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Understanding SCSI: History, Setup, and Comparison to IDE

This article explores the Small Computer System Interface (SCSI), detailing its historical development, from its origins as SASI in 1979 to the ANSI standardization in the early 1980s. We discuss the setup process, including SCSI host adapter installation, device addressing, and bus termination. The advantages of SCSI over IDE are analyzed, including performance, expandability, and compatibility within systems. We conclude with insights into the future of SCSI technology and its relevance in today’s computing landscape.

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Understanding SCSI: History, Setup, and Comparison to IDE

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Presentation Transcript

  1. SCSI Interface

  2. Introduction • Small Computer System Interface • Why this Article? • SCSI is System level interface • SCSI bus can hold up to 8 units

  3. History of SCSI • In 1979 , Shugart Associates System Interface(SASI) was created • In 1981 , Alan Shugart teamed up with NCR corporation to make SASI into ANSI standard • In 1982 , ANSI set up committee to work on standardizing SASI • In 1986 , First version of SCSI was published

  4. Setting Up SCSI • SCSI Host Adapter • SCSI Compatible Peripherals • SCSI Cabling • SCSI Termination

  5. LT 1086 Chip SCSI Termination Active Termination Passive Termination

  6. Installation Overview • Put a SCSI Host Adapter into a PCI Slot • Assign a SCSI ID to the peripherals. This is done with a jumper or DIP switch • Enable or Disable SCSI parity on the peripheral • Terminate both end of SCSI

  7. Bus Mastering • IDE transfer data using PIO Protocol • SCSI also uses DMA on ISA bus • The device which is connected on PCI bus takes control of system bus from CPU and transfers without using DMA controller • Bus Mastering is advanced form of DMA

  8. DMA • DMA itself is a bus master device • DMA controller sends a signal to CPU while can be doing something else • DMA is used to perform transfer without CPU intervention to or from peripherals

  9. DMA Limitations • The DMA slave is passive • DMA can only transfer blocks of contiguous memory content • DMA is generally slower. The original Intel 8237 DMA controller was extremely slow

  10. Comparisons of Drives • Configuration • Expandability and Number of Devices • S/W and O/S Compatibility • Noise and Heat • Media Access Speed • Interface Access Speed

  11. Performance • Drive Performance • Maximum Interface Data Transfer Speed • Single vs. Multiple Devices • Single vs. Multitasking • Device Mixing Issues

  12. Comparing Cost • Additional Hardware • Lower Volume • Niche Market • More Advance Technology

  13. Advantage • SCSI is better than IDE • IDE is cheaper than SCSI • SCSI is faster than IDE • Slow IDE devices also slow down other devices

  14. IDE or SCSI? SCSI is growing The Future of SCSI

  15. Conclusion

  16. Any Questions ???

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