Can I Use a PC Card in an ExpressCard Slot?
The PC Card and ExpressCard interfaces are not compatible. What’s more, some new notebooks come with an ExpressCard slot in lieu of a PC Card slot. The incompatibility between PC Card and ExpressCard technologies has been particularly noticeable to mobile professionals who bought new ExpressCard-only notebooks but couldn’t find compatible cellular wireless modems to use with them. If you’re in that situation, you may have some options. For instance, some cellular wireless modems are available as USB devices, and every current notebook has at least one USB port. I’ve found a few commercially available options that let you use PC Card cellular modems on computers that lack a PC Card slot. In essence, these devices are external PC Card slots that attach to your notebook’s USB port. The USB Adapter for 32-bit CardBus Wireless Modem Cards ($180) is designed to let you use a supported PC Card cellular wireless modem via a computer’s USB port. The PC Cards supported are in the CardBus format,
