IBM Token-Ring Network PC Adapter Hardware Maintenance And Service page 114

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Hold the top of the replacement adapter and press it
firmly into the expansion slot as shown below.
Note: If
Y0U
have an IBM Personal Computer, use
slot 4. This position allows the adapter to get
sufficient ventilation. If the fourth slot is occupied
by another adapter, check the documentation for
that adapter to see if it requires slot 4. If it does not
require slot 4, move the adapter another slot. If it
does require slot 4, insert the IBM Token-Ring
Network PC Adapter in the nearest available slot.
You can use any slot in the IBM PC XT or IBM
Personal Computer AT for the adapter.
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