Input &
Output
1
2
Basic Machine Organization (15 hours)



Explain the functions of hardware within a
computer system, namely input and output
devices, the central processing unit, bus
system and storage devices (both primary
and secondary).
Explain the structure and functions of a
central processing unit (CPU) and its
components.
Outline the steps in the fetch-decodeexecute cycle and store using a single
processor, and describe the roles of and the
interdependence among components,
registers and buses in the machine cycle.
3
Basic Machine Organization (15 hours)


Describe the functions and characteristics of
Random Access Memory (RAM), Read Only
Memory (ROM) and memory cache. Realize
the relationship among the size of the
memory, the memory address, word length
and the performance of the computer.
Describe the features, advantages,
disadvantages and applications of the input
and output devices. Select and justify the use
of appropriate devices for collecting and
displaying information in a given context.
4
Basic Machine Organization (15 hours)
 Describe
the functional characteristics of
storage devices in terms of random or
sequential access, volatile or non-volatile,
data transfer rate and storage capacity.
 Outline the latest developments in
computer systems including processor
capabilities, primary memory
technologies, secondary storage devices
and data communications.
5
Remarks


Students should know how CPU is measured in
terms of frequency. Units such as
microsecond, nanosecond and picosecond
should also be introduced.
The functions of the program counter,
accumulator, instruction register, memory
address register and memory data register
should be briefly introduced to students. No
assembly language is involved but instructions
requiring LOAD, ADD, STORE and STOP may
be used to illustrate how data and instructions
are processed in the machine cycle.
6
Remarks
 Students’
understanding of main memory
should be extended to the current version
/ technologies in RAM and ROM in terms
of capacity and data access rate.
 The meanings of units such as terabytes,
gigabytes, megabytes and kilobytes
should be introduced. Also, the
distinction between prefixes used in
computer and the System International
(SI) notation should also be made (e.g.
1KB = 1024 Bytes, not 1000 Bytes).
7
Remarks



Students should know the various hardware
devices used for collecting and displaying
different types of data such as image, audio,
video and text.
Examples of storage devices are magnetic
disk, optical disk, flash memory, magnetic
tape and network storage. In understanding
the characteristics of storage devices,
students should be made aware of the trend
to faster and greater storage capacity but
smaller physical size over time.
Technical details are not required.
8
Input & Output Devices
 Describe
1.
2.
3.
4.

the
features,
advantages,
disadvantages and
applications
of the input and output devices.
9
Input Devices – Keyboard
Input Devices – Pointing
10
Input Devices – Video & Audio
11
Input Devices – Others
12
Input Devices
 Optical
character recognition (OCR)
 Optical mark recognition (OMR)
 Speech recognition software
 Fingerprint Scanner
 Hand geometry system
 Iris recognition system
 Light-sensitive processor
 Water-sensitive processor
 Radio Frequency Identifier (RFID)
13
Radio Frequency Identifier (RFID)
14
Current Future ??
 True

Multi-Touching
http://www.perceptivepixel.com/
 Combination
interface

of physical and virtual
http://www.youtube.com/watch?v=I2rDHU
Ukd5Y&feature=player_embedded
 Wii
Remote
 XBOX Kinect
15
Output Devices
16
Output Devices
Resolution
aspect ratio
Refresh rate
LCD
LED
CRT
17
Output Devices – Printer
Printer Resolution
Cost
hardcopy
dots per inch (dpi)
18
Input & Output Devices
 Select
and justify the use of appropriate
devices for collecting and displaying
information in a given context.
(image, audio, video and text)
19
Scenario.. ?
 Mouse
VS Track Pad
 Touch Screen VS Keyboard
 Barcode VS RFID
 Ink-Jet printer VS Laser Printer
 Projector VS LED display
20
Mr. Cheung has found a good passage in a
textbook. He wants to make a copy for
reference using a computer. He needs a
__________ and a printer.
A.
B.
C.
D.
scanner
bar code reader
touch screen
graph plotter
Question (HKCE 02CS Q28)
21
A teacher reads a good passage. She would like to
make a few amendments to the passage and
distribute the printout to her students. If she does not
want to re-type the whole passage again, which of
the following device/system would she use?
(1)
(2)
(3)
A.
B.
C.
D.
scanner
a optical character recognition system
a magnetic ink character recognition device
(1) only
(3) only
(1) and (2) only
(1), (2) and (3)
Question (HKCE 01CS Q24)
22
Which of the following input devices is most
suitable for a teacher wanting to enter his
students’ test marks into a computer?
A.
B.
C.
D.
a mouse
a scanner
a hand-writing pad
a numerical key pad
Question (HKCE 02IT Q13)
23
Under normal circumstances, when liquid crystal
display (LCD) monitors are compared with cathode
ray tube (CRT) monitors, which of the following
statements are correct?
(1)
(2)
(3)
(4)
LCD monitors are cheaper.
LCD monitors weigh less.
LCD monitors consume less electricity.
LCD monitors display more colors.
A.
B.
C.
D.
(1) and (2) only
(2) and (3) only
(2) and (4) only
(3) and (4) only
Question (HKCE 04CS Q33)
24
A person wants to capture the picture from a
leaflet for presentation. Which of the following
devices is most suitable for this task?
A.
B.
C.
D.
laser printer
scanner
modem
video camera
Question (HKCE 04IT Q1)
25
Which of the following are output devices?
(1) a 15-inch monitor
(2) a colour printer
(3) a 48X CD-ROM drive
A.
B.
C.
D.
(1) and (2) only
(1) and (3) only
(2) and (3) only
(1), (2) and (3)
Question (HKCE 02IT Q15)
26
Which of the following devices is both an input
and output device?
A.
B.
C.
D.
E.
keyboard
bar code scanner
floppy disk drive
joystick
printer
Question (HKCE 99CS Q15)
27
Storage Devices
 Describe
the functional characteristics of
storage devices in terms of
1.
2.
3.
4.
random or sequential access,
volatile or non-volatile,
data transfer rate and
storage capacity.
28
Storage Devices
 Examples

 In
of storage devices
magnetic disk, optical disk, flash memory,
magnetic tape and network storage.
understanding the characteristics of
storage devices, students should be
made aware of the trend to faster and
greater storage capacity but smaller
physical size over time.