QMS JetScript
-------------

- One ISA board in the computer, one special board in the
  HP LaserJet series II laser printer and some driver software
  together takes control over the printer and turns it into a
  Postscript printer visible as as LPT1,2 or 3, and also as the
  device name EPT. The ISA board has 2 or 3MB RAM fixed installed.

- With JetScript installed there are two possible printing options:
  o Sending PCL via the regular serial or parallell port.
  o Sending Postscript to the JetScript controller using a
    parallell port name and/or EPT.
  When sending to both ports at the same time the printer will
  print them after each other. It will not cause an error, but
  possibly a timeout.

- Works with Win95, I used Apple LaserWriterII NT driver and it
  worked fine. I had to add the port EPT myself under printer
  port settings.
                                                          .--
 .-------------------------------------------------------.|
 | #  #  #  #  #  #  #  #  FCC ID: E7S5JALCPH001     1.. || 
 |   6 rows x 16 columns                              JP1||
 | #  #  #  #  #  #  #  #              .----.            || 
 |   of RAM chips                      |68  |          .--|
 | #  #  #  #  #  #  #  #              |000 |          |  |:
 |                         .----.      `----´          |  |:
 | #  #  #  #  #  #  #  #  |ADOBE                      |  |: 37pin
 |                         |    |                      |  |: female
 | #  #  #  #  #  #  #  #  `----´  J1      JW1         |  |: dsub
 |                        QMS    1...     1...         `--|=
 | #  #  #  #  #  #  #  #  .---------mmmmmmmmmmmmmmmmmm....<-- JP2, JP3
 `-------------------------´         """"""""""""""""""   |
                                                          |

   .---------------------.|
   | ASSY NO 5157444   .--|=
 ==                    |  |:
 ==                    |  |:
 ==    .---.           |  |: 37 pin
 ==    |   |           |  |: female
 ==    `---´           |  |: dsub
   |     : JP1         `--|=
   `-----1---------------´|


Install the adapter card in the interface slot behind a metal
plate next to the serial port on the HP LaserJet series II printer.
The card should be upside down, the components facing down.


J1:  Port selection. 1-2 = 378h, 2-3 = 278h, empty = 3BCh.

JW1: IRQ selection. 1-2 = IRQ7, 2-3 = IRQ5, empty = no IRQ.
   If selecting "no IRQ" the manual says that "the reverse
   channel must be closed to ensure dependable communication".
   This is done by sending the following to the printer once,
   in lowercase exactly as shown (^D is the ctrl-D control char):

serverdict begin 0 exitserver
statusdict begin 1 setdefaultparallell 1 setparallell
start
^D

   With the reverse channel closed you cannot download Adobe
   Soft Postscript fonts. Some other features are also disabled,
   and software that writes directly to the port hardware may
   cause lockup problems. To re-open send the same script,
   but with "0" instead of the two "1".


CONFIG.SYS:

  DEVICE = C:\QMS\JETSCRPT.SYS -Px -Ix -Lx

  -Px = port address. P1=3BCh, P2=378h, P3=278h.
  -Ix = interrupt. I1=IRQ7, I2=IRQ5, I0=no IRQ.
  -Lx = LPT port. L1=LPT1, L2=LPT2, L3=LPT3.

  example: DEVICE=C:\QMS\JETSCRPT.SYS -P1 -I1 -L1


AUTOEXEC.BAT:

   CD \QMS
   JETSTART


Cable pinout: (37pin male dsub <-> 37pin male dsub)
  2 - 21, 3..14 - 3..14, 21 - 2, 22..33 - 22..33, shield-shield.
  (not connected = 1, 15..19, 20, 34..37)
  The manual says that the cable has "twisted pairs", so it MAY work
  with a completely straight connected cable (1-1..37-37), but my
  cable was not like that.
  
/Tomas Andersson 1994, 1999.