Adaptec - Adaptec SCSI Card N This restriction applies to all EISA and many motherboard configurations. Performance and feature sets vary throughout the aic7xxx product line. The following table provides a comparison of the different chips supported by the ahc driver. Note that wide and twin channel features, although always supported by a particular chip, may be disabled in a particular motherboard or card design. Multiplexed Twin Channel Device - One controller servicing two buses. Multi-function Twin Channel Device -[…]