SCSI - Short for small computer system interface - Short for little pc system interface, a parallel interface customary utilized by Apple Macintosh computers, PCs, and lots of UNIX systems for attaching peripheral devices to computers. Nearly all Apple Macintosh computers, excluding solely the earliest Macs and therefore the recent iMac, go together with a SCSI port for attaching devices like disk drives and printers.
SCSI interfaces offer for faster information transmission rates (up to eighty megabytes per second) than customary serial and parallel ports. additionally, you'll attach several devices to one SCSI port, so SCSI is actually an I/O bus instead of merely an interface.
Although SCSI is an ANSI customary, there are several variations of it, therefore 2 SCSI interfaces is also incompatible. as an example, SCSI supports many forms of connectors.
While SCSI has been the quality interface for Macintoshes, the iMac comes with IDE, a more cost-effective interface, within which the controller is integrated into the disk or CD-ROM drive. alternative interfaces supported by PCs embrace enhanced IDE and ESDI for mass storage devices, and Centronics for printers. You can, however, attach SCSI devices to a computer by inserting a SCSI board in one amongst the growth slots. several high-end new PCs go together with SCSI inbuilt. Note, however, that the dearth of one SCSI customary implies that some devices might not work with some SCSI boards.
The following types of SCSI are currently implemented:
- SCSI-1: Uses an 8-bit bus, and supports information rates of four MBps
- SCSI-2: Same as SCSI-1, however uses a 50-pin connector rather than a 25-pin connector, and supports multiple devices. this is often what the majority mean once they consult with plain SCSI.
- Wide SCSI: Uses a wider cable (168 cable lines to sixty eight pins) to support 16-bit transfers.
- quick SCSI: Uses an 8-bit bus, however doubles the clock rate to support information rates of ten MBps.
- quick Wide SCSI: Uses a 16-bit bus and supports information rates of twenty MBps.
- Ultra SCSI: Uses an 8-bit bus, and supports information rates of twenty MBps.
- SCSI-3: Uses a 16-bit bus and supports information rates of forty MBps. conjointly referred to as Ultra Wide SCSI.
- Ultra2 SCSI: Uses an 8-bit bus and supports information rates of forty MBps.
- Wide Ultra2 SCSI: Uses a 16-bit bus and supports information rates of eighty MBps.
SCSI interfaces offer for faster information transmission rates (up to eighty megabytes per second) than customary serial and parallel ports. additionally, you'll attach several devices to one SCSI port, so SCSI is actually an I/O bus instead of merely an interface.
Although SCSI is an ANSI customary, there are several variations of it, therefore 2 SCSI interfaces is also incompatible. as an example, SCSI supports many forms of connectors.
While SCSI has been the quality interface for Macintoshes, the iMac comes with IDE, a more cost-effective interface, within which the controller is integrated into the disk or CD-ROM drive. alternative interfaces supported by PCs embrace enhanced IDE and ESDI for mass storage devices, and Centronics for printers. You can, however, attach SCSI devices to a computer by inserting a SCSI board in one amongst the growth slots. several high-end new PCs go together with SCSI inbuilt. Note, however, that the dearth of one SCSI customary implies that some devices might not work with some SCSI boards.
The following types of SCSI are currently implemented:
- SCSI-1: Uses an 8-bit bus, and supports information rates of four MBps
- SCSI-2: Same as SCSI-1, however uses a 50-pin connector rather than a 25-pin connector, and supports multiple devices. this is often what the majority mean once they consult with plain SCSI.
- Wide SCSI: Uses a wider cable (168 cable lines to sixty eight pins) to support 16-bit transfers.
- quick SCSI: Uses an 8-bit bus, however doubles the clock rate to support information rates of ten MBps.
- quick Wide SCSI: Uses a 16-bit bus and supports information rates of twenty MBps.
- Ultra SCSI: Uses an 8-bit bus, and supports information rates of twenty MBps.
- SCSI-3: Uses a 16-bit bus and supports information rates of forty MBps. conjointly referred to as Ultra Wide SCSI.
- Ultra2 SCSI: Uses an 8-bit bus and supports information rates of forty MBps.
- Wide Ultra2 SCSI: Uses a 16-bit bus and supports information rates of eighty MBps.
