Cabling The Host Adapter; Connecting Standard 8-Bit Internal Scsi Devices - Adaptec AHA-2740W User Manual

Note:
EISA boards require firmer seating than typical
ISA expansion boards. Make sure the host adapter is
fully seated in its slot.

Cabling the Host Adapter

The AHA-2740W/2742W/2744W has three cable connectors for
connecting SCSI devices: two for connecting internal SCSI devices
and one for connecting external SCSI devices. The two internal SCSI
connectors consist of a 50-pin and 68-pin connector. The single exter-
nal connector consists of a 68-pin connector.
In addition, the AHA-2742W and AHA-2744W has a cable connector
that allows you to connect up to two floppy disk drives.
Only 8-bit internal SCSI devices can be connected to the 50-pin inter-
nal connector. The 68-pin internal and external connector normally
accepts 16-bit Wide SCSI devices; however, 8-bit SCSI devices can be
connected provided that they are equipped with 68-pin connectors.
The AHA-2740W/2742W/2744W can accommodate a single SCSI
bus with up to a total of 15 SCSI devices connected.
Note:
Only single-ended SCSI devices are supported by the
AHA-2740W/2742W host adapters, while only differential
SCSI devices are supported by the AHA-2744W host adapt-
ers. Differential SCSI devices may be damaged if connected
to the single-ended SCSI host adapter bus. Similarly, single-
ended SCSI devices may be damaged if connected to differ-
ential host adapters. Most SCSI devices currently produced
are single-ended SCSI devices. Consult your SCSI device
user documentation.

Connecting Standard 8-bit Internal SCSI Devices

Standard 8-bit internal SCSI devices use a 50-pin flat SCSI ribbon
cable with a 50-pin header internal connector. The cable has connec-
tors at each end and additional connectors attached in the middle.
One end of the cable is attached to the internal 50-pin SCSI connec-
tor on the host adapter, and the 8-bit internal SCSI devices are
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AHA-2740W/2742W/2744W User's Guide
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