I found the following information on this web page (thank you lincomatic for the write-up!) and updated the information.
"...the DWL-121 - which is not listed on D-Link's website. OmniMedia's support claims that it's a special model that only works w/ OmniFi products ... (yeah, sure, I believe that...) Is it possible to use it as a WiFi adapter for a Windows XP computer? The answer is yes... with the right driver and a tiny bit of tweaking...
D-Link doesn't provide drivers for the DWL-121, and doesn't even have any information about it on their website. When you plug it into a Windows computer, it comes up as an unknown device, manufactured by Inventec. The USB Vendor ID is 09AA, and the Product ID is 3642. Since Intersil's Prism chipset is one of the most popular, I took a guess that the DWL-121 must be Prism-based.
I went hunting for drivers on D-Link's site, and found that the driver for the DWL-122 - another USB WiFi adapter - is called PRISMUSB.sys. Good candidate. After modifying the INF to look for the correct VID/PID, I got the DWL-122 driver to install and it worked! I'm actually posting this article through the DWL-121 right now! Below is the installation procedure:
If you have any more questions or something is not clear to you, just come back here and leave a comment - I'm happy to help.
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