Adaptec 1742A User Manual
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The RN5, RN6 and RN7 terminators on the AHA-1740A/1742Aare 150 ohm terminators. The RN2, RN4, and RN5 terminatorson the AHA-1744 are 330 ohm terminators. If the terminatorsare removed and installed again in the AHA-1744, be sure to putthe 8-pin terminators in the 8-pin sockets and the 10-pin termina-tors in the 10-pin sockets.All SCSI peripherals have a way to add or remove termination.On some devices terminating resistors must be installed or re-moved. On others, only a switch need be toggled. Consult theuser manual for the particular SCSI device.SCSI ParityThe AHA-1740A/1742A/1744 always generates SCSI parity.SCSI parity checking can be enabled or disabled via the EISAConfiguration utility. If any attached SCSI device does not gener-ate SCSI parity, then parity checking for that device should bedisabled.SCSI IDAll SCSI devices have a parameter known as SCSI ID. The validvalues are:0, 1, 2, 3, 4, 5, 6, 7This parameter is changed via jumpers or switches on most SCSIperipherals. The SCSI ID of the AHA-1740A/1742A/1744 is 7(highest priority) and can be changed via the EISA Configurationutility provided with the EISA system. The SCSI ID of the hostadapter is almost never changed from 7.All attached SCSI devices must have a unique SCSI ID. If theAHA-1740A/1742A/1744 is set to standard mode, the boot SCSIdisk drive must be set to 0.adaptec AHA-1740A/1742A/17442-4 |
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