HP printer 670c and windows95 : failing bi-directional communication,
   using 'ecp' ( parallel port as 'enhanced capabilities port' ).
   main problem: nonsense error messages
   it took me 2 weeks to get this printer working properly.
   hp helped only as far as 'the printer is not the problem'.

   ( mainbord:        chaintech 5TDM2
     chipset:         intel 430tx
     bios:            award 04/21/98 
     windows version: 'osr2' )

   this is how i finally got it right:
   
     prepare: windows95 software
              hp software ( floppies or from the net )
              'ieee 1284' - printer cable
              ( i still do not know if this cable is crucial,
                the difference with a normal cable is small )
   
     --- the cleaning part:

     remove printer(s) from control-panel/printers
     delete manually all hp-software ( all files starting with hp.. ) from
       windows- and system- directories
       (or move it somewhere if you are not sure)
     remove lpt1-port in device-manager              ( ! )
     switch computer and printer off

     --- the building part:

     put cable in place
     start computer, go in bios setup
     look for 'integrated peripherals', lpt1
     select ecp ( 'enhanced capabilities port' )
     save + exit
     windows starts, finds new hardware:
       1: the port: 
          select the driver manually, look on the windows cd:
          drivers/prntr/lpt there is: lpt.vxd, version ....503?
          do not take the one in the 'cabs' ( version ....950? ).
          (windows is vague here about the driver,
           it says: 'no driver needed or loaded' or so.)
       2: the printer:
          tell it where the software is.

     now it should work.
                                               jasper, amsterdam 9904

     PS
     oops, it did not.
     disabled bi-directional communication via the hp-configuration
     program. i hope the thing keeps working now, but it is not what i
     call 'working properly'. if anybody has some answers... 
     
     PS2
     it did not.
     the answer is: keep calling hp-support until they give you a
     replacement. we did it as a team: the owner to talk to the management
     and me to talk to the technical people. prepare for some hours on the
     telephone.
     
     i still would love to know what really happpens, i suspect the
     contacts of the cartridges. 
 
     feedback: rjnoe@xs4all.nl