A curious small circuit baord from a "]["?

[me2@nowhere.org (Bart)]

I picked up some Apples at Goodwill this weekend.  Today I found this inside
a //e (well the lid says //e, the RAM is in the right place for a //e, but it 
boots to "Apple ][" : It is a circuit board about 3.5 by 1 inch in size. It 
has 1 ribbon wire going to a IC pin set (male, 16 pins), a female on 1 side, 
male on other ribbon wire sockets for 28 pins and is marked "QUARK" on one 
side and "ALF" on the other.  It has 1 IC  on the baord that is the size of a 
64k chip and is marked DM74S153N.
Any clue?  It was just flopping around inside the case. Also any clue about 
why this puppy says "][" and looks like an "e"?

-Bart