User guide

The BIOS base address is selected from a range of choices on the
manufacturer-supplied configuration utility. Common addresses for the AIC-7770
controller are: 0xCC00, 0xD400, 0xD800, and 0xDC00. The controller with the
lowest BIOS base address will become the boot or primary controller.
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Solaris 7 (Intel Platform Edition) Device Configuration Guide October 1998