Adaptec 1520B User Guide - Page 12

I installed the host adapter and my SCSI disk drive, but my computer will not boot from the SCSI disk drive. If both SCSI and non-SCSI (e.g., IDE) disk drives are installed, then the non-SCSI disk drive is always the boot device. If your system has only SCSI disk drives: s Make sure the host adapter BIOS is enabled through the switch block and in SCSISelect. s Make sure the Hard Disk (or Drives) setting in your computer's setup program is set to None or No Drives Installed, as is required for SCSI hard disk drives. s Make sure the SCSI boot drive is set to SCSI ID 0. If you have a second SCSI disk drive, assign SCSI ID 1 to the drive. The system works erratically. It hangs or the host adapter sometimes cannot find the drives. Check cable length and integrity. If one or more Fast SCSI devices are installed, the total length of all cables (internal and external) connected to the host adapter should not exceed 3 meters (9.8 feet). If no Fast SCSI devices are connected, the total length of all cables should not exceed 6 meters (19.7 feet). When trying to install SCO UNIX, I get an F12 error message; or, SCO UNIX will not boot up after being installed. Run SCSISelect and disable Plug and Play Support, Plug and Play SCAM Support, and Extended BIOS Translation for DOS Drives > 1 GByte. Note: If a partition was created using the above settings enabled you may need to low level format the hard drive and reinstall SCO UNIX; make sure to disable the settings listed above. I have both a Soundblaster card with a SCSI controller embedded on it, and an AHA-1520B installed in the same computer. Am I going to experience any resource conflicts? The AHA-1520B and the SCSI controller on the Soundblaster card are typically both set, by default, to use I/O port address 340 and IRQ 11. In addition, the Soundblaster card may also use I/O port address 330 for its Midi port. To avoid resource conflicts, make sure to change the settings on one of the cards. When trying to run the format/verify SCSI disk utility in SCSISelect, I get an Unexpected SCSI Command Failure pop-up box with error information. The utility probably encountered a problem with the disk device or the media and therefore cannot run. You can determine from the Sense Key information (e.g., 06h Unit Attention) both the cause of the problem and its solution. Here are some of the more common Sense Key values and their meanings: s 02h - Not ready-The media is not ready to format. Be sure that media is inserted in the drive and that the media is spun up. s 03h - Medium error-The disk media may be defective. If it is a removable-media drive, try using a different disk media. If it is a fixed disk drive, the disk may be physically damaged. Verify and format the media with SCSISelect. s 04h - Hardware error-The disk drive may be defective. Consult the hardware documentation and contact the manufacturer. s 05h - Illegal request-The Adaptec formatting utility does not support a low-level format of this device; however, the device may already be low-level formatted by the manufacturer. (This error rarely occurs.) s 06h - Unit attention-The removable media may be write-protected. Disable write protection and run the utility again. I disabled the host adapter BIOS via the switch block, and now I can no longer run SCSISelect to configure the host adapter. Once the BIOS is disabled via the switch block, you can no longer access SCSISelect. To disable the BIOS and still have access to SCSISelect, complete the following: 1 Set the Host Adapter BIOS Address setting on the switch block to an available BIOS address (see Setting Host Adapter Switches on page 7). 2 Run the SCSISelect utility, disable the Host Adapter BIOS setting in Advanced Configuration Options (this disables the BIOS but still allows access to SCSISelect). See Starting the SCSISelect Utility on page 8. AHA-1520B Installation Guide Part Number: 511162-00, Rev. A Page 12 of 16 Print Spec Number: 495339-00 Current Date: 5/30/96 Last Modified: May 30, 1996 3:43 pm File Location: n:\mario\1520b_ig.nec\1520b_ig.frm ECN Date: 6/11/95 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA 12