Sending;¬ Adaptec 2940 PCI SCSI Adapter 
¬

¬SCSI Devices

This driver automatically detects the target adapter and 
automatically configures itself.  
PCI Bus

Supported Hardware: 

Adaptec AHA-2940 PCI SCSI Adapter
Adaptec AHA-2940W PCI Wide SCSI Adapter
Adaptec AHA-2940UW PCI Ultra Wide SCSI Adapter

The Adaptec 2940 SCSI Host Adapter Driver supports Command 
Queueing as well as Synchronous Data Transfer and Fast SCSI 
transfers, with Ultra fast SCSI transfer as a new feature.  

To use Synchronous Data Transfer and specify a data transfer rate, 
you must use both the Adaptec 2940 SCSI Adapter's SCSISelect 
program as well as the OPENSTEP for Mach Configure application. 

Note:  Consult the manual(s) for the SCSI devices connected to 
the Adaptec 2940 SCSI Adapter for information on these features. 

Installing and Configuring the Adaptec 2940 SCSI Adapter 

1.	Install the Adaptec 2940 adapter in your computer.  
2.	Use your computer's setup program to configure main system
 	BIOS to recognize the Adaptec 2940 adapter. 
3.	At boot time, use Control-A to invoke the Adaptec 2940 SCSI 
	Adapter's SCSISelect program. 
	Note:  Consult the manual(s) for the Adaptec 2940 SCSI 
	Adapter for information on configuring its BIOS. 
4.	Specify Synchronous Data Transfer and the data transfer rate. 
	In the SCSISelect program, invoke the SCSI Device 
	Configuration menu. Use the "Initiate Sync Negotiation" field 
	to enable or disable Synchronous Transfer on a per-target
	(SCSI ID) basis. Use the "Maximum Sync Transfer Rate" field 
	to specify the data rate.  If Synchronous Transfers are disabled, 
	the "Maximum Sync Transfer Rate" field is meaningless. 
	Note:  If the "Support for Ultra SCSI Speed" field is enabled 
	under the Advanced Configuration Options menu, then certain speeds up to 40MB/s can be selected. If the "Support for Ultra 
	SCSI Speed" field is disabled, then the maximum selectable 
	speed is 10MB/s (Fast SCSI). "Fast SCSI" Transfers are 
	enabled by selecting a value of 10 (10 Megabytes/second)
	for this field.  
	Note:  It is not recommended to select a value higher than 5 for
	a non-ultra device that is in an external enclosure and 
	connected to the 2940 via an external SCSI cable.  

Configuring the Adaptec 2940 SCSI Device Driver  

Note: See Configure's Help for general information on running the 
	Configure Application.
1. 	Click the SCSI icon at the top of Configure's Summary window.  
2. 	If you're planning to use the Adaptec 2940 PCI SCSI Adapter in
	 place of another adapter named in the list, select the other 
	adapter's name, and click Remove. 
3.	Click Add in the window.  
4. 	In  the Add SCSI Devices panel that opens, select the radio 
	button labeled "Show Drivers for Detected Devices."  Select 
	"Adaptec 2940 PCI SCSI Adapter"  from the list, and click Add. 
	Note:  If the Adaptec 2940 PCI SCSI Adapter device driver does
	 not show up in the list of detected devices, this indicates a 
	problem with the system setup. You need to run the system's 
	setup program at boot time to configure the system BIOS for 
	this adapter. 
5.	Using the buttons in the box labelled "SCSI Options", you may 
	enable either or both of the following two SCSI features: 
	Synchronous, and Command Queueing, which allows 
	commands to be queued on a compatible SCSI device. 
	Note: Disabling the "Synchronous" button disables 
	Synchronous Transfers for ALL targets (all SCSI IDs). If enabled,
	the values selected in the SCSISelect program are used to 
	determine whether or not Synchronous Transfers occur on a per-target basis. 
	Note: Enabling Command Queueing allows SCSI devices that 
	are capable to store commands for later processing, with an 
	overall improvement in SCSI performance. SCSI devices 
	without Command Queueing process their commands 
	individually. A SCSI chain with no Command Queueing 
	compatible devices sees no performance improvement.  
6.	Click Done, and then click Save. 
7.	Choose Quit from the Configure menu.

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See also

·	"Add a Device" in Configure's on-line help.

·	See NeXTanswer 1824 for general information on installing and 
	configuring device drivers. 

·	See NeXTanswer 1760 for an overview of this Adaptec 2940 
	device driver.