The only real way is to pony up $70 or so for the IEEE 1284 spec from
http://www.ieee.org The order form is at
http://standards.ieee.org/catalog/orderform.pdf
and the price / partnumber list is at
http://standards.ieee.org/catalog/bus.html#1284.1-1997

There is a pretty complete description of the signals on the techref (see
below). Just fill out the form to get access (no data about members released
to anyone, period, for any reason except law enforcement), and you can add
your own comments, etc...

Please let me know if you have any JavaScript problems with the application
form, its pretty trick and may still be slightly buggy.

James Newton, webmaster http://get.to/techref
(hint: you can add your own private info to the techref)
mailto:jamesnewton@geocities.com
1-619-652-0593 phone



-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@mitvma.mit.edu]On Behalf Of Bad Boy Bubba
Sent: Sunday, September 19, 1999 5:06 AM
To: PICLIST@mitvma.mit.edu
Subject: Digital Data Logger needs LPT specs


Hi,

    Im currently designing a digital data logger to monitor up to three
digital levels using a PIC.  I figure that I can monitor 3 pins send the
data back to a PC via the parrallel port using 8 pins + a couple for
strobes etc.

    But Im having touble with LPT port specs.  Anyone got a good
no-nonse guide to reciving data on the LPT port? Im looking at EPP
rather than SPP because I should be able to get 2Mb/s, but EPP uses
hardware control, I need to know how to make a PIC emulate the hardware
control.

    Cheers,
            Bad Boy Bubba