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SCSI-1
Established
in 1986 by ANSI which specified 5MHz Bus Speed, 8 bits Bus Width at 5
MB/sec and 8 devices per Bus. (25 D-Sub or 50 position Centronics)
SCSI-2
By
1990 ANSI approved it's SCSI-2 which can use FAST SCSI at 20 MB/sec and
Wide SCSI at 16 bit Bus Width to support up to 16 devices per Bus (25
or 50 position Centronics)
SCSI-3
Using
Ultra Wide SCSI can increase Bus Speed up to 40 MB/sec and Ultra 2 SCSI
double speed to 80 MB/sec. (50 or 68 position high density D-Sub / 50
or 68 position .8mm VHDCI)
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