SCSI 1 — Terms & Terminology

SCSI-1

Asynchronous or synchronous transfers up to 5 megabytes per second, below defines how it is used in the different generations of the SCSI standards

SCSI-1

8 bit SCSI, Single-ended open collector drivers with Asynchronous transfer for all commands and data transfers. Bipolar technology for the drivers and receivers, bus DC loads a major consideration, passive termination.

SCSI-2

8 bit SCSI asynchronous commands with Synchronous data transfer rates up to 5 megabytes per second. Bipolar technology with Open collector or active negation single ended bus transceivers, passive or active termination, and Differential (Now called HVD – High Voltage differential) bus transceivers based on EIA 485 allowed in SCSI-2.

SCSI SPI (SCSI Parallel Interface)

8 bit SCSI asynchronous commands with Synchronous data transfer rates up to 5 megabytes per second. CMOS technology with Open Drain or active negation single ended bus transceivers, passive or active termination, and Differential (Now called HVD – High Voltage differential) bus transceivers based on EIA 485 allowed in SCSI SPI.

SCSI SPI-2 (SCSI Parallel Interface)

8 bit SCSI asynchronous commands with Synchronous data transfer rates up to 5 megabytes per second. CMOS technology with Open Drain or active negation single ended bus transceivers, active termination, LVD (Low Voltage Differential) and Differential (HVD – High Voltage differential) bus transceivers based on EIA 485 allowed in SCSI SPI-2.