EtherDFS is an 'installable filesystem' TSR for DOS. It maps a drive from a remote computer (typically Linux-based) to a local drive letter, using raw ethernet frames to communicate.  This is truly an amazing piece of networking and only needs a packet driver and the EtherDFS client to map a drive letter to the server side.  NOTE - you'll need to setup the server side on a Linux box, but it's quite easy.