July 2003
Beginner to intermediate
874 pages
38h 13m
English
Content preview from PC Hardware in a Nutshell, 3rd Edition
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
Wide single-ended SCSI cables, connectors, and signals
Wide (16-bit) SCSI transfer modes use wide (68-pin) cables. Officially, a wide cable is called a SCSI P cable, but it may also be called a SCSI-2 cable or a 68-pin SCSI cable. A P cable may use any of several connectors, most commonly high-density 68-pin internal, high-density 68-pin external, and VHDCI 68-pin external. Wide SCSI uses 68 signals, each carried on one of the 68 wires in the SCSI P cable, with the 68 wires organized into 34 pairs. For SE SCSI, each pair includes a signal wire and a signal return (ground) wire. Figure 13-6 shows a SCSI P cable with an internal 68-pin high-density connector. Note the twisted pairs in the cable segment at top.
Figure 13-6. SCSI P cable with 68-pin high-density connector
Tip
Early wide SCSI implementations used an awkward combination of two cables: a standard 50-pin A cable and a special 68-pin B cable. The B cable was never popular, and the combination A+B cabling was quickly replaced by the single 68-pin P cable.
Table 13-11 lists the pinouts for SCSI P cables and connectors. A “#” following a signal name indicates that signal is active-low. In a P cable, (reserved) lines are left open in SCSI devices and terminators. Although conductor numbers do not map directly to pin numbers, all P cable connectors use the same pinouts.
Tip
A 32-bit SCSI Q cable was defined, but that cable was never ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.