All that matters is whether the laptop supports cardbus specs. I had an Omnibook 800CT, with a P133 processor, cardbus enabled ports, under win98 and it worked fine with the two modern cardbus wireless nic's I had; one was a neatgear and the other some cheap generic taiwan brand. Cardbus started being common around the P166 era. In some older laptops, you may have to enable cardbus within the bios. You can easily check if your system supports cardbus by looking into the device manager -- look under PCMCIA devices and you should see the driver loaded, it will specifically state cardbus somewhere in there.