CertiGuide to A+ (Core Hardware)

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CertiGuide to A+ (Core Hardware)
9 Chapter 0101: SCSI

VI Speeds and Feeds

VIII SE/HVD

VII Connectors

You saw before that connectors changed as SCSI improved in performance. A curious note the SCSI trade association web site does not recognize the DB-25 as the first SCSI connector. Yet, the real world may well expect you to know that the DB-25 is available as a SCSI connector. Specifically the DB-25 was seen in SCSI-1 devices.

DB-25

Officially, the DB-25 doesn’t exist for SCSI. AND, it EXISTS in the REAL WORLD.

[spacer] Don’t Smoke that Color Laser Printer

Be very cautious when working with a PC that has a SCSI-1 DB-25 connector. It has the same mechanical characteristics as a parallel port on the PC. Therefore it is extremely easy to take the PC end of a printer cable and plug it into a SCSI-1 connector. An UN-terminated SCSI connector could then send unwanted voltage to a printer, possibly ending the life of the printer.

For your visual edification, illustrations of the most popular SCSI connectors can be found in Figure 61, Figure 62, Figure 63 and Figure 64.

**Figure 61: DB-25M SCSI-1 Connector (Cable Viewpoint)**

**Figure 62: HD-50 SCSI 2 Connector**

**Figure 63: HD-68 Wide SCSI Connector**

**Figure 64: HD-80 Ultra2 SCSI Connector**

[spacer] Don’t Smoke that Drive

Be careful when using 80 pin SCA-2 connectors. This connector integrates power with signaling. Hot swapping power can be disastrous if done improperly.

VI Speeds and Feeds

VIII SE/HVD

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CertiGuide to A+ (Core Hardware) (http://www.CertiGuide.com/aplush/) on CertiGuide.com
Version 1.0 - Version Date: December 6, 2004

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