mode dictates the software manager revision which can support the board, but hasno effect on the SCSI or host bus hardware connections.Standard Mode allows software drivers written for the AHA-1540 or AHA-1640 fami-lies to run unaltered on the AHA-1740 family. There is no performance penalty forthis on the EISA bus. The AHA-1740A/1742A/1744 still performs 32-bit transfers atspeeds up to 33 MBytes/second.Enhanced Mode allows the board to take advantage of a number of features whichwere not available on earlier host adapters. These include:• Fast SCSI data transfer• 32-bit addressing capability• Ability to access all EISA board registers• Single fast mailbox handling• Tagged queuing (SCSI)• Fully configurable SCSI bus options for each SCSI target IDConfiguration Diskette and Installation Guide (ASW-C174)As with other EISA boards, the AHA-1740A/1742A/1744 is configured by the EISAConfiguration Utility (ECU) that came with your EISA computer. The ASW-C174diskette contains the configuration and overlay files required by the ECU for theAHA-1740A/1742A/1744. In addition, the ASW-C174 contains a utility for checkingthe version of microcode in your AHA-1740A/1742A/1744 and for low-level formattingof hard disks.NoteThe AHA-1740/1744 stores microcode in an E2PROM. You can download microcodeto it by using theadl.exe download utility included on the ASW-C174. The AHA-1740A/1742A stores microcode in an EPROM. The A version boards do not supportthe download feature.adaptec AHA-1740A/1742A/17441- 4
