{"id":42123758,"url":"https://github.com/akelsh/mono-gb","last_synced_at":"2026-01-26T15:01:27.864Z","repository":{"id":331625231,"uuid":"1113984891","full_name":"akelsh/mono-gb","owner":"akelsh","description":"A relatively cycle-accurate Gameboy color emulator built in modern C++","archived":false,"fork":false,"pushed_at":"2026-01-26T13:04:27.000Z","size":10929,"stargazers_count":1,"open_issues_count":0,"forks_count":0,"subscribers_count":0,"default_branch":"main","last_synced_at":"2026-01-26T13:09:01.338Z","etag":null,"topics":["cplusplus","cpp","cpu","educational","emulator","gameboy","hardware-emulation","low-level","nintendo","retro"],"latest_commit_sha":null,"homepage":"","language":"C++","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":"mit","status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/akelsh.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":"LICENSE","code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null,"governance":null,"roadmap":null,"authors":null,"dei":null,"publiccode":null,"codemeta":null,"zenodo":null,"notice":null,"maintainers":null,"copyright":null,"agents":null,"dco":null,"cla":null}},"created_at":"2025-12-10T18:27:55.000Z","updated_at":"2026-01-26T13:04:30.000Z","dependencies_parsed_at":null,"dependency_job_id":null,"html_url":"https://github.com/akelsh/mono-gb","commit_stats":null,"previous_names":["akelsh/mono-gb"],"tags_count":0,"template":false,"template_full_name":null,"purl":"pkg:github/akelsh/mono-gb","repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/akelsh%2Fmono-gb","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/akelsh%2Fmono-gb/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/akelsh%2Fmono-gb/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/akelsh%2Fmono-gb/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/akelsh","download_url":"https://codeload.github.com/akelsh/mono-gb/tar.gz/refs/heads/main","sbom_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/akelsh%2Fmono-gb/sbom","scorecard":null,"host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":286080680,"owners_count":28781308,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2026-01-26T13:55:28.044Z","status":"ssl_error","status_checked_at":"2026-01-26T13:55:26.068Z","response_time":59,"last_error":"SSL_read: unexpected eof while reading","robots_txt_status":"success","robots_txt_updated_at":"2025-07-24T06:49:26.215Z","robots_txt_url":"https://github.com/robots.txt","online":false,"can_crawl_api":true,"host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":["cplusplus","cpp","cpu","educational","emulator","gameboy","hardware-emulation","low-level","nintendo","retro"],"created_at":"2026-01-26T15:01:25.551Z","updated_at":"2026-01-26T15:01:27.851Z","avatar_url":"https://github.com/akelsh.png","language":"C++","funding_links":[],"categories":[],"sub_categories":[],"readme":"# Mono-GB\n\n![Gameboy Games Showcase](assets/showcase.gif)\n\nMono-GB is a relatively cycle-accurate Gameboy color emulator built in modern C++. Despite the name, the emulator\nfully supports both DMG and CGB games in full color.\n\nThis is a hobby project with the main goal being to understand the intricacies of low-level system design.\n\n## Features\n\nThe following is a list of fully implemented features:\n\n- Backwards compatibility with the original Gameboy.\n- Machine Cycle accurate CPU.\n- Dual-speed support\n- Support for MBC1, MBC2, MBC3, and MBC5.\n- DMG colorization.\n- Dot accurate PPU sprite \u0026 BG pipelines.\n- Phase-based instruction execution.