American Megatrends Atlas PCI EISA User Manual page 56

Step 11 Install Adapter Cards,
PCI Local Bus Expansion Slots
The PCI Local Bus expansion slot sockets are distinctly different than the standard ISA expansion slot
sockets. These slots obviously accept a different kind of adapter card than the standard ISA adapter cards.
The slots are much more compact and smaller. PCI Slots D, E, and F are all master slots.
EISA Adapter Cards
EISA adapter cards have different fingers on the edge connecters than ISA adapter cards. The EISA
expansion slots have two rows of contacts, one below the other. An ISA (AT-compatible) Adapter Card can
be inserted in the EISA connector only far enough to make contact with the upper row of contacts. The longer
fingers on EISA adapter cards allow contact with the second row of contacts:
When installing EISA adapter cards, make sure that they snap in twice and are fully seated in the EISA
expansion slot. If the card makes contact only with the upper row of contacts, it cannot function properly.
Atlas PCI Pentium EISA Motherboard User's Guide
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