Richard,

Richard PALO wrote:
> Well,  after installing the postscript driver found on the HP site on windows 
> (its was only PCL before), I printed the webpage with duplex 'on' to a 
> postscript file [attached]...
> 
> does this give any more indication?

The postscript file (hp2840-windoze.ps) from ms windows seems to have 
the following stuff in it relating to "Manual Duplex" ....

   @PJL SET MANUALDUPLEX=ON
   ....
   ....
   featurebegin{
   %%BeginFeature: *HPManualDuplexDialogItems
                   InstructionID_01_FACEDOWN-NOROTATE
   %%EndFeature
   }featurecleanup
   ....
   ....
   featurebegin{
   %%BeginFeature: *HPManualDuplexDialogModel Modeless
   %%EndFeature
   }featurecleanup
   featurebegin{
   %%BeginFeature: *HPManualDuplexPageOrder EvenPagesFirst
   %%EndFeature
   }featurecleanup
   ....
   ....
   featurebegin{
   %%BeginFeature: *ManualDuplex True
   %%EndFeature
   }featurecleanup
   ....
   ....
   ....


I'm wondering if its the PJL (Printer Job Language) line at the top of 
the ps file that actually makes it work in "Manual Duplex" mode on MS 
Windows.

Have you tried sending that ps file to the printer on your solaris box ? 
Eg. ...

   > dos2unix hp2840-windoze.ps hp2840-file.ps
   > lp -d myprinter hp2840-file.ps

and does it work "Manual Duplex" then?

If it does you could try removing the PJL line and see if it still works?

If that still works, try removing all the HPManualDuplex* features lines 
from the file, leaving the '*ManualDuplex True', and see if it still 
prints in "Manual Duplex" mode ?

Paul


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