Adaptec 1742A User Manual
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Contents
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Chapter FourMultiple Host Adapter SupportThe AHA-1740A/1742A/1744 supports more than one hostadapter in the system. The maximum number of host adapterssupported depends on the operating mode of the host adapter.Standard ModeAn EISA system can support up to a maximum of four AHA-1740A/1742A/1744 adapters in standard mode; limited by the fouravailable DMA channels: 0, 5, 6 and 7. The host adapters must beset to unique Interrupt channels (IRQ), DMA channels, I/O portaddresses, and BIOS addresses.Enhanced ModeAn EISA system supports up to a maximum of twelveAHA-1740A/1742A/1744 adapters in enhanced mode; limited bythe number of available EISA bus master supporting slots. EachAHA-1740A/1742A/1744 installed in enhanced mode by defaultshares IRQ 11. This value can be changed with the MCS EISAConfiguration utility by selecting the Host Adapter InterfaceMode and pressing Cntrl + R key combination to view systemresources (see Figure 3-3). Each AHA-1740A/1742A/1744 can beset to a unique IRQ to maximize system performance. The IRQcannot be changed with the AMI EISA Configuration utility(cfg.exe) or the Phoenix EISA Configuration utility (ptlecu.exe).4-1 |
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