mamedev/mame
Jul 2023 – Apr 2026
17 Months active
Languages Used
C++LuaCreStructuredTextRSTmakefileShellrst
Technical Skills
C++ programmingdevice driver developmenthardware emulationembedded systemshardware interfacingC++
Olivier Galibert
PROFILE
Olivier Galibert
Over 17 months, contributed to the mamedev/mame repository by engineering core features and stability improvements across audio, emulation, and device subsystems. Delivered high-fidelity audio infrastructure, advanced effects processing, and robust device integration using C++ and Lua, while optimizing memory management and build systems for cross-platform reliability. Enhanced hardware emulation accuracy through low-level programming, DSP, and embedded systems expertise, addressing both feature delivery and critical bug fixes. The work included modular SCSI support, dynamic recompilation for CPUs, and comprehensive audio routing, resulting in broader hardware compatibility, improved user experience, and a maintainable codebase that supports future expansion and rigorous testing.
Overall Statistics
Feature vs Bugs
57%Features
Repository Contributions
168Total
Bugs
39
Commits
168
Features
51
Lines of code
191,236
Activity Months17
Your Network
162 peopleShared Repositories
110
Work History
April 2026
2 Commits • 1 Features
Apr 1, 2026April 2026 monthly summary for mamedev/mame. Focused on stability of the audio subsystem and maintainability of the codebase. Delivered targeted fixes and cleanups with clear business value and minimal risk to existing functionality.
2 Commits • 1 Features
Apr 1, 2026April 2026 monthly summary for mamedev/mame. Focused on stability of the audio subsystem and maintainability of the codebase. Delivered targeted fixes and cleanups with clear business value and minimal risk to existing functionality.
April 2026
March 2026
12 Commits • 2 Features
Mar 1, 2026March 2026: Focused on SCSI subsystem modernization and CPU core quality to improve compatibility, maintainability, and build reliability in mamedev/mame. Delivered modular external device support for SCSI, reworked HLE separation, and deslotification across multiple controllers; cleaned up legacy code paths and fixed build-time issues. These changes expand hardware compatibility, reduce maintenance costs, and strengthen the project’s contribution value.
March 2026
12 Commits • 2 Features
Mar 1, 2026March 2026: Focused on SCSI subsystem modernization and CPU core quality to improve compatibility, maintainability, and build reliability in mamedev/mame. Delivered modular external device support for SCSI, reworked HLE separation, and deslotification across multiple controllers; cleaned up legacy code paths and fixed build-time issues. These changes expand hardware compatibility, reduce maintenance costs, and strengthen the project’s contribution value.
January 2026
9 Commits • 3 Features
Jan 1, 2026January 2026 monthly summary focusing on key accomplishments and business impact. Delivered core features across the multimedia/graphics subsystem, Luna 68k DMA/video improvements, and storage I/O enhancements; included build stability improvements. Resulting impact includes higher fidelity hardware emulation, improved stability, and a more maintainable codebase, enabling faster integration of future features and broader software compatibility.
9 Commits • 3 Features
Jan 1, 2026January 2026 monthly summary focusing on key accomplishments and business impact. Delivered core features across the multimedia/graphics subsystem, Luna 68k DMA/video improvements, and storage I/O enhancements; included build stability improvements. Resulting impact includes higher fidelity hardware emulation, improved stability, and a more maintainable codebase, enabling faster integration of future features and broader software compatibility.
January 2026
December 2025
15 Commits • 2 Features
Dec 1, 2025December 2025 focused on delivering stability, expanded hardware support, and robust initialization across the MAME core for mamedev/mame. Key audio fixes eliminated long-running crashes and unsafe sample-rate changes, improving reliability of the sound subsystem. Enhanced IO and peripheral integration added interrupt handling, improved memory-mapped IO for boot monitor, and integrated CMC and SCSI interfaces with updated mappings to expand hardware coverage. SWP30 CPU dynamic recompilation support was added to broaden compatibility and realize better emulation performance. System initialization and transfer robustness improvements hardened startup paths and zero-transfer handling, preserving state safely during transfers. These efforts collectively increase emulation fidelity, reduce crash surfaces, and provide a stronger foundation for future hardware integrations.
December 2025
15 Commits • 2 Features
Dec 1, 2025December 2025 focused on delivering stability, expanded hardware support, and robust initialization across the MAME core for mamedev/mame. Key audio fixes eliminated long-running crashes and unsafe sample-rate changes, improving reliability of the sound subsystem. Enhanced IO and peripheral integration added interrupt handling, improved memory-mapped IO for boot monitor, and integrated CMC and SCSI interfaces with updated mappings to expand hardware coverage. SWP30 CPU dynamic recompilation support was added to broaden compatibility and realize better emulation performance. System initialization and transfer robustness improvements hardened startup paths and zero-transfer handling, preserving state safely during transfers. These efforts collectively increase emulation fidelity, reduce crash surfaces, and provide a stronger foundation for future hardware integrations.
