What is SASI (Shugart Associates System Interface)? Easy-to-understand explanation of basic concepts of data transfer
SASI (Shugart Associates System Interface) is a technology related to data transfer between computer systems and devices. It was developed by Shugart Associates in the late 1970s as an interface standard for connecting hard disk drives to computer systems. SASI later evolved into SCSI (Small Computer System Interface), which became the industry standard for data transfer.
At its core, SASI is a protocol that defines the communication between a computer system and a storage device, such as a hard disk drive. This interface allows the computer to send commands and receive data from the storage device, enabling the transfer of information between the two.
The basic concepts of data transfer in SASI involve the use of commands and data phases. When a computer wants to retrieve data from a storage device, it sends a command phase to instruct the device, specifying the action to be taken. This could be reading data from a specific location on the disk, for example. The device then responds with a status phase, indicating whether the command was successfully executed.
Once the command phase is complete, the data phase begins. This is where the actual transfer of data occurs between the computer and the storage device. The device sends the requested data to the computer, which can then process and use it as needed.
One of the key advantages of SASI was its ability to connect multiple peripherals to a single computer system. This allowed for the expansion of storage capacity and the connection of other devices, such as printers or scanners, through a single interface.
As technology advanced, SASI evolved into SCSI, incorporating improvements such as faster data transfer rates and improved device compatibility. SCSI, in turn, became widely adopted and still serves as the foundation for many storage interfaces today.
In conclusion, SASI is a technology that played a significant role in enabling data transfer between computer systems and storage devices. Its evolution to SCSI paved the way for advancements in data transfer capabilities, contributing to the growth and development of computer systems over the years.
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