Black Box SCSI-2 LVD manual Scan BUS Screen

ULTRA2 LVD SCSI HOST ADAPTER

4.6.2THE SCAN BUS SCREEN

If you select “Scan Bus” at the Main Menu and press ENTER, the Utility scans the SCSI bus and displays a screen that lists, in the order of their SCSI IDs, the devices it has found, as well as the IDs without any devices assigned to them. While you’re at this screen, you can press <ENTER> to “Execute” a new scan (to rescan the bus). Keep in mind that (a) the best ID for a bootable hard disk is ID 0, and

(b)otherwise, you should only change a device’s ID if it conflicts with the ID of another device on the same bus (refer to the device’s documentation for how to do this).

4.6.3THE DEVICE SETUP MENU

If you select “Device Setup” at the Main Menu and press ENTER, the Utility displays a screen listing all of the bus’s possible SCSI IDs and a set of attributes that you can set for those IDs. Use the right-, left-, up-, and down-arrow keys to select any attribute, the plus and minus keys to change the setting of the selected attribute, or <F8> to reload the factory defaults for all attributes.

Asynchronous Transfer: Set this value to “Yes” or “No” (the factory-default setting is “No”) to respectively enable or disable asynchronous data transfer for the corresponding ID. The maximum data rate at which the Ultra2 LVD SCSI Host Adapter will transfer data asynchronously is 10 MB/second.

Maximum Synchronous Transfer Rate: Set this value to the maximum sync data rate at which the correpsonding devices can operate. (You can press “+” and “–” to cycle through the possible settings.) Your Adapter will run at 80 MB/second; this is the factory-default setting for all SCSI IDs. Whenever you connect a new SCSI device to the Adapter’s bus, refer to the device’s manual to determine its actual maximum data rate. If you still can’t figure it out, set this value to 10.0

(10 MB/second) until you can contact the device’s manufacturer.

DOS Space > 1 GB: This value has to do with how information stored on SCSI hard drives is accessed. (It has no meaning for non-hard-drive devices.) Under the “No” setting, the Adapter assumes that the corresponding drive has a maximum of 64 read/write heads and 32 sectors, a “head-mapping” configuration that conforms to the normal MS-DOS limit of 1024 cylinders (one gigabyte of capacity). Under the factory-default “Yes” setting, the Adapter assumes that the drive has a maximum of 255 heads and 63 sectors, an 8032-cylinder head-mapping configuration that corresponds to almost 8 GB of DOS-accessible capacity.

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