What's in the BIOS?

In the Bios you would see these settings. They may look different depending on which SCSI card you have:

First Screen

Configure/view Host Adapter Settings
SCSI Disk Utilities

Pressing Enter on Configure/view Host Adapter Settings will give you these options:

1. Changing ID # of your SCSI card
2. Disable SCSI Parity Checking (best to leave this enabled)
3. Disable SCSI card termination (leave this to automatic if that is an option)
4. Boot Device Options (Allows you to set the ID # of your boot drive)
5. SCSI Device Configuration (allows you to change sync transfer rate of each ID, and change which ID's to scan for on bootup)

The option on the main screen is the SCSI Disk Utilities. This will verify your Disk media and can low-level format your drive. Consult your drive manufacturer on low-level formatting. Most often, it is NOT required on SCSI controllers.

External Terminators (Active or Passive)

A Passive Terminator is a group of resistors that are on the physical end of a SCSI-bus which dampen out reflected signals.

Termination is provided by a 220 Ohm resistor which will go to +5V (TERMPWR which voltage varies) and a 330 ohm resistor which will go to ground.

Active terminators are for the exact same purpose as the passive type, but these are more reliable and suggested to be used instead of passive. The +5V of TERMPWR will vary, so active terminators use a voltage regulator from each signal to a 2.8V regulated Voltage source.

The next page will show an example of an external terminator.

Next page: SCSI IDs

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