I built a Game Boy emulator in F#
nickkossolapov.github.io
April 30, 2026
22 min read
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57/100
Summary
Nick Kossolapov developed a Game Boy emulator using F# to deepen his understanding of computer functionality. The project was inspired by his childhood experiences with the Game Boy and aims to emulate its hardware in a simplified manner.
Key Takeaways
- Nick Kossolapov developed a Game Boy emulator called Fame Boy using F#, which includes sound and runs on both desktop and web platforms.
- The emulator's architecture mimics the actual Game Boy hardware, with a CPU that interacts with a memory map and an IO controller for managing hardware registers.
- The Fame Boy emulator operates in a single-threaded manner, synchronizing all components through a central stepper function to maintain the correct number of cycles per second for gameplay.
- Kossolapov previously built a CHIP-8 emulator to gain experience in emulator development before tackling the more complex Game Boy emulator.
Community Sentiment
Positives
- Building a Game Boy emulator in F# showcases the language's capabilities, highlighting its potential for creative and educational projects in programming.
- Emulators serve as an excellent way to learn a programming language, allowing developers to engage deeply with both the language and the underlying hardware.
- The discussion around optimizing F# for performance indicates a growing understanding of how to balance functional programming with imperative techniques for efficiency.
Concerns
- Concerns about the performance of F# for certain applications suggest that while it has strengths, it may not always be the best choice for speed-critical tasks.
- The negative experiences with LLMs, particularly in terms of plagiarism and lack of genuine understanding, raise ethical concerns about AI's role in programming education.
