SCSI-1
The actual original SCSI was developed as early as 1979 by Shugart under the name Shugart Associates Systems Interface (SASI). In 1986 SCSI-1 was standardized by ANSI as X3.131-1986.
The goal of SCSI activities was directed at improving performance, increasing reliability, and providing additional functionality for interfaces. One of the most important goals was to formalize and standardize SCSI commands after proprietary solutions had already been implemented. Therefore, a working paper defined the Common Command Set( CCS) for the Small ComputerSystem Interface (SCSI).
In SCSI-1, all relevant bus characteristics are defined; such as the bus width, the length of the SCSI cable, the signaling, the command structure and the transfer modes. SCSI-1 works with an 8 bit wide bus and a maximum data transfer rate of 5 MB/s. Only asymmetrical transfer with passive bus termination was supported. The cable length was 6 m.