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This item is from the PC Hardware FAQ, by Willie Lim and Ralph Valentino with numerous contributions by others. (v1.25).

2.41 What is the difference between EISA Standard and Enhanced modes?

Many EISA cards support both Standard (ISA) and Enhanced (EISA) modes. In Standard mode, the card will appear to be an ISA card to the OS; it will generate edge triggered interrupts and only accept ISA addressing (for bus mastering cards), for instance. An important thing to note is that the card may still do EISA specific things like 32-bit data bus mastering and EISA configuration setup as this functionality is hidden from the OS.

 

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