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Computer Science IGCSEPDF 27
142 pagesrevision 46930
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○ The operand indicates where the operation should be
carried out.
○ Instruction sets include mnemonics and their binary
(machine code) equivalents.
○ Once decoded, the CPU matches the opcode to the
instruction set.
○ This tells the CPU what action to take during execution.
Instruction lists are machine specific
Programs made for one instruction set won’t run on a different
type.
Embedded Systems
An embedded system is a computer designed to perform a
specific task within a larger device.
Examples of embedded systems include:
○ Hospital equipment, washing machines, coffee machines,
satellite navigation systems, factory equipment, security
systems, traffic lights.
Characteristics of embedded system are
○ They are small
○ They use less power
○ They have lower cost
INPUT AND OUTPUT DEVICES
➤ Input Devices
● Input devices are hardware that let users send data or
commands to a computer for processing.
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