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QMCS 200

QMCS 200. Lecture. Today’s Class. First hour Questions on homework Using WYSIWYG web page editors Recap the hardware hierarchy Hard Drives Printers Second hour MS Access Introduction. WYSIWYG Web Page Editing. Remember the ‘files’ making up a web page

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QMCS 200

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  1. QMCS 200 Lecture R. Smith - qmcs 200

  2. Today’s Class • First hour • Questions on homework • Using WYSIWYG web page editors • Recap the hardware hierarchy • Hard Drives • Printers • Second hour • MS Access Introduction R. Smith - qmcs 200

  3. WYSIWYG Web Page Editing • Remember the ‘files’ making up a web page • The HTML file, plus any image files (JPG, GIF) the page needs • Put them in the correct folder – easiest to put in same folder • Example Web Page Editors • Microsoft Front Page – on all campus machines • Adobe Dreamweaver – has been popular in QMCS • NVu – free, open source package • Creating the web page • Like MSWord produces a ‘doc’ file, this creates ‘htm’ files • Unlike MSWord, you must handle the image files separately • Lets you omit all <html> tags from your typing R. Smith - qmcs 200

  4. System Unit • Hierarchy • Power Supply • Drive Bays • Hard Drives • DVD/CD drives • Diskettes • Motherboard • I/O hardware • BIOS ROM • RAM • CPU R. Smith - qmcs 200

  5. Hard Drives and USBs • Hard drives rely on ‘physical’ spinning • Magnetics, heads and tracks • Progress = fitting more bits on less magnetic surface • USBs are integrated circuits that ‘remember’ their contents after power is turned off • Various bits of magic used to retain electrical charges • Old (expensive) RAMs magnetized bits of iron and read back which were magnetized R. Smith - qmcs 200

  6. Flash Memories: “USB Drives” • Flash is ‘electrically erasable ROM’ • When you read, you retrieve a value trapped between two transistors • Writing requires erasing • A special high charge erases the previous value • A new value is written • Bottom line: USBs get worn out if you write to them a lot • Good for music playback, “data archive” • I use mine to move data between home and work • “Sync” the files with special software at each end R. Smith - qmcs 200

  7. Hard Drives in Practice • Highest storage density of any technology • Vendors are good at fitting more bits on a magnetic surface • Mechanical requirements keep the costs up • 2 motors, finely engineered disk, shock protection, etc. • Implementation • Tracks and cylinders • Sectors • Formatting • “Low level” to write sectors to the disk • “High level” to support files and folders (ditto with USB) R. Smith - qmcs 200

  8. Printers • Common printers today • Ink jet – popular for graphics • Squirts ink onto the page • Squirting technology and ink establish the application • Laser printing – workhorse printing • Xerox/photocopy technology • Heat the paper surface, attach heat sensitive ink • “Toner cartridges” • Others • Impact – pretty much obsolete except for special applications • Plotters – for huge things; most are now inkjet • 3D – believe it or not R. Smith - qmcs 200

  9. MS Access • Elements of the database • Inputs • Storage • Outputs • Specifically • Forms for input • Import for input • Tables for storage • Queries for output • Reports for output • Export for output R. Smith - qmcs 200

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