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Technology Stocks : Adaptec (ADPT) -- Ignore unavailable to you. Want to Upgrade?

To: Larry Brew who wrote (4096)	11/30/1998 1:26:00 PM
From: Jim Switz	Read Replies (1) \| Respond to of 5944

FYI, basic definitions of SCSI generations. Some slow-day filler material which may be of interest to some folks new to ADPT and/or SCSI. From an Adaptec tech-support page (http://www.adaptec.com/support/faqs/aha294x.html) here's the basic differences. Note that the proposed Ultra3 standard, due to ship next year, is expected to double the performance of Ultra2. Q: What is the difference between SCSI-1, SCSI-2, Fast, Wide, Ultra Wide, and Ultra2? A: The primary difference is in the command set used in the SCSI standard and the bandwidth, or maximum available speed of the devices. SCSI-1 5MB/Sec 8 bit SCSI bus SCSI-2 5MB/Sec 8 bit SCSI bus SCSI-2 Fast 10MB/Sec 8 bit SCSI bus SCSI-2 Fast Wide 20MB/Sec 16 bit SCSI bus SCSI Ultra 20MB/Sec 8 bit SCSI bus SCSI Ultra Wide 40MB/Sec 16 bit SCSI bus Ultra2 Narrow 40MB/Sec 8 bit SCSI bus Ultra2 Wide 80MB/sec 16 bit SCSI bus Ultra2 speeds are available only when a Ultra2 host adapter is connected to Low Voltage Differential (LVD) devices on the LVD/SE port. If a single-ended (SE) wide or narrow SCSI-2 device is connected to the LVD/SE port, the performance for all devices reverts to SCSI Ultra.