To have Opie 1.0 on an iPAQ, you have to install a Familiar + Opie image on your iPAQ. An image is in fact a file, containing the memory image of an iPAQ with Familiar (the linux distribution) and Opie (the graphical platform) installed. You can download it from the Internet, then load it in your iPAQ through a Compact Flash card, serial port or USB.
To start with, go to the Familiar download page.
Put the model of you iPAQ under "Please select your hardware", choose testing, v0.7.1 as the Familiar version, and Opie as the set of files, and press Download.
Follow the Familiar installation instructions then, to know how to upload this image file on your iPAQ.
Configuring a network connection for the iPAQ is then very useful, in order to install new packages, or upgrade existing ones (to get new features or bugfixes, for example). The Familiar site provides instructions for connecting the iPAQ to the Internet in a variety of ways. See this iPAQ networking tutorial to have information on configuring PPP or USB, and masquerading (giving access to the Internet through your PC), for example. Setting up masquerading is even simpler on Windows, if you can adapt this kind of tutorial for Windows.
When your iPAQ is connected to Internet, you can and should do several things, in command line, using Familiar, as noted in the Familiar post-install page, or using Opie applications.
For example you can synchronize the iPAQ clock with network time servers. There is a graphical way to do that through the Settings / Date/Time Opie application, or you can also run as root the following command:
ntpdate -b time.handhelds.org
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To teach to your iPAQ what are the new packages or updated packages it can dowload, run the command (as root again):
ipkg update
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To download and install automatically new versions, if they exist, of your installed packages,
ipkg upgrade
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Opie applications will install and run on the default Zaurus ROM (Linux-based distribution, as well as Familiar) with no problems,except for Launcher. It is not compatible with the default ROM, and should not be installed. You should be able to find the fine Opie packages for you Zaurus default ROM at this feed address: http://opie.handhelds.org/feed/sharprom/.
Another option is to replace the default Zaurus ROM with the OpenZaurus ROM image. OpenZaurus is a openly developed Linux distribution designed to run on the Zaurus, and uses Opie as its default user interface. For more information and installation instructions, please visit OpenZaurus.org web site. Notice you will access the Opie 1.0 feeds at the address http://opie.handhelds.org/feed/openzaurus/.