Installation guide

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AHA-2840A/2842A Installation Guide
Part Number: 510590-00, Rev B
Print Spec Number: 492663-00
Current Date: 5/9/96 ECN Date: 6/3/96
device. If the system has only SCSI disk drives, check
the following:
1 Make sure your computer's CMOS Setup is set to
No Drives Installed, as required for SCSI host
adapters.
2 Make sure the boot hard disk SCSI ID is 0. The
SCSI ID is normally set with jumpers or switches
on the drive.
3 If this does not solve the problem, back up all data
on the SCSI hard disk and perform a low-level
format with the SCSISelect Format Disk
option.
See the MS-DOS documentation for instructions
on partitioning the disk after formatting.
Conflicts With Other Option Cards or Devices
Your host adapter and other devices may not share
system resources such as IRQ channels, port
addresses, and BIOS addresses. If you experience
conflicts, change IRQ channels with the SCSISelect
utility or set the host adapter switches to a different
port address and/or BIOS address.
Switch Block Settings
The AHA-2840A/2842A switch block is located in
the upper left-hand corner of the board. This table
shows all the possible settings of the eight switches.
Default settings are marked with an asterisk (*).
sw1 sw2 sw3 sw4 I/O Address sw5 Floppy Controller
Off Off Off Off 1C00h* Off Enabled*
On Off Off Off 2C00h On Disabled
Off On Off Off 3C00h sw6 sw7 BIOS Address
On On Off Off 4C00h Off Off D8000h*
Off Off On Off 5C00h On Off C8000h
On Off On Off 6C00h Off On D0000h
Off On On Off 7C00h On On E0000h
On On On Off 8C00h sw8 Host Adapter BIOS
Off Off Off On 9C00h Off Enabled*
On Off Off On AC00h On Disabled
Off On Off On BC00h
Off = Open
On On Off On CC00h
Off Off On On DC00h
On Off On On EC00h
Off On On On FC00h
On On On On Reserved
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