Digital Equipment 300 Series AXP Reference Manual page 75

Removing and Installing a TURBOchannel Option (For Models 300/300X/300LX Systems)
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Insert the TURBOchannel option connector into the open
slot at the back of the system unit.
Firmly press the module onto the TURBOchannel
connector. This may require some extra effort, as
TURBOchannel options fit tightly.
Insert the two or four screws (that come with the option)
through the holes on the TURBOchannel module and into
the posts on the system module. Screw the module down
to secure the option to the system module.
Reinsert the screws (from step 2) to the back of the
system unit to hold the TURBOchannel option in place.
Connect external cables to the TURBOchannel option
at the back of the system unit. Refer to the option
documentation for proper cabling procedures.
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