What are the differences between SCSI-1 and SCSI-2?
• Answer: The initial implementation of SCSI (now called SCSI-1) was designed primarily for Narrow (8-bit), single-ended, synchronous or asynchronous disk drives and was very limited relative to today’s SCSI. It includes synchronous and asynchronous data transfers at speeds up to 5 Mbytes/sec. Only passive termination was defined. It did not include definitions of a device independent interface. The standard connectors are the familiar 50-pin, female, low-density (0.1 inch spacing), non-shielded connector (now termed the non-shielded Alternative 2, A-connector) for internal wiring and the equally familiar 50-pin, male, shielded “centronics” type connector for external wiring (now termed the shielded, Alternative 2, A-connector). This “centronics” type connector is frequently called the “SCSI-1 connector”. 5 Mbyte/sec SCSI is termed “Slow” SCSI. SCSI cable lengths may be up to 6 meters (20 ft) for Slow SCSI. Even before X3.131-1986 was officially accepted by ANSI, the SCSI committee wen
