| 摘要 |
The system bus in a computer system includes a number of slots for individual expansion cards. Generally, input/output and memory operations to those expansion cards enable all the cards when one addressing range is used, but only enable one of the cards when another addressing range is used. According to the invention, any particular card can be disabled, or any combination of cards can be disabled, no matter which address range is used for the input/output or memory operation. This allows each card to be individually checked at start up to determine its I/O address and memory range without the possibility of another card responding, even if that other card is configured to respond to the same addresses.
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