This was the last in the venerable line of Apple ][ machines, and includes such Mac-like features as ADB mouse and keyboard ports, special Mac-like keyboard and support for 3.5" floppy drives as well as Apple ][ 5 1/4" drives. It's possible to use the Disk][ from the Apple ][ as long as you put the expansion card in slot 7 of the GS. It's also worth noting that to run GS/OS you need at least ROM 01 machines. Thumbnails as usual:

Once I'd transplanted some memory from my 'Woz' GS I could start playing with GS/OS, and the family resemblance is obvious. You can see where they got the GUI ideas from; even the dialogue boxes are the same.......

Spot any similiarities? :)