Adaptec AHA-2742T User Manual - Page 68

Caution, Configuring the Host Adapter

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Configuring the Host Adapter The Fast SCSI synchronous data transfer rates are 10.0, 8.0, 6.67, and 5.7 MBytes/sec. If the host adapter is set not to negotiate for synchronous data transfer (i.e., Initiate Sync Negotiation is set to no), then the value selected here will be the maximum rate that the host adapter will accept. In most cases, the maximum value of 10.0 MBytes/sec can be used. If the drive is not a Fast SCSI drive and cannot support the fast data transfer rates, it can negotiate for a slower rate (this is standard SCSI protocol). However, if a drive cannot accept values greater than 5.0 MBytes/sec (the highest standard synchronous transfer rate), then the Fast data transfer rates should not be used for the device. Older SCSI-1 devices may not accept the Fast data transfer rates, which may result in erratic behavior or a hang condition. Include in BIOS Scan This option determines whether or not the host adapter BIOS supports devices attached to the SCSI bus without the need for device driver software. When set to yes, the host adapter BIOS controls the SCSI device. When set to no, the host adapter BIOS will not search the SCSI ID for devices to control; device driver software is needed to control the SCSI device. The default setting is yes. Caution If a removable media SCSI device is controlled by the host adapter BIOS, do not remove the media while the system is powered-on or data loss could occur! The host adapter BIOS does not support removability while the system is turned on. If removability is desired while the system is powered-on, the removable media device should be installed with device drivers and not the host adapter BIOS. Adaptec AHA-2740 Series User's Manual Stock Number: 510381-00 / Rev. C (Page 3-17) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93 3-17

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The Fast SCSI synchronous data transfer rates are 10.0, 8.0, 6.67,
and 5.7 MBytes/sec. If the host adapter is set not to negotiate for
synchronous data transfer (i.e., Initiate Sync Negotiation is set to
no
), then the value selected here will be the maximum rate that the
host adapter will accept.
In most cases, the maximum value of 10.0 MBytes/sec can be
used. If the drive is not a Fast SCSI drive and cannot support the
fast data transfer rates, it can negotiate for a slower rate (this is
standard SCSI protocol). However, if a drive cannot accept values
greater than 5.0 MBytes/sec (the highest standard synchronous
transfer rate), then the Fast data transfer rates should not be
used for the device. Older SCSI-1 devices may not accept the Fast
data transfer rates, which may result in erratic behavior or a
hang
condition
.
Include in BIOS Scan
This option determines whether or not the host adapter BIOS sup-
ports devices attached to the SCSI bus without the need for device
driver software.
When set to
yes
, the host adapter BIOS controls the SCSI device.
When set to
no,
the host adapter BIOS will not search the SCSI
ID for devices to control; device driver software is needed to con-
trol the SCSI device. The default setting is
yes
.
Caution
If a removable media SCSI device is controlled by the host
adapter BIOS, do not remove the media while the system is
powered-on or data loss could occur! The host adapter BIOS
does not support
removability
while the system is turned on. If
removability is desired while the system is powered-on, the
removable media device should be installed with device driv-
ers and not the host adapter BIOS.
Adaptec AHA-2740 Series User’s Manual
Stock Number:
510381-00
/
Rev. C
(Page 3-17)
Print Spec Number:
491709-00 Rev C
Current Date:
9/1/93
ECN Date:
9/14/93
Configuring the Host Adapter
3-17