Titus Tsui

willowOS

• An SMP-aware Unix-like x86 64 operating system from first principles to study kernel architecture, multiprocessing, and scheduling mechanisms.

• Implements key subsystems including preemptive round-robin scheduling, ELF execution in userspace, and standard C library integration for a semi-compliant POSIX userspace via mlibc.

C • Assembly • Systems

Particle

Real-time interactive particle simulation built with Raylib and uses quadtrees for optimization.

C++ • Raylib • Graphics

Python Platformer

A shooter platformer game built with the Python Arcade library.

Python • Game Dev

16-bit Microcontroller

• A homebrewed 16-bit controller using logic gates, flip-flops, and multiplexers.

• Features a basic instruction set with four opcodes enabling 8-bit arithmetic with hardware optimized addition through four registers, dual 16-bit busses, a 16-bit sum/product register, and a central accumulator.

C • Embedded

Arrow Language + Compiler

Compiler for the Arrow programming language targeting 6502 assembly for retro hardware compatibility.

Python • Compiler Design

Image Classification

Neural network implementation for recognizing facial emotions.

Python • PyTorch