The N: device driver, as packaged here: (TODO: PUT N-HANDLER.ATR HERE)

Can have the NDEV.COM program copied as AUTORUN.SYS to a new disk. It will then load the N: driver automatically.

The utility programs NCD.COM and NPWD.COM can also be copied over, renamed if wanted, and used as is. It will ask for parameters interactively.

This handler will work as-is under DOS 2.0 and 2.5 with BASIC and other language cartridges, the driver loads at MEMLO, and MEM.SAV should be put on the disk to persist it as you move back and forth between DUP and the cartridge.

However, the FMS needs two POKE statements to raise the disk buffer size so that the N: handler can be loaded without DUP clobbering NDEV.

Making N: work with DUP

In BASIC, type the following:

POKE 1804,28
POKE 1805,124
OPEN #1,8,0,"D:DOS.SYS":CLOSE #1
X=USR(58487)

After the system reboots, you will be able to use the N: device in DUP.