mostly, just edit /sys/lib/lp/devices and start the network listener.
for the former, the "pcclone" entry should be pretty close to what you
want, although if it's a dot-matrix printer, you almost certainly will
want some other device class for your dot-matrix printer (unless
ghostscript knows how to drive it, you're likely just going to get
text via noproc). for the later, likely just remove the ! from
/rc/bin/service/!tcp515 if you're already running aux/listen (as on a
cpu server); otherwise inspect its contents for handing to
aux/listen1.
