The North Star Advantage - the sequel to the Horizon

Not much I can tell you about the North Star Advantage at the moment.

I am looking for a copy of North Star DOS - it is asking me to "LOAD SYSTEM"

Specifications:

ERA:	1981
CPU:	Zilog Z80 @ 4MHz
RAM:	32k
DRIVES:	1 x Internal 5.25" 360k 1 x Internal 5MB Hard Disk
MONITOR:	Internal 12" Monochrome
AUDIO:	Internal Speaker
I/O:	6 x Internal Slots 1 x RS-232 Port 1 x Parallel Port
Keyboard	QWERTY Keyboard