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How is SCSI-2 different from SCSI-1?

April 26, 2017different SCSI-1 SCSI-2

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How is SCSI-2 different from SCSI-1?

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1. Several options were removed from SCSI-1: a. Single initiator option was removed. b. Non-arbitrating Systems option was removed. c. Non-extended sense data option was removed. d. Reservation queuing option was removed. e. The read-only device command set was replaced by the CD-ROM command set. f. The alternative 1 shielded connector was dropped. 2. There are several new low-level requirements in SCSI-2: a. Parity must be implemented. b. Initiators must provide TERMPWR — Targets may provide TERMPWR. c. The arbitration delay was extended to 2.4 us from 2.2 us. d. Message support is now required. 3. Many options significantly enhancing SCSI were added: a. Wide SCSI (up to 32 bits wide using a second cable) b. Fast SCSI (synchronous data transfers of up to 10 Mega-transfers per second — up to 40 MegaBytes per second when combined with wide SCSI) c. Command queuing (up to 256 commands per initiator on each logical unit) d. High-density connector alternatives were added for both shielde