Writing a Gameboy emulator in Ruby
summary
A Game Boy emulator written in Ruby with one tiny C SDL interface reproduces CPU, MMU, PPU and cartridge behavior; the Sharp LR35902 runs at 4.19 MHz 8‑bit CPU with ~256 opcodes, 64 KB address space and a tile-based 160×144 display that the PPU renders line‑by‑line at 60 Hz. Cartridge banking handles games up to 2 MB with 16 KB banks; timing uses CPU cycles (OAM 80 cycles, vblank 4560). Playability: Tetris fully playable, Zelda and Mario have rendering bugs.
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chapters (14)
- 0:00Intro
- 0:29Demo
- 4:14What is an emulator
- 6:17Registers
- 9:10Instructions
- 12:36Execution
- 14:02Cycles
- 15:03Memory
- 17:59Memory registers
- 19:59Picture processing units
- 24:43Visualisation
- 25:26Tile system
- 27:34Display system
- 29:34Cartridge
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