The Purchase of a PC Robert Grauer and

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The Purchase of a PC Robert Grauer and Maryann Barber

The PC, Then and Now l 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. l Today the PC is a commodity that runs microsoft compatible software on intel compatible hardware.

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

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

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

Auxiliary Storage Permanent Storage Devices l Floppy Disk (1. 44 MB) l Hard (Fixed) Disk l – Built into machine – Capacity l Megabytes (~1, 000 bytes) l Gigabytes (~1, 000, 000 bytes) – Access Time (measured in ms)

Auxiliary Storage (Continued) CD-ROM – 650 Mb – Speed (Access time/Transfer Rate) l 4 X, 6 X, 8 X. 10 X, 12 X, and 16 X – CD-R and CD-RW (CD-E) drives – DVD drives (4. 7 Gb-17 Gb) l Other – Removable (e. g. , Iomega Zip drive) – Tape Backup l

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

Output Units: Monitors l Adapter cards/monitor 1280 x 1024 – Video Memory (2 -4 MB) l Resolution (pixels) 800 x 600 – 640 x 480 – 800 x 600 – 1024 x 768 – 1280 x 1024 – Higher resolution, more information seen on screen l Balance size of screen with selected resolution

Modems Fax/Modem – 14. 4 Kbps – 28. 8 Kbps – 33. 6 Kbps l ISDN Modem l Cable Modem l

Multi. Media Requirements CD-ROM drive l Sound card l Speakers l MMX Technology l

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

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