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===SCSI-2===
[[File:53CF94 SCSI-2 ASIC.gif|thumb|[[AMD]] 53CF94 SCSI-2 controller in [[plastic leaded chip carrier#Plastic leaded chip carrier|PLCC-84]] package
'''SCSI-2''' was introduced in 1994 and gave rise to the '''Fast SCSI''' and '''Wide SCSI''' variants. Fast SCSI doubled the maximum transfer rate to 10 MB/s while retaining the same 50-pin cables, while Wide SCSI doubled the bus width to 16 bits on top of that to reach a maximum transfer rate of 20 MB/s, using new 68-pin cables. However, these improvements came at the cost of reducing the maximum cable length to three meters. SCSI-2 also specified a 32-bit version of Wide SCSI, which used two 16-bit cables per bus. The 32-bit implementation was largely ignored because it was deemed expensive and unnecessary, and was officially retired in SCSI-3.
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