I am still having problems getting lpd on a 1.1/i386 box to properly
drive a QMS-410 laser printer through the serial port (this worked
perfectly under 1.0).  The printer is set up to interpret postscript
files and the serial port on the printer is set for 9600 bps, no
parity, 8 data bits, 1 stop bit, xon/xoff flow control.  It seems to
respond just fine to communications via kermit, but not to lpd.

My printcap entry is:

qms-410|QMS PS-410 laser printer:\
        :br#9600:\
        :fc#030:fs#0303:\
        :lf=/var/log/lpd-errs:\
        :lp=/dev/printer-ps:\
        :rw:\
        :sd=/var/spool/output/lpd/qms-410:\
        :sh:\
        :xc#0:xs#010010000000:

To me the obvious place to check is the setup of the serial port on
the host.  As understand it, the fc/fs and xc/xs flags are used to set
the flags in the four termios registers c_iflag, c_oflag, c_cflag, and
c_lflag.  I even understand that /usr/include/sys/ioctl_compat.h
defines the various bits that go into making up the flag values.

One thing I don't understand is how the values of fc/fs and xc/xs are
translated to values of the termios flags.  For example, if I identify
some function in ioctl_compat.h that I wish to try, how do I know
whether to clear/set the bit using fc/fs or xc/xs?

Finally, is anyone else using the 1.1 lpd to drive a serial printer?
I don't suspect my printer is particularly unusual, I'd like to see
printcap entries that work for printers using a similar serial
communication protocol.

By the way, this is with the patched 1.1 kernel.

Any help welcome.

Cheers,
Brook