Epson printers on the Sun
Paul Leyland
pcl%robots.oxford.ac.uk at nss.cs.ucl.ac.uk
Wed Dec 21 19:07:37 AEST 1988
trwspp!spp2!sol!rroux at cs.ucla.edu says:
> I have a Sun 3/50 running SunOS 4.0 and I've attached an Epson FX-80
> printer to it via a serial-to-parallel converter....
> It basically works, except that data at the end of the file that's being
> printed is usually lost....
Yep, we had a similar problem with our Epson EX1000 (a very similar
machine, just a bit newer with a wider carriage). We fixed it when we
noticed that the ready light wasn't flashing as expected. The trouble
was that the XON/XOFF handshaking didn't. The following printcap
entry fixed it and has given us completely reliable communications
since.
____________________
# Epson EX1000 over a tty line.
lp|epson:\
:lp=/dev/ttyb:\
:br#9600:fc#0177777:fs#0000002:xc0177777:xs0040440:\
:tr=\f:of=/usr/lib/lpf:lf=/usr/adm/lpd-errs:
____________________
The downside is that we cannot now use 8-bit (RAW mode) communications
which makes graphics a bit trickier. One day, I'll get round to
writing a filter which sets the interface in RAW mode and handles
XON/XOFF coming from the printer, but never meddles with any character
going out. Why can't the UNIX tty driver provide such an environment?
Surely it must be useful in other circumstances.
Hope this solves your problem.
Paul
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