Checklist - Adaptec AHA-1740A Installation Manual

EISA-to-Fast SCSI Host Adapter
Installation
must be used for proper operation. Ensure that the
external device drive types all correspond with the Single-
Ended/Differential marking on the bracket of the AHA-
17 40/17 44 resi)ectively.
Note that a cable with the appropriate connector at each end is
all that is required to connect a SCSI alternate-2 D-shell with a
Centronics-type or vice versa. There is no electrical or signal dif-
ference although the connectors are different sizes.
The subsystem, cables, and SCSI terminators must be installed
in accordance with the directions provided with the external
SCSI subsystem. The addresses selected for external SCSI de-
vices must not overlap with the addresses of the host adapter
or any other SCSI devices attached internally.
Generally speaking, there can be no more than seven other
SCSI devices attached, each with its own unique address and
the total cable length must not exceed 20 feet for single-ended
and 80 feet for differential.
Checklist
Before applying power to your system, the following items
should be completed and checked:
1. The 50-pin SCSI ribbon cable is connected to the host
adapter with proper pin 1 orientation.
2. The host adapter is firmly seated in the host computer's
adapter slot.
3. The correct SCSI addresses are selected on all attached SCSI
devices. Address 0 is reserved for the boot hard disk and ad-
dress 1 is used for a second hard disk.
4. The correct operating modes are selected on all attached
SCSI devices.
5. Terminators are installed or removed on the drives and host
adapter as required.
6. External SCSI devices are properly installed and cabled.
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