or VT, this call will return a CCE
condition code, but the device control action will not
occur.