Patent
1996-05-21
1998-09-08
Sheikh, Ayaz R.
395281, 395282, 395283, G06F 132
Patent
active
058059032
ABSTRACT:
An apparatus ensures that circuit cards of a computer system are properly oriented and fully inserted into their slots before allowing the computer system to power-up. Each card has two electrically connected key fingers on the card edge, while each slot has first and second contacts adapted to engage the two key fingers when the card is fully seated on the slot. One contact of the first slot is connected to a known voltage, while the second contact is connected to the first contact of the next slot. The second contact of the next slot is in turn connected to the first contact of the subsequent slot. Thus, upon a complete engagement of the cards onto the slots, all contacts are connected in a series arrangement. The final contact is connected to an insertion detector which turns on the computer system power supply only when the voltage of the last contact equals the known voltage, indicating that all circuit cards are fully seated on the slots. Additionally, each circuit card has a card edge with asymmetrical segments which form a mechanical key for ensuring proper orientation of the circuit card on the slot.
REFERENCES:
patent: 4800462 (1989-01-01), Zacher et al.
patent: 5528459 (1996-06-01), Ainsbury et al.
patent: 5589719 (1996-12-01), Fiset
Augat, Inc., Datasheet for 46-8 Series/Card Edge Connector (1992).
Compaq Computer Corporation
Etienne Ario
Sheikh Ayaz R.
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