Tandy 1200 HD User Manual page 146

NOTE
CERTAIN CIRCUIT CARDS MAY BE ATTACHED TO
THE SYSTEM UNIT BY ONE OR MORE CABLES.
YOU SHOULD NOT DISCONNECT THESE CABLES
AT EITHER END. SIMPLY SLIDE THE CARDS UP
AND OUT OF THEIR SLOTS. THEN LAY THEM
ASIDE WITH CABLES STILL ATTACHED. DO NOT
STRAIN THE CABLES.
2. Insert the 8087 coprocessor into the coprocessor socket on
the main circuit board. Observe the following guidelines:
Note the notch or dot at one end of the coprocessor and
its socket. Install the coprocessor so that its notch or dot
is at the same end as the notch or dot on the socket.
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Be careful not to bend the pins of the coprocessor.
Make sure all pins are aligned in the pin sockets before
inserting the coprocessor.
NOTCH
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