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For this you will need the entire contents of BAGs 3 and 4 plus solder from BAG 5.

230x Diodes - Copper-orange glass cylinders with a black band marking one end. These are polarised and must face the same way as in the photographs.

Capacitors - Brown ceramic discs. Seven of these are used on each board.

Capacitors - Yellow ceramic discs. One of these is used on each board.

First fit the 7 ceramic capacitors:

Next the 7 diodes, the band FACES the CIRCLED HOLE, that is the wire leading from the banded end foes through the hole marked with a circle:

Then the 1n ceramic capacitor:

Finally a wire link:

Dismantle the three 25 way 'D' sockets, the easiest way is to cut through one of the rivets then seperate the two halves of the shell.



Open up the socket housing and remove the pins.

Fit two pins as shown and solder in place.



Make two of these for use with 2x IN-15Bs: Queens

Fit two pins as shown and solder in place.



Make sixteen of these for use with 16x IN-15Bs: Pawns

Fit two pins as shown and solder in place.



Make four of these for use with 4x IN-15As: Rooks

Fit two pins as shown and solder in place.



Make two of these for use with 2x IN-15As: Kings