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.

EtherDFS is really easy to use and takes very little conventional memory.  Setting up a EtherDFS Server is also fairly easy.  More information can be found HERE at the official website.

EtherDFS Server is also supported by the RetroNAS project on Github which you can find HERE.