To use a boot floppy with VirtualBox, please choose in the menu of the virtual machine:
"Devices" - "Floppy Devices"
"Choose a virtual floppy disk file ..."
and point it to the *.img file, you like to use.
Novell NetWare and MS Client boot disks
Images from the “NetWare Boot Disk” (NwDsk) project by Erwin Veermans.
|fd32e.img||Novell Netware 32-bit Client (FreeDOS 1.0)
Support for Ethernet, IP/IPX, CDROM/VC, USB support, TinyHost, ...
|dr32e.img||Novell Netware 32-bit Client (OpenDOS)
Support for Ethernet, IP/IPX, pkt driver, TinyHost, CDROM/VC ...
|fd16.img||Novell Netware 16-bit Client (FreeDOS 1.0)
Support for IPX, pkt driver, USB/CDROM/VC/LFN/, LPD Print Server, Ping, ...
|fdmsrrc.img||Bart's Network Boot Disk
This is is the NwDsk variant, based on FreeDOS 1.0 and Microsoft Client 3.0, with USB / CDROM / NTFS / LPD, Remote Recover, updated drivers.