Logic gates and circuits · CS 0478 / 9618 Simulation

About this lab: Logic gates and circuits

Interactive simulation for Cambridge IGCSE Computer Science 0478 topic 10 and AS & A Level 9618 topics 3.2 and 15.2: switch the inputs of NOT, AND, OR, NAND, NOR and XOR gates, turn any logic expression into a circuit and truth table, solve problem statements, complete truth tables with working columns, and explore half adders, full adders, SR and JK flip-flops and Karnaugh maps.

IGCSE Computer Science 0478, topic 10, and A-Level 9618, topics 3.2 and 15.2. The six logic gates, circuits from logic expressions and problem statements, completing truth tables, then half and full adders, SR and JK flip-flops and Karnaugh maps for A-Level.

Logic gates and circuits is a free, browser-based simulation for Cambridge IGCSE Computer Science 0478 (topic 10 Boolean logic). The same lab serves both Cambridge IGCSE Computer Science 0478 and AS & A Level Computer Science 9618; tabs marked A-Level go beyond the IGCSE syllabus. The course is assessed in Paper 1 (Computer Systems), Paper 2 (Algorithms, Programming and Logic). Syllabus for examination in 2026-2028. There are 7 tabs, each a self-contained experiment with its own controls and live readings, and nothing to install: it runs on a laptop, tablet or classroom projector.

Syllabus coverage

10 (1-2) Logic gate symbols and functions. Lessons: The six logic gates.
10 (3) Logic circuits, truth tables and logic expressions. Lessons: Drawing logic circuits, Completing truth tables, Writing logic expressions.
9618 3.2 Logic Gates and Logic Circuits. Lessons: Logic gates, Logic circuits, truth tables and expressions.
9618 15.2 Boolean Algebra and Logic Circuits. Lessons: Boolean algebra, Karnaugh maps, Half adders, full adders and flip-flops.

Full syllabus map: IGCSE Computer Science 0478 topic 10, A Level Computer Science 9618 topic 3 and A Level Computer Science 9618 topic 15.

How to use this simulation

1. Logic gates.
2. Expression to circuit.
3. Problem statements.
4. Complete the truth table.
5. Adders.
6. Flip-flops.
7. Karnaugh maps.
The buttons at the end of the tab strip give the scene the whole window (Full screen, Hide controls) and, on a dark stage, a projector-friendly palette (Light scene). Many scenes also have drag handles: drag them to change the set-up directly.

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