Adaptec AHA-2742 Installation Guide - Page 4

SCSI Bus Termination-allows you to enable or disable SCSI termination on the host adapter. BIOS and SCSI Device Configuration-sets BIOS and SCSI device options. Refer to the following section for information on these options. BIOS and SCSI Device Configuration BIOS Configuration This option allows you to configure the host adapter BIOS. Greater Than 1 GByte Drive Support-provides a mechanism for using a hard disk with a capacity greater than 1 GByte. If this option is enabled, the following translation schemes are used: • Hard disks ≤ 1 GByte use a translation scheme of 64 heads, 32 sectors per track • Hard disks ≥ 1 GByte use a translation scheme of 255 heads, 63 sectors per track More Than Two Drives Support-allows BIOS to support more than two SCSI hard disks (supported by DOS 5.0 and above). If this option is enabled, up to eight hard disks can be attached to INT 13h. Removable Drive Support-allows you to select one of the following options for configuring removable drive support: • Disable removable drive support • Support removable drive as boot device only • Support all removable drives Note Support for removable drives means only that the BIOS allows for use of a removable drive as if it were a fixed disk drive; it does not mean that the disk media can be removed during operation. SCSI Device Configuration This option allows you to customize the configuration of the SCSI devices connected on the SCSI bus. Select values for each setting as instructed on the screen's menu. 7 Error if Device Not Found-selects whether the operator will be notified if the BIOS is unable to find the device during the boot procedure. BIOS Support Option-allows devices attached to the SCSI bus to be recognized by the host adapter BIOS and installed as devices on the system without the need for device driver software. Send Start Command-is used for devices that require a command to start up after power-on. Most devices do not require this. Initiate Synch Negotiation-allows the host adapter to attempt to use the faster synchronous protocol for data transfers on the SCSI bus. If deselected, the transfer will be done asynchronously, unless a SCSI device itself requests synchronous negotiation. Enable Disconnection-allows the device to go off-line while performing an operation. This allows the host adapter to perform other operations on the SCSI bus while the SCSI device is temporarily disconnected. Maximum Synch Transfer Rate-allows selection of the highest data transfer speed that the host adapter will attempt with that peripheral. The host adapter supports rates up to the Fast SCSI maximum of 10 MBytes/second. When configuration of the SCSI devices is complete, save the configuration and exit the EISA Configuration utility. Utilities Two SCSI utilities are available with your host adapter: Format Disk-accesses the Adaptec SCSI LowLevel Format utility. Most SCSI disk drives are pre-formatted, and do not need re-formatting. Host Adapter Diagnostics-runs a diagnostic on your host adapter by doing DMA transfers between the SCSI host adapter and system memory. You should run this utility without any device drivers or TSRs loaded. This test will run indefinitely until Esc is pressed. 8 7 Operating Environment Software DOS/Windows Under MS-DOS® 5.0 or higher, up to eight SCSI hard disk drives can be connected to the host adapter without additional software. (Older versions of DOS support up to two hard disk drives.) Additional software is required if you desire to do the following: • Support more than two hard disk drives under versions of DOS prior to MS-DOS 5.0 • Use devices other than hard disk drives such as SCSI tape, CD-ROM, scanners, etc. • Treat removable media devices as removable while your computer is running Refer to the documentation received with your I/O environment software package for instructions on loading your SCSI I/O operating environment for versions of DOS prior to MS-DOS 5.0. Novell NetWare®, OS/2®, and UNIX® Adaptec is working with major operating system suppliers to provide embedded support in their operating systems. Please contact Adaptec or your operating system vendor for information on the current schedule for I/O operating environment software support. 8 Troubleshooting System Will Not Boot From a SCSI Disk Drive If both SCSI and non-SCSI disk drives are installed, then the non-SCSI disk drive is always the boot device. If there is no non-SCSI disk drive: 1. Make sure your computer system's CMOS Setup is set to No Drives Installed, as is required for SCSI host adapters. 2. Try enabling the BIOS Support Option in the BIOS and SCSI Device Configuration option. See Section 6 , Configuring the Host Adapter. 9