fetch-decode-execute

CPU emulator featuring a custom instruction set, two-pass assembler, interactive debugger, interrupts, privilege modes, virtual peripherals, and preemptive multitasking.

Demo of a Von Neumann architecture

How does a computer work? An interactive, open-source explainer. Glassbox No. 074.

A C++20 RISC-style CPU simulator with an assembler, binary program format, loader, and debugger.

A CHIP-8 emulator with a pure-Python, headless-testable core and a pygame frontend — full instruction set, two historical quirk profiles, golden-master snapshot testing against the Timendus suite, built-in disassembler, and a pause/step debug mode.

A high-level Java program which simulates the operation of the “Shark Machine” (the hardware component) via a rudimentary “SharkOS” (the software component) that has multitasking capabilities. It was originally commissioned by Nova Southeastern University in 2022 as part of the CSIS 3810 Operating Systems Concepts course curriculum.

Minimal working implementation of a cpu at the transistor level. You can observe the inner workings of a cpu, bus, EEPROM lookup table, ALU, A and B registers, run and program mode, fetch decode execute cycle, clock frequency, simultaneously. You can write assembly and hand code it using a 4-bit memory address into 16 bytes of RAM.

Educational 8-bit CPU simulator in the browser: a faithful web port of CPU-8E (IESB), with documentation in Portuguese and English.