What is 'Encoder Bd Apple II' ????

[iepyeo@redash.qut.edu.au (Willie Yeo)]

	I have been passed on by one of my club members, a small little
card which stumped all of the Apple II members to what it does. I hope
that someone out there will be able to give a clue what this does.

	It is named "Encoder Bd. Apple II", Part# 820-0026-C, (c) 1979.
On the top right hand corner is a row of 25 pins sticking out. There is
a big 40 pin socket with no IC on it on the bottom right of the card.

	There is a manual switch labelled "CTRL-Reset" on the top left
corner. And another small empty 16 pin IC socket, on the bottem left.

	At the bottom middle row, there are 4 ICs, left to right,
555, 74LS00, 74LS00 and 74LS04. Not to mention a few resistors here and
there on the bottom rows, and a small capacitor on the bottom right.

	Any clues to what it does ? I know for sure it is an 'Encoder
Board Apple II' (Original Apple part).
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