[Oberon] PSPrinter.Mod

[Bernhard Treutwein]

To the best of my remembrance of PosScript and PS-printers
a Ctrl-D should not be harmful if it is not required, but I am
not shure about it. Ctrl-D signals EOF to the RIP.

It would also explain some problems I had with printing to
a Brother HL-1670N, but I have to check that at work.

regards
--
    Bernhard Treutwein
    BdT (at) wildwein de (home)
    Bernhard Treutwein (at) verwaltung uni-muenchen de (work)

> ----- Original Message ----- 
> From: <shark at gulfnet.sd64.bc.ca>
> To: <oberon at inf.ethz.ch>
> Sent: Friday, April 30, 2004 3:37 AM
> Subject: [Oberon] PSPrinter.Mod
>
>
> > Oberon readers,
> >
> > There is a LaserJet III here with an HP PostScript
> > cartridge and PSPrinter is installed in ETH Oberon
> > / PC Native 05.01.2003.  A test page prints correctly
> > but then "PROCESSING DATA" continues until "PS
> > ERROR 16".
> >
> > The _PostScript Cartridge User's Guide_ explains the
> > error in section 5.8.b.  Quoting briefly, "The
> > control-D must be the last thing sent to the printer."
> > I don't really understand the need for the control-D.
> > Apparently the newer printers at the ETH don't impose
> > this requirement.  In any case, I added the second of
> > these three statements in PSPrinter.Close.
> >
> > Files.WriteBytes(printR, buffer, bufSize-srcR.res) UNTIL srcR.eof;
> > (* End-of-file signal for a LaserJet III with an HP PostScript cartidge.
> *)
> > IF ~P.eps THEN Files.Write(printR, 4X) END;  (* P. Easthope, 2004-04-29.
> *)
> > IF ~P.anonymous THEN Printer.Spool(P.printF) END;
> >
> > A few additional points remain.
> >
> > 1. My understanding of PSPrinter.Mod is cursory.  Is this
> > repair appropriate?  Is there a case where it will fail?
> >
> > 2. Can the decision to insert "4X" be automated by probing
> > or querying the printer?  Otherwise the user must diagnose
> > the problem and recompile PSPrinter.  This is beyond a
> > novice and is inconvenient at best.
> >
> > 3. If the repair can not be automated, the additional
> > statement should be supplied in the distribution, commented
> > out.  Also it should be mentioned in
> > http://www.oberon.ethz.ch/printer.html .
> >
> > Regards,         Peter E.
> >
> >        http://carnot.pathology.ubc.ca/
> >
> >
>