| 摘要 |
A lockout apparatus for a number of expansion slots in a printed circuit board includes a lockout mechanism for the expansion slots. Each lockout mechanism includes a lockout member movable between a first position in which its respective expansion slot is blocked, and a second position in which its respective expansion slot is open. Only a single expansion slot is available for use at any one time. In another embodiment, add-on card installed into expansion slots may be retained in the expansion slot when the next expansion slot is filled.
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