CPU architecture, parallel processing, assembly language, operating systems, floating point, databases, file organisation, cryptography, and biometrics — all ten Unit 4 topics in one gamified skill path. Earn XP, collect stars, and build your exam readiness topic by topic.
Work through each topic in order. Click any unlocked node to launch the quiz. Earn three stars to master a topic and unlock the next one.
Past paper mark scheme language, distilled into ten topic cards. Click Quick Quiz on any card to test yourself instantly.
The Unit 4 paper regularly tests Amdahl’s Law, binary arithmetic, floating point conversion, and number representation. Use these tools to practise the calculations directly.
Calculate parallel speedup using Amdahl’s Law. Enter the parallel fraction P (0–1) and number of processors N. Shows step-by-step working just as the exam requires.
Convert between denary, binary (8-bit), and hexadecimal. Enter a value in any field and convert all three formats at once.
Convert a denary value (positive or negative) to two’s complement binary. Shows every step: positive representation, invert, add 1.
Convert a positive denary value to normalised floating point. Specify mantissa and exponent bit widths to match the exam question.
Add two denary values using 8-bit binary. Shows full working including carry bits and overflow detection.
Perform left arithmetic shifts on an 8-bit two’s complement value. Detects overflow and shows the effect on the denary value at each step.
Key Unit 4 terms and definitions. Click the card to flip it, then mark whether you know it. Cards you mark as unknown cycle back around. Earn +5 XP for every card you know.
Trace through the assembly code lock, the FDE cycle, Amdahl’s Law, and floating point conversion one step at a time. Earn 10 XP for completing each trace.
Earn XP by completing quizzes and using the interactive tools. Your score updates live as you work through the topics.