\n\nThis project is still a work in progress. The following is a list of features I am planning on implementing:\n\n- Audio support.\n- T-state based instruction execution.\n- A fully functional debugger.\n\n## Tests\n\nThe accuracy of a gameboy emulator is usually determined by test ROMs that are created using the real hardware.\n\nThe following is a list of the ROM tests that Mono GB passes:\n\n- [Blargg's ROM tests](https://github.com/retrio/gb-test-roms):\n    - [cpu_instrs](https://github.com/retrio/gb-test-roms/tree/master/cpu_instrs)\n    - [halt_bug](https://github.com/retrio/gb-test-roms/blob/master/halt_bug.gb)\n    - [interrupt_time](https://github.com/retrio/gb-test-roms/tree/master/interrupt_time) (Note: Failure is expected on\n      CGB)\n    - [instr_timing](https://github.com/retrio/gb-test-roms/tree/master/instr_timing)\n    - [mem_timing](https://github.com/retrio/gb-test-roms/tree/master/mem_timing)\n    - [mem_timing-2](https://github.com/retrio/gb-test-roms/tree/master/mem_timing-2)\n- [Mooneye test suite](https://github.com/Gekkio/mooneye-test-suite)\n    - [acceptance/add_sp_e_timing](https://github.com/Gekkio/mooneye-test-suite/blob/main/acceptance/add_sp_e_timing.s)\n    - [acceptance/call_cc_timing](https://github.com/Gekkio/mooneye-test-suite/blob/main/acceptance/call_cc_timing.s)\n    - [acceptance/call_cc_timing2](https://github.com/Gekkio/mooneye-test-suite/blob/main/acceptance/call_cc_timing2.s)\n    - [acceptance/call_timing](https://github.com/Gekkio/mooneye-test-suite/blob/main/acceptance/call_timing.s)\n    - [acceptance/call_timing2](https://github.com/Gekkio/mooneye-test-suite/blob/main/acceptance/call_timing2.s)\n    - [acceptance/div_timing](https://github.com/Gekkio/mooneye-test-suite/blob/main/acceptance/div_timing.s)\n    - [acceptance/ei_timing](https://github.com/Gekkio/mooneye-test-suite/blob/main/acceptance/ei_timing.s)\n    - [acceptance/halt_ime0_ei](https://github.com/Gekkio/mooneye-test-suite/blob/main/acceptance/halt_ime0_ei.s)\n    - [acceptance/if_ie_registers](https://github.com/Gekkio/mooneye-test-suite/blob/main/acceptance/if_ie_registers.s)\n    - [acceptance/if_ie_registers](https://github.com/Gekkio/mooneye-test-suite/blob/main/acceptance/if_ie_registers.s)\n    - [acceptance/intr_timing](https://github.com/Gekkio/mooneye-test-suite/blob/main/acceptance/intr_timing.s)\n    - [acceptance/jp_cc_timing](https://github.com/Gekkio/mooneye-test-suite/blob/main/acceptance/jp_cc_timing.s)\n    - [acceptance/jp_timing](https://github.com/Gekkio/mooneye-test-suite/blob/main/acceptance/jp_timing.s)\n    - [acceptance/ld_hl_sp_e_timing](https://github.com/Gekkio/mooneye-test-suite/blob/main/acceptance/ld_hl_sp_e_timing.s)\n    - [acceptance/oam_dma_restart](https://github.com/Gekkio/mooneye-test-suite/blob/main/acceptance/oam_dma_restart.s)\n    - [acceptance/oam_dma_start](https://github.com/Gekkio/mooneye-test-suite/blob/main/acceptance/oam_dma_start.s)\n    - [acceptance/oam_dma_timing](https://github.com/Gekkio/mooneye-test-suite/blob/main/acceptance/oam_dma_timing.s)\n    - [acceptance/pop_timing](https://github.com/Gekkio/mooneye-test-suite/blob/main/acceptance/pop_timing.s)\n    - [acceptance/push_timing](https://github.com/Gekkio/mooneye-test-suite/blob/main/acceptance/push_timing.s)\n    - [acceptance/ret_cc_timing](https://github.com/Gekkio/mooneye-test-suite/blob/main/acceptance/ret_cc_timing.s)\n    - [acceptance/ret_timing](https://github.com/Gekkio/mooneye-test-suite/blob/main/acceptance/ret_timing.s)\n    - [acceptance/reti_intr_timing](https://github.com/Gekkio/mooneye-test-suite/blob/main/acceptance/reti_intr_timing.s)\n    - [acceptance/reti_timing](https://github.com/Gekkio/mooneye-test-suite/blob/main/acceptance/reti_timing.s)\n    - [acceptance/rst_timing](https://github.com/Gekkio/mooneye-test-suite/blob/main/acceptance/rst_timing.s)\n    - [acceptance/bits/mem_oam](https://github.com/Gekkio/mooneye-test-suite/blob/main/acceptance/bits/mem_oam.s)\n    - [acceptance/bits/reg_f](https://github.com/Gekkio/mooneye-test-suite/blob/main/acceptance/bits/reg_f.s)\n    - [acceptance/instr](https://github.com/Gekkio/mooneye-test-suite/blob/main/acceptance/instr)\n    - [acceptance/interrupts](https://github.com/Gekkio/mooneye-test-suite/blob/main/acceptance/interrupts)\n    - [acceptance/oam_dma/basic](https://github.com/Gekkio/mooneye-test-suite/blob/main/acceptance/oam_dma/basic.s)\n    - [acceptance/oam_dma/reg_read](https://github.com/Gekkio/mooneye-test-suite/blob/main/acceptance/oam_dma/reg_read.s)\n    - [acceptance/timer](https://github.com/Gekkio/mooneye-test-suite/blob/main/acceptance/timer)\n    - [acceptance/emulator-only/mbc1](https://github.com/Gekkio/mooneye-test-suite/blob/main/emulator-only/mbc1)\n    - [acceptance/emulator-only/mbc2](https://github.com/Gekkio/mooneye-test-suite/blob/main/emulator-only/mbc2)\n    - [acceptance/emulator-only/mbc5](https://github.com/Gekkio/mooneye-test-suite/blob/main/emulator-only/mbc5)\n- [rtc3-test](https://github.com/aaaaaa123456789/rtc3test)\n- [cgb-acid-2](https://github.com/mattcurrie/cgb-acid2)\n- [dmg-acid-2](https://github.com/mattcurrie/dmg-acid2)\n- [cgb-acid-hell](https://github.com/mattcurrie/cgb-acid-hell)\n\n## Build\n\nMono-GB uses CMake presets for building. Ensure you have CMake (3.21+), Ninja, and a C++23 compatible compiler\ninstalled.\n\n### Unix-like (Linux/macOS)\n\nTo build for release:\n\n```bash\n# Configure the project\ncmake --preset unixlike-gcc-release\n\n# Build the project\ncmake --build out/build/unixlike-gcc-release\n```\n\n### Windows (MSVC)\n\nTo build for release:\n\n```bash\n# Configure the project\ncmake --preset windows-msvc-release-user-mode\n\n# Build the project\ncmake --build out/build/windows-msvc-release-user-mode\n```\n\n## Running\n\nAfter building, the executable can be found in the `src` directory within the build folder.\n\n```bash\n# Unix-like\n./out/build/unixlike-gcc-release/src/mono_gb\n\n# Windows\n./out/build/windows-msvc-release-user-mode/src/RelWithDebInfo/mono_gb.exe\n```\n\n## Credits\n\nResources:\n\n- [Gameboy Pandocs](https://gbdev.io/pandocs/)\n- [Game Boy: Complete Technical Reference](https://gekkio.fi/files/gb-docs/gbctr.pdf)\n\nShowcase Games:\n\n- [FEED IT SOULS](https://gumpyfunction.itch.io/feed-it-souls)\n- [Taiyaki Fabulous Museum of Fishes](https://objetdiscret.itch.io/tai-fab-museum)\n\nTests:\n\n- [Blargg's ROM tests](https://github.com/retrio/gb-test-roms)\n- [Mooneye test suite](https://github.com/Gekkio/mooneye-test-suite)\n- [rtc3-test](https://github.com/aaaaaa123456789/rtc3test)\n- [cgb-acid-2](https://github.com/mattcurrie/cgb-acid2)\n- [dmg-acid-2](https://github.com/mattcurrie/dmg-acid2)\n- [cgb-acid-hell](https://github.com/mattcurrie/cgb-acid-hell)\n- [GameboyCPUTests](https://github.com/adtennant/GameboyCPUTests)\n\nUI\n\n- [Tamzen font](https://github.com/sunaku/tamzen-font)\n\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fakelsh%2Fmono-gb","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fakelsh%2Fmono-gb","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fakelsh%2Fmono-gb/lists"}