National 5 Computing
Science – Computer
Systems 2026 | Study
Guide, Practice Questions,
Answers, Rationales &
Exam Review | Complete
Ethics Study Guide
Updated 2026 Questions and Answers
100% Verified Exam Prep and Comprehensive
Rationales
Included
, Address Bus A uni directional bus that specifies the address location in memory to be read
from/written to.
Addressability Addressability is where each memory location has a unique hexadecimal address.
Anti-Virus Software Software that will scan files and programs to detect virus code.
Arithmetic and Logic Unit (ALU) The part of the processor responsible for performing arithmetic calculations and
logical operations such as AND,OR,NOT.
ASCII American Standard Code for Information Interchange. Extended ASCII is an 8 bit
code.
Assembler Translator program used to translate assembly language into machine code.
Assembly language A low level programming language used to program hardware. One line of assembly
code is translated into one line of machine code by an assembler.
Attributes When discussing vector images an attribute is a property of a shape - such as
centre(x,y) or radius or fillcolour etc.
Base 2 This is a numbering system that only has two digits. Binary - 0 OFF and 1 ON
Base 10 This is a numbering system that has 10 digits. 0-9
Binary The base 2 code system used in a computer system. It only has 2 states 0 (off) and
1 (on)
Bit A binary digit is a single 0 or 1 used in binary (0 is off, 1 is on)
Science – Computer
Systems 2026 | Study
Guide, Practice Questions,
Answers, Rationales &
Exam Review | Complete
Ethics Study Guide
Updated 2026 Questions and Answers
100% Verified Exam Prep and Comprehensive
Rationales
Included
, Address Bus A uni directional bus that specifies the address location in memory to be read
from/written to.
Addressability Addressability is where each memory location has a unique hexadecimal address.
Anti-Virus Software Software that will scan files and programs to detect virus code.
Arithmetic and Logic Unit (ALU) The part of the processor responsible for performing arithmetic calculations and
logical operations such as AND,OR,NOT.
ASCII American Standard Code for Information Interchange. Extended ASCII is an 8 bit
code.
Assembler Translator program used to translate assembly language into machine code.
Assembly language A low level programming language used to program hardware. One line of assembly
code is translated into one line of machine code by an assembler.
Attributes When discussing vector images an attribute is a property of a shape - such as
centre(x,y) or radius or fillcolour etc.
Base 2 This is a numbering system that only has two digits. Binary - 0 OFF and 1 ON
Base 10 This is a numbering system that has 10 digits. 0-9
Binary The base 2 code system used in a computer system. It only has 2 states 0 (off) and
1 (on)
Bit A binary digit is a single 0 or 1 used in binary (0 is off, 1 is on)
