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Low End Mac's Online Tech Journal
SCSI Termination Power
Apple has used the SCSI bus since introducing the Mac Plus in 1986. The SCSI bus must have termination power for clean data transmission.
Most Macs provide termination power for the SCSI bus, so most SCSI devices for the Mac don't need to provide it. However, the Mac Plus, Portable, 100-series PowerBooks, 500-series PowerBooks, and the PowerBook 1400 don't supply SCSI termination power (see Which Model Provide SCSI Termination Power?). Neither do Macs using IDE drives, such as the Quadra 630 (aka LC 630, Performa 63x) and many Power Macs (except for the 6100 and 7100-9600, all Power Macs use IDE drives).
This may apply to some Maclones as well. However, Umax assures me this is not the case with their Umax SuperMac C500 and C600. I've heard the same for the Motorola StarMax models with EDI drives.
All Apple and some third-party SCSI hard drives provide SCSI termination power. This is essential for these drives to work with the Plus, Portable, and most PowerBooks.
- This is an important issue, because if you are using an external drive that provides SCSI termination power on a Mac that doesn't provide it, your Mac will hang if you turn off the hard drive before turning off the computer. Also, the system may not boot from the external drive if it is not powered before turning on the Macintosh.
The source of the problem is a corrupted SCSI bus. Without termination power, noise on the bus can prevent startup and cause a lockup.
This is one reason Apple has always recommended you power up all SCSI devices before or at the same time as starting the computer, but never after the computer is running.
This is a good argument for buying only SCSI hard drives with active termination, allowing them to determine what level of termination (if any) is required in a given situation. (Of course, only the last device in a SCSI chain is normally terminated. If you have devices with active termination, one of them should be at the end of the chain with termination enabled. Other drives should have termination turned off.)
Other Resources
- Termination Explained (MOTJ)
- Macintosh Makes the Connection, an examination of Mac ports (MOTJ)
- SCSI Throughput (MOTJ)
- Which Model Provide SCSI Termination Power? (Apple TIL)
Recent Online Tech Journal Columns
- Optimized Software Builds Bring Out the Best in Your Mac, 06.30. Applications compiled for your Mac's CPU can load more quickly and run faster than ones compiled for universal use.
- Low End Mac's Safe Sleep FAQ, 06.15. What is Safe Sleep mode? Which Macs support it? How can you enable or disable it? And more.
- The Original Macintosh, 01.12. An in-depth look at the original Macintosh and how it shaped future Macs.
- The Innovative Lisa, 01.08. Apple's Lisa and how it paved the way for the Macintosh.
- More in the Online Tech Journal index.
Links for the Day
- Mac of the Day: eMac, Apr. 2002 - 50 lb. 17" white G4 eMac replaced the iMac for the education market.
- Group of the Day: Puma List is for anyone using Mac OS X 10.1.
- November 6 in LEM history: 98: The $30/month iMac - 00: Griffin NE Mic - 01: I'd rather use a Mac - The future of Apple - The best browser for recent Macs - 02: 15" PowerBook G4/1 GHz - iBook G3/800 - No questioning new 'Book value - Microsoft's near slap on the wrist - Using REALbasic Classic - 03: Keynote 1.1 - Dying FireWire cables - 06: FaxCenter for OS X - Low-end SATA cards - 07: Internet Explorer and the Classic Mac OS - Leopard with 384 MB
- Support Low End Mac
Recent Content on Low End Mac
- Dumping Macs for Google Apps, SSD in iMac, Late 2009 iMac Performance Problems, and More, Mac News Review, 11.06. /newsrev/09mnr/1106.html
- WiFi Paranoia, iMac-O-Lantern, Magic Mouse Does Click, Free Clipboard Managers, and More, Charles W. Moore, Miscellaneous Ramblings, 11.05. Also strange time stamps, problem with ColorIt on Intel Mac, and the story behind OS X 10.5.4 install discs.
- IDE Is Dead; Long Live SATA!, Dan Knight, Mac Musings, 11.04. SATA has displaced parallel ATA. While IDE hard drives haven't disappeared, the best deals are in SATA hard drives.
- QuickTime X in Snow Leopard Imports, Trims, and Publishes Video Quickly and Easily, Alan Zisman, Zis Mac, 11.04. The long, slow process of importing video into iMovie to edit it, then render it to another format, is history as QuickTime X does that much more quickly.
- More links in our archive.
Recent Deals
- Best Mac Pro Deals, 11.03. Used 2.66 GHz 4-core, $1,300; 3.0 8-core. $2,299; refurb 2.66 4-core Nehalem, $2,149; 2.93, $2,549; 2.26 8-core, $2,799; 2.93, $4,999.
- Best iPhone Deals, 11.03. New 8 GB iPhone 3G, $$99; refurb 16 GB 3GS, $149; new, $199; 32 GB, $299.
- Best 12" PowerBook G4 Deals, 11.03. Used 867 MHz SperDrive, $348; 1 GHz, $499; 1.33 Combo, $298; SD, $559; 1.5 Combo, $448; SuperDrive, $589.
- Best Power Mac G3 and PCI Video Card Deals, 11.02. Used beige 300 MHz, $25; G4/366, $49; blue & white 350, $80; 400, $90; 450, $105; PCI video cards from $15; shipping additional.
- Best Power Mac G4 and AGP Video Card Deals, 11.02. Used 400 MHz, $50; 733 MHz, $69; 933 MHz, $209; 1.25 GHz dual, $299.
- Best 15" MacBook Pro Deals, 11.02. Used 2.0 GHz, $800; 2.2, $900; 2.4, $1,000; refurb 2.53, $1,449; 2.66, $1,699; 2.8, $1,949; 3.06, $2,169; new 2.53, $1,579; 2.66, $1,799; more.
- Best Mac mini Deals, 10.30. Used 1.33 GHz G4 mini, $379; 1.42, $389; 1.5, $419; 1.83 GHz Core Duo, $350; Core 2, $439; new 2.26 GHz nVidia, $580; 2.53 GHz, $770; Server, $990.
- Best G4 iBook Deals, 10.30. Used 12" 1.07 GHz Combo, $225; 1.33 GHz, $298; 14" 1 GHz, $349; 1.33 GHz, $398; 1.42 GHz SuperDrive, $498.
- Best Classic Mac OS Deals, 10.30. System 6.0.8 floppies, $10; 7.1, $12; 7.5, $20; 7.5 CD, $4; 7.6 $13; 8.1, $11; 8.5, $20; 8.6, $90; 9.0, $20; 9.2.2, $30.
- More deals in our archive.
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