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

[god23@heaven.org (Bart)]

In article <Fk9j4.10576$C4.142816@news1.teleport.com>, me2@nowhere.org says...
>
>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 board that is the size of a 
>64k chip and is marked DM74S153N.
Well I figured out WHERE this board goes, but I still have not a clue WHAT it 
is for:
the male to female 16 pin connectors are suposed to fit on the ribbon wire for 
the keyboard, and the IC looking dongle on the other ribbon wire connects tot 
he game port.  I hooked it up so and it still boots ok, but as I said, what it 
is for?  Have not a clue.
-Bart
ps oh and btw Pim. yep: an unenhanced //e: it also has a copywrite date of 
1982