For Unit 3, P3 in my Cisco work. I have uploaded this to explain input and output devices, the system bus, and north/south bridge.

1. P3-Represent
data flow
around the
computer
By George Smith-Moore

2. Block diagram of the
computer system.
Processing
Input
Output
Input
devices:
Output
devices:
It is used to insert
data into a
computational
device
Mouse
Keyboard
Joystick
Controller
It is used to retrieve
information from a
computational
device
CPU
Output
Input
Memory
Monitor
Projector
Speakers

3. CPU
MEMORY
INPUT AND
OUTPUT
It is used by the CPU to communicate with other devices
Address BUS
It is used to specify a physical address for the CPU
Data BUS
It allows the transfer of data between two components on the motherboard, or between two
computers.
System BUS
Control BUS

4. The Northbridge connects
with the faster I/O’s such as
the RAM and the AGP, the
Northbridge is bigger looking
than the Southbridge, the
Southbridge connects with
the slower I/O’s such as the
USB and the BIOS.
AGP
The Northbridge
and Southbridge
refer to the chipsets.
CPU
F
S
B
RAM
North Bridge
(GPU)
Legacy
PCI(e)
BIOS
South Bridge
USB
ISA
(Industry standard
architecture)
IDE
(integrated drive
electronics)