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I got a 3Com 3C575 for my new 560X because of top-rank benchmarks and the fact that it's the first on Donald Becker's list for 100Mbps CardBus support under Linux. It works beautifully under the preinstalled Win95B (FTP from a Linux box clocked at 77Mbps), but isn't recognized by either NT or Linux yet. I need top speed because I'll be using this box for fast ether packet analysis and such. First Linux, because it's probably easier: Starting from a RedHat 5.0 base (installed over the network, so much easier than NT...), I built kernel 2.0.33 and the latest 3.0.0 PC Card utils from hyper.stanford.edu, with CardBus on. Fetched and built the latest draft of 3c59x_cb from Becker's web site. "Normal" PC Cards including a modem and a cheap NE2000 clone Ethernet card work OK, but the CardBus card Linux won't recognize. No problem with the modules -- I can manually load them into the kernel with no complaints about missing symbols, they just don't talk to the hardware. I think the Linux problem is the TI1150/1250 difference mentioned in Dick Bakker's messages on the CardBus HyperNews forum, but before I hack the includes and rebuild my kernel I wanted to check whether anyone else had tried same. Has anyone been down this road before? Now NT 4.0: First, does IBM/CardWiz officially support CardBus under NT on this model? If not I won't waste any further time on NT, which I'm realizing really sucks on laptops, and just use Linux and Win95. It would be *nice* to have NT on this laptop to facilitate troubleshooting NT-specific networking bugs, but I can get by without it. I installed NT 4.0 (no service packs or hotfixes applied yet) onto c:\winnt (FAT). Added te latest NeoMagic drivers, BIOS update, and THinkPad Utils from IBM's web site. The CardWiz disk I downloaded from the FTP site didn't work (the installer just sits for a second and then quits), so I installed the CardWizard 3.10.01-C02-P03.01 for NT offered by the preinstalled "disk factory." When that config wouldn't talk to the 3C575 I deinstalled everything network-related, disabled the NT pcmcia driver, and rebooted with the card inserted, as suggested by a tech tip on 3Com's web site, but no dice. CardWiz always pops up the "unknown card, please install a driver in network control panel now" even though the driver is there. Attempts to run the 3Com diagnostics utility from the TaskBar icon result in the error "unable to stop driver." -rich