Adaptec 3940UW User's Guide download pdf (Page 26)

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AHA-3940U/3940UW/3940UWD User’s Guide

Stock Number: 511041-00, Rev. B Page: 2-6

Print Spec Number: 494569-00

Current Date: 2/14/97 ECN Date: 2/17/97

Connecting Internal SCSI Devices

Read the device documentation if you need to physically install a

SCSI device inside your computer before attaching the cables. To

connect internal SCSI devices to an AHA-3940U/3940UW/

3940UWD host adapter, you need the following:

■

A 50-pin internal SCSI ribbon cable for the AHA-3940U. (Or

two cables, if you are using both internal SCSI connectors.)

■

A 68-pin internal SCSI ribbon cable for the AHA-3940UW or

AHA-3940UWD. (Or two such cables, if you are using both

internal SCSI connectors.)

There must be more connectors in the middle of the cable if you are

attaching more than one internal device. Make sure your cable has

enough connectors. To connect three or more internal SCSI devices

to a SCSI bus, make a SCSI ribbon cable that has enough connectors

for all the SCSI devices.

You can connect both 8-bit and 16-bit SCSI devices to an

AHA-3940UW or AHA-3940UWD host adapter. To attach 8-bit inter-

nal devices to a wide SCSI bus, use a 68-pin-to-50-pin converter.

You can buy this internal 68-pin-to-50-pin converter from any

authorized Adaptec reseller. Call Adaptec for more information at

(800) 959-SCSI.

Do not use this converter at the end of the cable; the converter does

not provide termination for the high data byte. To terminate a SCSI

bus properly, you must put a 16-bit device at the end of the cable. If a

Plug this end into the

internal wide cable

Plug this end into an

8-bit internal device

Figure 2-5. 68-pin-to-50-pin Converter

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Adaptec 3940UW User's Guide Page 26