Adaptec 2100S Quick Start Guide - Page 17

controller that has the lowest BIOS ROM address (typically, the lowest numbered PCI slot) will become the booting controller. 5 Connect any external cables to the controller. Determining the Booting Controller Adaptec SCSI RAID controllers are shipped with an Adaptec I2O BIOS ROM enabled for PCI assignment. This ROM BIOS intercepts and processes INT13 BIOS calls with an embedded DOS driver. The Adaptec I2O BIOS ROM can be disabled or the address changed automatically by the system's Plug-and-Play BIOS. In systems with multiple Adaptec controllers, the first Adaptec I2O controller found during boot loads its BIOS and installs all of the Adaptec hardware on the system. Any additional Adaptec I2O controllers that are found automatically detect the presence of the first controller and disable their BIOS code. The disk controller that has the lowest BIOS ROM address (typically, the lowest PCI slot number) will become the booting controller. Ensure that the Adaptec ROM occupies the lowest address if you want the Adaptec controller to be the booting controller in a system with controllers from multiple manufacturers. Some system BIOS manufacturers select the smallest add-in BIOS as the first candidate, therefore slot selection has no effect on which adapter BIOS loads first. In this case, you need to disable the BIOS on 16