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What (who) is SCSI adaptors - definition
SCSI target; SCSI initiator
Fast SCSI
![PLCC-84]] package.](https://commons.wikimedia.org/wiki/Special:FilePath/53CF94 SCSI-2 ASIC.gif?width=200 "PLCC-84]] package.")
![PLCC-84]] package](https://commons.wikimedia.org/wiki/Special:FilePath/Ncr 53c94 scsi asic.jpeg?width=200 "PLCC-84]] package")
ORIGINAL SCSI COMPUTER STORAGE BUS
SCSI1; SCSI-1; SCSI-2; SCSI2; SCSI-3; SCSI3; Fast SCSI; Wide SCSI; Ultra SCSI; Narrow SCSI; LVD SCSI; Ultra-160; Ultra SCSI-2; Ultra SCSI-3; Ultra-320; Ultra-640; Fast-320; Differential SCSI; Ultra-3; Ultra-2; SCSI Parallel Interface; Ultra2 SCSI; SCSI terminating resistor; Scsi terminating resistor; Quick arbitration and selection
SCSI-2
ORIGINAL SCSI COMPUTER STORAGE BUS
SCSI1; SCSI-1; SCSI-2; SCSI2; SCSI-3; SCSI3; Fast SCSI; Wide SCSI; Ultra SCSI; Narrow SCSI; LVD SCSI; Ultra-160; Ultra SCSI-2; Ultra SCSI-3; Ultra-320; Ultra-640; Fast-320; Differential SCSI; Ultra-3; Ultra-2; SCSI Parallel Interface; Ultra2 SCSI; SCSI terminating resistor; Scsi terminating resistor; Quick arbitration and selection
<hardware> A version of the SCSI command
specification.
SCSI-2 shares the original SCSI's asynchronous and
synchronous modes and adds a "Fast SCSI" mode ( < 10MB/s )
and "Wide SCSI" (16 bit, < 20MB/s or rarely 32 bit).
Another major enhancement was the definition of command sets
for different device classes. SCSI-1 was rather minimalistic
in this respect which led to various incompatibilities
especially for devices other than hard-disks. SCSI-2
addresses that problem. allowing scanners, {hard disk
drives}, CD-ROM drives, tapes and many other devices to be
connected.
Normal SCSI-2 equipment (not wide or differential) can be
connected to a SCSI-1 bus and vice versa.
(1995-04-19)
Wide SCSI
ORIGINAL SCSI COMPUTER STORAGE BUS
SCSI1; SCSI-1; SCSI-2; SCSI2; SCSI-3; SCSI3; Fast SCSI; Wide SCSI; Ultra SCSI; Narrow SCSI; LVD SCSI; Ultra-160; Ultra SCSI-2; Ultra SCSI-3; Ultra-320; Ultra-640; Fast-320; Differential SCSI; Ultra-3; Ultra-2; SCSI Parallel Interface; Ultra2 SCSI; SCSI terminating resistor; Scsi terminating resistor; Quick arbitration and selection
<hardware, standard> A variant on the SCSI-2 interface. It
uses a 16-bit bus - double the width of the original SCSI-1
- and therefore cannot be connected to a SCSI-1 bus. It
supports transfer rates up to 20 MB/s, like Fast SCSI.
There is also a SCSI-2 definition of Wide-SCSI with a 32 bit
data bus. This allows up to 40 megabytes per second but is
very rarely used because it requires a large number of wires
(118 wires on two connectors). Thus Wide SCSI usually means
16 bit-wide SCSI.
(1995-04-21)
Wikipedia
SCSI initiator and target
In computer data storage, a SCSI initiator is the endpoint that initiates a SCSI session, that is, sends a SCSI command. The initiator usually does not provide any Logical Unit Numbers (LUNs).
On the other hand, a SCSI target is the endpoint that does not initiate sessions, but instead waits for initiators' commands and provides required input/output data transfers. The target usually provides to the initiators one or more LUNs, because otherwise no read or write command would be possible.
