Yup. I looked at it originally and got worried by the system requirements . I've written my own stack anyway now and it seems to be working okay. I did manage to get an extra kb of RAM by using a bit off the end of the NIC buffers. The RTL8019 is probably one of the worst documented chips ever. It's Yet-Another-ISA-NE2000-Clone and just says go look at the NE2K docs for the specs BUT we change this and this and this on so and so page.