3c574_cs
However, if you are using the default installation of slackware for your laptop, the pcmcia bus should just load it for you. If you have recompiled the kernel, you are going to have to choose the driver for the card under Network Device Support -> PCMCIA Network Device Support
Just make sure you choose pcmcia bus support first (under General Setup -> PCMCIA/CardBus support), otherwise you will not be able to select the module for your card to compile.
GL