Robert Grauer and Maryann Barber

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Robert Grauer and Maryann Barber The Purchase of a PC Robert Grauer and Maryann Barber

The PC, Then and Now IBM introduced the PC in 1981 in a three way partnership with Microsoft and Intel. The only place to buy a PC was from IBM. Today the PC is a commodity that runs microsoft compatible software on intel compatible hardware.

5 Components Microprocessor Internal Memory (RAM) Auxiliary Storage Input Units Output Units

Microprocessor Brain of the computer Six generations of Intel microprocessors 8088/8086, 80286, 386, 486 (all obsolete) Pentium (Classic and MMX) and Pentium Pro New generation is faster than previous one Multiple chips within the same generation at different clock speeds (MHz)

Internal Memory (RAM) Temporary (erased when power turned off) Measured in bytes 1 Kilobyte = 210 (~1,000 bytes) 1 Megabyte = 220 (~1,000,000 bytes) Need lots of RAM (16 - 32 Mb) Want to keep multiple programs &data files in memory Graphic intensive programs demand a lot of memory

Auxiliary Storage Permanent Storage Devices Floppy Disk (1.44MB) Hard (Fixed) Disk Built into machine Capacity Megabytes (~1,000,000 bytes) Gigabytes (~1,000,000,000 bytes) Access Time (measured in ms)

Auxiliary Storage (Continued) CD-ROM 650Mb Speed (Access time/Transfer Rate) 4X, 6X, 8X. 10X, 12X, and 16X CD-R and CD-RW (CD-E) drives DVD drives (4.7Gb-17Gb) Other Removable (e.g., Iomega Zip drive) Tape Backup

Input and Output Units Keyboard Mouse Trackball Scanner Joystick Pens Dot Matrix least expensive 24-pin Ink Jet b/w or color smears Lasers highest quality output

Output Units: Monitors 1280x1024 Adapter cards/monitor Video Memory (2-4MB) Resolution (pixels) 640x480 800x600 1024x768 1280x1024 Higher resolution, more information seen on screen Balance size of screen with selected resolution 800x600 640x480

Modems Fax/Modem 14.4Kbps 28.8Kbps 33.6Kbps ISDN Modem Cable Modem

MultiMedia Requirements CD-ROM drive Sound card Speakers MMX Technology

Purchasing Decisions Local store versus Mail Order Magazines Internet (www.bus.miami.edu/~rgrauer) Use Credit Card to double warranty 30 Day Price Guarantee Don’t Forget the Software Windows 95 (included) Office or Office Professional

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