1.1Standard Features
(1)Compactness
Since the SCSI controller circuit is embedded in the standard
(2)SCSI/CCS standard
The IDD provides not only SCSI basic functions but also the following features:
∙Arbitration
∙Disconnection/reselection
∙Data bus parity
∙Command set which meets the logical specification of the SCSI CCS (Common Command Set for Direct Access Device) requirements (Rev. 4.B)
The SCSI commands can manipulate data through logical block addressing regardless of the physical characteristics of the disk drive. This allows software to accommodate future expansion of system functions.
(3)
The IDD has
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For the ultra SCSI model, number of connectable SCSI devices on the same SCSI bus is varied as follows.
∙Up to 4 SCSI devices having capacitance of 25 pF: Cable length of up to 3.0 m.
∙5 to 8 SCSI devices having capacitance of 25 pF: Cable length of up to 1.5 m
(4)High speed data transfer
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Such a high data transfer rate on the SCSI bus can be useful with the large capacity buffer in the IDD.
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