|
|
SCSI ==>
Small Computer System Interface
<hardware, standard> (SCSI) /skuh'zee/, /sek'si/ The most
popular processor-independent standard, via a parallel bus,
for system-level interfacing between a computer and intelligent
devices including hard disks, floppy disks, CD-ROM,
printers, scanners, and many more.
SCSI can connect multiple devices to a single SCSI adaptor
(or "host adaptor") on the computer's bus. SCSI transfers bits
in parallel and can operate in either asynchronous or
synchronous modes. The synchronous transfer rate is up
to 5MB/s. There must be at least one target and one initiator
on the SCSI bus.
SCSI connections normally use "single ended" drivers as
opposed to differential drivers. Single ended SCSI can
suport up to six metres of cable. Differential ended SCSI
can support up to 25 metres of cable.
SCSI was developed by Shugart Associates, which later became
Seagate. SCSI was originally called SASI for "Shugart
Associates System Interface" before it became a standard.
Due to SCSI's inherent protocol flexibility, large support
infrastructure, continued speed increases and the acceptance
of SCSI Expanders in applications it is expected to hold its market.
The original standard is now called "SCSI-1" to distinguish it
from SCSI-2 and SCSI-3 which include specifications of
Wide SCSI (a 16-bit bus) and Fast SCSI (10 MB/s transfer).
SCSI-1 has been standardised as ANSI X3.131-1986 and
ISO/IEC 9316.
A problem with SCSI is the large number of different
connectors allowed. Nowadays the trend is toward a 68-pin
miniature D-type or "high density" connector (HD68) for
Wide SCSI and a 50-pin version of the same connector (HD50)
for 8-bit SCSI (Type 1-4, pin pitch 1.27 mm x 2.45 mm).
50-pin ribbon cable connectors are also popular for internal
wiring (Type 5, pin pitch 2.54 mm x 2.54 mm). Apple
Computer used a 25-pin connector on the Macintosh computer
but this connector causes problems with high-speed equipment.
Original SCSI implementations were highly incompatible with
each other.
ASPI is a standard Microsoft Windows interface to SCSI
devices.
Usenet newsgroup: comp.periphs.scsi.
news:comp.periphs.scsi.
SCSI Trade Association & FAQ http://www.scsita.org/.
["System" or "Systems"?]
(1999-03-30)
Try this search on OneLook / Google
Nearby terms:
SMALGOL « SMALL « Small-C « Small Computer System Interface » small-office/home-office » Small Outline DIMM » Smalltalk
This article was derived from the Free Online Dictionary of Computers and is available under ther terms of the GNU Free Documentation License.
Presto Print SuitePresto Print Suite ** Presto Print Suite **Includes:- Presto PrintMagic,Presto ImageFolio,Presto PageManager,Presto PhotoAlbum,Kais Power GOO SE,Presto ClipArt Compatible with Win95,98,Me,2000,XPCompatibility/Requirements/Disclosures:** Requirements *** Windows XP,2000,ME,98,95,3.1* CD-ROM drive More ...
Marvel The Fantastic Four ComicsMarvel The Fantastic Four Comics MARVEL Presents: the opportunity to revisit the first 10 comic book adventures of some of the world's favorite heroes in Snap! Fantastic Four on CD-ROM. Windows 98/ME/2000/XP and Mac More ...
Hard Drive Cooler with Dual Fans (Blue)Hard Drive Cooler with Dual Fans (Blue) ** Dual Fan Cooler for Hard Disk **This cool blue fan is designed to pull damaging heat awayfrom 3.5-inch hard drives. The twin fan design helps extendthe life of the hard drive and is easy to install!General Features:- Blue color- For 3.5-inch hard disk drives- Extend hard drive life and reliability- Longer life and lower noise- Twin fan high air flow- Easy installation- Mounts to the bottom of any 3.5-inch hard drive- 4-pin Molex pass-through power connectorRetail Package Includes:- Hard drive fan- Mounting screwsNotes:- Adds 0.75-inch to drive height Compatibility/Requirements/Disclosures:** Requirements *** 3.5-inch hard disk drive* Available 4-pin power connector More ...
10-Bay ATX Window Case w/450W PS &Lights (Silver)10-Bay ATX Window Case w/450W PS &Lights (Silver) ** 10-Bay Silver ATX Computer Case **Start building your dream PC with this ATX computer case! Itfeatures seven expansion slots, six external drive bays, and four internal drive bays for all of your expansion needs! There are two columns on either side of the drive bays that light up - add that to the LED fan and the power supply fan that glows a bright blue in the heart of the case and the sleek silver looks and you have one cool looking case!!General Features:- Silver case- Power switch- Reset switch- Power LED- Hard drive LED- Two (2) USB ports on front of case- Microphone and headphone jacks on front of case- Power supply supports Intel Pentium 4 and AMD Athlon XP- Bubble columns (bubbles stationary) on either side of the drive bays which glow blue when the system is on! (Lights powered by a pass-through 4-pin Molex connector.)- See-through side panel window with fan and power supplyfan that emits a bright blue light.Drive Bay Features:- Four (4) 5.25-inch external drive bays- Two (2) 3.5-inch external drive bays- Four (4) 3.5-inch internal drive baysExpansion Features:- Seven (7) punchout expansion slotsSupported Form Factors:- ATX- Baby AT- Mini ATX- Micro ATXCase Fan Supply Support:- One (1) 80mm case fan on side panel window (pre-installed)- One (1) 80mm case fan on back (not included)Power Supply Features:- 450-watt power- 115v-230v manual switch- 100-127V @50/60Hz- 200-240V @50/60Hz- +3.3V/26A- +5V/35A- +12V/15A- -5V/0.5A- -12V/0.8A- +5Vsb/2.0ACase Dimensions:- 16.5 x 8 x 19.5-inches (H x W x D)Package Includes:- 10-Bay ATX computer case- 450-watt power supply- Power cord- Screw pack Compatibility/Requirements/Disclosures: ** Requirements *** Supported motherboard* Rest of system* Available power outlet More ...
Crayola Vehicle VoyagesCrayola Vehicle Voyages A Magic 3D Coloring Book featuring Vehicle Voyages! Preschoolers can create beautiful and life-like, three-dimensional pictures with a simple click of a mouse. Kids can change their masterpieces and print them out to share. The possibilities are endless! Ages 3-7. Windows 95/98/ME/2000/XP More ...
World Encyclopedia of Organized CrimeWorld Encyclopedia of Organized Crime With this title, you'll survey the history of organized crime and delve into underworld populated by mobsters and crime families. Gain insight to the history of organized crime through profiles on mobsters, crime families, syndicates, cartels, and law enforcers. Windows 95/98/ME/NT/2000/XP and Mac More ...
|
