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■
Extended BIOS Translation for DOS Drives
> 1 GByte
—This option determines whether extended
translation is available for SCSI hard disks with capaci-
ties greater than 1 GByte. Extended BIOS Translation
is used only with MS-DOS 5.0 or above. You do not
need to enable this option if you are using another
operating system such as NetWare or UNIX.
Caution:
If you decide to change the translation
scheme, back up your disk drives first! All data
is erased when you change from one translation
scheme to another.
The standard translation scheme for SCSI host
adapters provides a maximum accessible capacity of
1 GByte. To support disk drives larger than 1 GByte,
the AHA-1520B includes an extended translation
scheme. This scheme, under MS-DOS, supports 2
GBytes partitions on disk drives as large as 8 GBytes.
When you partition a disk under BIOS control larger
than 1 GByte, use the MS-DOS
fdisk
utility as you
normally would. (Because the cylinder size increases
to 8 MBytes under extended translation, the partition
size you choose must be a multiple of 8 MBytes. If
you request a size that is not a multiple of 8 MBytes,
fdisk
rounds up to the nearest whole multiple of 8
MBytes.)
Need Assistance?
Troubleshooting Checklist
Most problems that occur with your host adapter result
from errors in preparing and connecting devices on the
SCSI bus. If you have problems when using your host
adapter, check these items first.
■
Are all SCSI devices powered?
■
Are all SCSI bus cables and power cables properly
connected?
■
Is the host adapter firmly seated and secured in an
expansion slot?
■
Is pin-1 orientation maintained throughout the SCSI
bus? (See Step 6 on page 3.)
■
Do the host adapter and all devices on the SCSI bus
have unique SCSI IDs? (See Step 4 on page 3, and
Step 10 on page 4.)
■
Are all devices on the SCSI bus terminated properly?
(See Step 4 on page 3, and Step 10 on page 4.)
■
Is parity checking consistently enabled or disabled on
all devices (including the host adapter) on the SCSI
bus? (See Basic Host Adapter Settings on page 9.)
If you still have problems after checking the above items,
continue with the following sections.
Common Problems and Solutions
When the Adaptec BIOS header message appears, it hangs my system.
Make sure the SCSI hard drives at SCSI ID 0 and 1 are
properly terminated. Check for possible resource con-
flicts between the host adapter and other cards installed
in your computer; the cards may have conflicting BIOS
address, I/O port address, DMA channel, and IRQ set-
tings. Make sure Shadow RAM is not enabled in your
computer’s CMOS setup program.
