Tandy 1200 HD User Manual page 133

SCREW
COVER
CAUTION
DO NOT DISCARD THE REAR OPENING COVER. IT
MUST BE REINSTALLED
IF
EVER THE CIRCUIT
CARD IS REMOVED FROM THE EXPANSION SLOT.
IF THIS PRECAUTION IS NOT OBSERVED, YOUR
SYSTEM UNIT MAY OVERHEAT.
2. Slide the option card straight down into the expansion slot
and fasten it to the rear of the chassis with the screw that
held the rear opening cover in place.
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