DP 7400/7500 Series
On-Board SCSI Adapter

SCSI Adapter/Jumper Settings

The board is equipped with an integrated UItra2 Fast/Wide SCSI adapter. This adapter supports both LVD and single-ended SCSI devices. The adapter is enabled or disabled via hardware jumper JP4.

The SCSI adapter is a bus master device which gains control of the PCI bus to transfer data between the CPU memory and the SCSI devices. The I/O base address and interrupts are set by the PCI plug and play BIOS at boot time.

A SCSI configuration utility is available on boot-up of the board. Shortly after the SCSI BIOS information displays, the configuration program can be accessed by pressing Control C. The configuration utility will allow you to scan the SCSI bus, change configuration options, and view a list of SCSI devices connected to the board. For more in depth information on SCSI re-configuration, visit:

www.lsilogic.com/products/symio_ts.html

SCSI Termination

The DP7xxx board comes from the factory with the internal SCSI termination enabled. The internal SCSI connector is configured as one end of the SCSI chain. If applications necessitate external SCSI devices, JP1 will need to be disabled. The instructions in this section provide a detailed explanation of how to enable and disable SCSI termination.

To enable SCSI termination on the DP7xxx board, a shunt must be installed on JP1 (see Figure 3 which shows a factory-installed shunt on JP1). The internal SCSI connector is configured as one end of the SCSI chain.

The controller on the DP7xxx board supports either an UItra2 LVD SCSI or a Single-Ended Wide SCSI device. Figure 3 demonstrates termination for the Single-Ended Wide SCSI drive tray (example: a shunt installed on SCSI drive #2 enables termination). Therefore, if Single-Ended Wide SCSI drives are used, and additional hard drives are installed (up to 3 hard drives could be installed for a single group), the hard drive at the end of the Single-Ended Wide SCSI chain must have its termination load enabled.

If an LVD drive is used, the UItra2 LVD interface board on the drive tray supplies its own termination and all the UItra2 LVD drives must therefore remain unterminated.

To disable on-board SCSI termination on the DP7xxx board for the purpose of adding external SCSI devices, the shunt must be removed from JP1 as shown in Figure 4.

   
The device on the external end of the SCSI chain must supply a termination load to the cable (examples: SCSI Drives #2 and #4 in figure 4). SCSI devices not at the end of the cable must have their termination loads disconnected (consult the owner's manual for the external SCSI device). Also, an end bracket with the external SCSI cable connector (68-pin) should be installed into an expansion slot adjacent to the DP7xxx processor board end slot for easy exiting out the rear of the Density enclosure.


Drivers

Symbios 825A SCSI drivers can be downloaded by clicking on the link below.

Symbios SCSI Drivers (SCSI-SYM.EXE)

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