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Comprehensive Overview of SCSI and IDE Interfaces for Multimedia Devices

This chapter provides an in-depth exploration of SCSI (Small Computer System Interface) and IDE (Integrated Drive Electronics) hardware peripherals. It discusses their capabilities, including the connection of multiple devices, data transfer rates, and device management within multimedia applications. The chapter covers SCSI’s architecture, which supports daisy-chaining up to 32 devices, and contrasts it with IDE, which is limited to internal connections. It emphasizes the importance of memory and storage for multimedia applications and also reviews various input/output devices utilized in multimedia systems.

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Comprehensive Overview of SCSI and IDE Interfaces for Multimedia Devices

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  1. COM 205Multimedia Applications St. Joseph’s College Fall 2003

  2. Chapter 4B Hardware Peripherals

  3. Connections • SCSI - ( “scuzzy”) Small Computer System Interface • Let’s you add disk drives, scanners,etc. • IDE - Integrated Drive Electronics • Connects hard drives, CD-ROMs only internally • MCI - Media Control Interface • Provided by Window to enable software to talk to multimedia devices

  4. Computer-System Architecture

  5. SCSI • Can connect up to 8 devices in a “daisy chain” (ID ( 0-7)) • ID0 = hard drive, ID7= computer • Must avoid ID conflicts • Ultra SCSI allows up to 32 devices • Built into Mac, installed in PC • Some Macs have 2 SCSI buses • In PC mounted as another drive • Floppy = A: hard drive = C: • CD-Rom= D: SCSI = E:, F: G: H:

  6. SCSI ( continued) • Cabling is sensitive to length and resistance • Controller does not demand CPU time • Used to wire 2+ disks simultaneously • (Eg. for mirroring in servers) • SCSI Devices may be installed on PC or MAC • MAC reads PC format • PC will not read MAC format

  7. SCSI ( continued) • SCSI-1 8 bit bus, transfers data at 5MB/sec for <= 7 devices • SCSI-2 ( fast SCSI), • 8 bit bus at 10 MB/sec • Wide SCSI 16 bit bus 10 MB/sec • Fast/wide 16 bit bus, 20 MB/sec • SCSI-3 Ultra SCSI, 40 MB/sec for <= 32 devices Supports both internal and external devices

  8. IDE • Less expensive than SCSI • Connects ONLY internal devices • PC motherboard supports 2 IDE controllers • Each connects 2 devices (master/slave) • Can combine 4 hard drives, CD-ROMS, etc. • ( Floppy drive is on separate controller)

  9. MCI • Allows any hardware (or software) device to be connected to a computer running Windows, using the appropriate device drivers. • Devices and drivers are managed by the system.ini file • See table p.70 – 72 for examples

  10. Memory and Storage • 1945- John Von Neumann, “father of the computer”, agreed to 4K RAM for the ENIAC, but added “ this is more memory than you will ever need”. • 2001 – average 128K – 256K average and most agree that “You never have enough memory or disk space.” • Buy as much RAM and hard drive space as you can afford. Multimedia text, graphics, animation use a lot of both….

  11. Random Access Memory ( RAM)and Read-Only Memory (ROM) • MAC- minimum RAM for multimedia is 32 MB ( 64-256K are common) • MPC- 8MB is minimum under MPC3 but 16-20 might be required ( newer WindowsNT, 2000 need > 64MB) • ROM – not volatile – holds BIOS program • OROM- optical ROM – write once- used in hand held devices

  12. Storage Devices • Floppy and hard drives • Zip, Jazz, SyQuest removable cartridges, CD-R( recordable) discs, videodiscs, DVDs, tape, other ….

  13. Output Devices • Audio- built into MAC; sound boards installed into PCs • Amplifiers and Speakers • Monitors (some multimedia use multiple monitors for editing) • Video devices • Projectors • Printers

  14. Communication Devices • Modems • ISDN – (Integrated Services Digital Network) – higher transmission using T1,T3, ATM, DSL services • Cable modems

  15. Input Devices • Keyboards • Mice • Trackballs, and touch pads • Touch screens • Magnetic card readers ( “smart cards” • Graphics tablets • Scanners • OCR (optical character recognition) devices • Infrared remotes ( wireless) • Voice recognition • Digital cameras

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