See also section 3.1.1.3 on EPP upgrade software.

[C] From: Martin Ramsch 
Date: Sat, 3 May 1997 21:50:17 +0200 (MET DST)

Hello!

As you might know, I have the parallel port version of Iomega's Zip
Drive and tried to get fast EPP transfers with my Aero.

I don't have much hopes anymore of getting it to work.

The facts as far as I know them are:

1) There exist two slightly different EPP standards:
   a) 'old style' EPP aka EPP 1.7
   b) IEEE 1284 EPP 1.9

   For further details you might have a look at the manual of the
   "parallel.exe" utility
   <URL: ftp://ftp.mcc.ac.uk/pub/micro-controllers/PIC/ >
   or see
   <URL: http://www.fapo.com/ieee1284.htm >.

2) Our Aero has an IEEE 1284 EPP 1.9 style parallel port.

   Compaq Technical Support answered me:
   | Correct Compaq used EPP 1.9 for the LPT port of the Aero.  Compaq
   | does not offer a special driver to convert this backwards to 1.7,
   | sorry.

3) The Zip Drive software (and hardware?) only supports EPP 1.7.

   I called Iomega's European hot-line and they seem to be quite
   competent.  Unfortunately they told me, that it's actually EPP 1.7
   only.  And there won't be any futher development (at least for Win
   3.1, that's what I asked for).

   And Iomega European Technical Support, Ireland, answered me by
   email:
   | Ihre Nachforschungen stimmen. Es funktioniert nicht mit EPP 1.9.
   | Wir senden keine Source-Codes aus.
    (Your investigations are right. It doesn't work with EPP 1.9.
     We don't send source codes.)

   BTW, beside the ASPIPPM1.SYS driver (with *.ILM files) there also
   exists an ASPIPPM2.SYS driver (with *2.ILM files), but I tested
   all of them and it doesn't help either.


==> Conclusion: we're stuck with byte or nibble mode. 
                (at least for Win3.1, not sure about Win95)

I hope with this article I can save someone all the time I spent on
figuring out the details ...

Regards,
  Martin