We are in serious trouble

1
We are in serious trouble
http//www.imdb.com/title//

• Brendon Frasier in The Mummy (1999)

2
Computer Science 101Lecture 10
www.pjrc.com/tech/ 8051/board5/schematic.gif

• Spring Semester 2008
• Monday, February 4
• Week 5/18
• Albert H. Carlson

3
Announcements

• HW 2 is due on Friday, February 8
• First exam is coming up. But, because of snow
  days, I am moving it one week to Friday, February
  15. Get your HW done early.

4

• Drives
• Power Supply
• Case
• Monitor
• Gun
• Screen

5
The Parts of a Computer
Central Processing Unit (CPU)
Output
Input
6
Basic I/O
ON/OFF Switch
Keyboard
CPU
LEDs
Mouse/ Touchpad
External Drives
Printer
Network Card
Screen
7
Basic I/O

• We want to see what gives information to the
  computer and then gives information to us
• We call this the I/O of the system
• Input is what we give to the computer IN ANY
  FORM
• Output is what the computer gives us

8
Connections

• Each device must communicate to the CPU
• Communications are done via some kind of
  connection typically called a Bus
• Wireless is NOT a bus
• But, wireless still needs some kind of connection

9
What a Bus Is
From
Media
Nodes
To
10
Buses

• One, or more, wires
• Data can be sent one bit at a time or several
  bits at the same time
• Physical wire between points
• Standardized
• Buses have data rates in bits/second often
  called the baud rate

11
Internal Buses

• Industry Standard Architecture (ISA) Bus
• 8 MB/s 8/16 bit wide bus
• Peripheral Component Interconnect (PCI) Bus
• Made by Intel
• 266 MB/s max
• 32/64 bit wide bus

www.just2good.co.uk/ ioBusTypes.htm
12
Internal Buses, PCI
http//www.pctechguide.com/26interfaces_PCI_bus.ht
m
13
Internal Buses, IDE

• Integrated Drive Electronics (IDE) Bus and
  Enhanced IDE (EIDE)
• Made to transfer data between a hard disk and
  Processor
• Good up to 137GB

http//www.pctechguide.com/26interfaces_EIDE.htm
14
Serial vs. Parallel

• If the bus sends ONE bit per period, it is called
  serial
• A parallel bus sends more than one bit at a
  time. Usually it consists of several serial
  lines bundled together
• By definition, parallel buses have bigger
  connectors (ie, more pins) than serial connectors

15
Types of Buses

• USB Universal Serial Bus
• IEEE 1394 (Firewire)
• Phone Line RJ15 or RJ45
• PS2
• VGA/Monitor

http//en.wikipedia.org/wiki/Universal_Serial_Bus
www.reseaudirect.com/.../ RJ4520UTP
http//www.tigerdirect.com/applications/SearchTool
s/item-details.asp?EdpNo324242CatId81
common.nec-computers.com/
pcweb.mycom.co.jp/.../ ps2linux/images/vga.jpg
16
Keyboard

• Really a bunch of switches
• Press a Switch, a letter, number, or etc. is sent
  to the CPU
• Switch Debounce
• QWERTY Layout
• Polled

17
Questions?