SCSI Bus Trend

The original SCSI bus was released in 1984. Over these 20 years SCSI was up-graded a number of times raising it's throughput from SCSI-1 @ 5MB/s to 160MB/s for SCSI-5.

Any way I was updating web pages today based on when they were lasted reviewed. About half a dozen SCSI bus pages showed up with dates of 12/12/06. So I decided to take a look and see if those pages required an up-date ~ remember standards work stopped on a number of older SCSI standards [so the facts aren't changing].

I took a look at the SCSI page hits year to date, by month, and I noticed that the pages were only getting a few thousand hits combined. So 12 related SCSI bus topic pages only received 12,000 page views this year. That is real low for a major computer interface.

However; Serial SCSI [Serial Attached SCSI, or SAS] was released in 2003 which moved from a parallel interface to a serial interface ~ identical to SATA. The Serial SCSI interface jump the through put speed to 3Gbps, using a smaller cable.

So I realize the Parallel SCSI is in decline, but it seems that the trend is showing a massive decline, as shown in the chart.

Of the two main Hard Disk Driver interfaces [HDD], SCSI seems to be taking a harder hit then the IDE interface [ATA Bus] ~ which is also obsolete. The SCSI bus was also more expensive to implement than IDE, and SCSI tended to be integrated by high-end users so it stands to reason. Work stops on the SCSI standard and at the same time starts up on a new faster Serial SCSI ~ so you have no up-grade path. You have to move to the new Serial version of the bus.

IDE shows a hugh decline too, but not as massive

MIL-PRF-24758

There's not much there yet, but I added a page to cover MIL-PRF-24758. It's a military standard that specifies ship-board flexible weatherproof conduit. The page is listed under MIL-PRF-24758.

Electronic Capacitor Dictionary

I added several new pages to the Capacitor Dictionary, and a few new graphics.

The capacitor section increased from 4 pages to 11 pages. The capacitor terms can be found off the main Glossary listing.


Capacitor Terms 'A',
Capacitor Terms 'B' & 'C',
Capacitor Terms 'D',
Capacitor Terms 'E',
Capacitor Terms 'F' & 'G'
Capacitor Terms 'I' & 'L',
Capacitor Terms 'M' & 'N' & 'P',
Capacitor Terms 'Q' & 'R',
Capacitor Terms 'S',
Capacitor Terms 'T',
Capacitor Terms 'V' & 'W' & 'X' & 'Y' & 'Z',

Note; this listing was updated on 1/29/2010 as Indexed URLs by Google.
As these links were no longer being counted as external links.

Test Equipment

I took the Frequency Counter listing off the main Test Equipment Manufacturers page.
The new page is located on the Frequency Counter Manufacturers page.

DIMM Form Factors

This page provides the physical sizes of DIMM cards. The Memory Module Physical Sizes page really just accounts for DDR II or DDR III memory modules.

Older DIMM formats and SIMM formats are listed under the main Memory Module pinout page. SIMM cards are obsolete.

The top right of the Memory Module Form Factor page also provides links to all the other DIMM related pages;

• Interfacebus.com Home Page


• Memory Module Types


• Memory Module Pinouts


• Memory Module Definitions


• Memory Module Manufacturers


• VLP-DIMM Manufacturers


• DDR DIMM II Description


• DDR DIMM III Description


• FB-DIMM Description


• GDDR-DIMM Description


• DIMM Socket Manufacturers