The Display/Disk Unit was two 5.25” floppy drives (308K storage each) and a 12” green monochrome CRT all in one.  This snazzy little unit opened up the world of disk based software which was required to do any serious computing with the Sorcerer.  These units were relatively expensive ($2,995 in 1980) and probably didn’t sell very well.  Working units are extremely hard to come by.