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

Chapter 4B Hardware Peripherals

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

Computer-System Architecture

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:

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

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

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)

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

Memory and Storage 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” – 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….

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

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

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

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

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