PK87.8
On the underside of the board link the through hole on the track that
has just be cut to pin 11 of U 20, see Fig 2.

            ____________             Bottom side of board
            _________   \            at top end of U 5 (8530A)
                     \   o
 Connect -> =====\    o         /=
 this hole  ==O  \==============/
 to pin 11         ___________
 of U 20    ______/ _________ \___
            _______/ _______ \____ 
            ________/ ___   \_____                  nd put it
in the position marked C 5. Put the 220pF capacitor in the position marked
C 3 and change the crystal to the 4.9152MHz crystal. On the top side of the
board between U 5 and U 14 (8530A and 7910) a thin track passes under R 12,
cut this track, see Fig 3.

continued in file pk87.4