November 2025
10 Commits • 3 Features
Nov 1, 2025November 2025: Delivered substantive improvements to the mamedev/mame project with a focus on DSP563xx emulation, audio synthesis, and multi-device I/O. The DSP563xx work significantly increased emulator fidelity and test coverage through loop/subroutine interaction fixes, do/dor corrections, opcode display enhancements, and new unit tests (including a virtual driver). The SWP00 audio subsystem was overhauled with ADC16 integration to enable richer synthesis and effects, improving audio quality in affected titles. Added 80C51 slave address and mask register I/O to support multi-device configurations and updated start/address mapping for multi-device environments. These changes collectively reduce regression risk, expand hardware compatibility, and enable more accurate hardware reproduction and debugging in complex board setups.
10 Commits • 3 Features
Nov 1, 2025November 2025: Delivered substantive improvements to the mamedev/mame project with a focus on DSP563xx emulation, audio synthesis, and multi-device I/O. The DSP563xx work significantly increased emulator fidelity and test coverage through loop/subroutine interaction fixes, do/dor corrections, opcode display enhancements, and new unit tests (including a virtual driver). The SWP00 audio subsystem was overhauled with ADC16 integration to enable richer synthesis and effects, improving audio quality in affected titles. Added 80C51 slave address and mask register I/O to support multi-device configurations and updated start/address mapping for multi-device environments. These changes collectively reduce regression risk, expand hardware compatibility, and enable more accurate hardware reproduction and debugging in complex board setups.
November 2025
October 2025
13 Commits • 4 Features
Oct 1, 20252025-10 monthly summary for mamedev/mame focused on delivering architecture-cleaning refactors, hardware-accurate ROM/BIOS handling, and reliability improvements across core emulators, increasing maintainability and hardware fidelity while addressing a critical debugger memory-fill bug.
October 2025
13 Commits • 4 Features
Oct 1, 20252025-10 monthly summary for mamedev/mame focused on delivering architecture-cleaning refactors, hardware-accurate ROM/BIOS handling, and reliability improvements across core emulators, increasing maintainability and hardware fidelity while addressing a critical debugger memory-fill bug.
September 2025
19 Commits • 4 Features
Sep 1, 2025September 2025 performance summary for mamedev/mame highlights a concentrated effort on core emulation accuracy, memory efficiency, and audio/video fidelity, delivering substantial business value through faster, more stable emulation and improved CI reliability. Key feature work expanded hardware coverage and reliability across multiple subsystems, while targeted bug fixes reduced crash risk and build failures. Overall impact includes higher emulation performance, better stability, broader hardware support, and more maintainable code.
19 Commits • 4 Features
Sep 1, 2025September 2025 performance summary for mamedev/mame highlights a concentrated effort on core emulation accuracy, memory efficiency, and audio/video fidelity, delivering substantial business value through faster, more stable emulation and improved CI reliability. Key feature work expanded hardware coverage and reliability across multiple subsystems, while targeted bug fixes reduced crash risk and build failures. Overall impact includes higher emulation performance, better stability, broader hardware support, and more maintainable code.
September 2025
August 2025
1 Commits • 1 Features
Aug 1, 2025Month: 2025-08 — Delivered Atari ST ROM Cartridge support in mamedev/mame. Implemented ROM device type, integrated into the cartridge connector to load and emulate ROM-based software, and added new C++ sources and configuration to recognize the hardware. No major bugs documented for this feature; focused on feature delivery and groundwork for testing and future extensions. This work expands platform coverage and enhances emulation fidelity, enabling ROM cartridge workflows and potential business value for platforms relying on ROM-based software.
August 2025
1 Commits • 1 Features
Aug 1, 2025Month: 2025-08 — Delivered Atari ST ROM Cartridge support in mamedev/mame. Implemented ROM device type, integrated into the cartridge connector to load and emulate ROM-based software, and added new C++ sources and configuration to recognize the hardware. No major bugs documented for this feature; focused on feature delivery and groundwork for testing and future extensions. This work expands platform coverage and enhances emulation fidelity, enabling ROM cartridge workflows and potential business value for platforms relying on ROM-based software.
July 2025
4 Commits • 1 Features
Jul 1, 2025July 2025 monthly summary for mamedev/mame: Key features delivered and major bug fixes with business value. 1) Key features delivered: Sound System Robustness and Device Handling improvements, including device fallback when default devices are missing, startup log cleanup, generation state tracking, and proper cleanup differentiation between input and output devices. 2) Major bugs fixed: CPS1 Driver Timing Synchronization with VPA; corrected CPU space mapping to reflect VPA timing and added synchronization plus a delay before the interrupt acknowledge read. 3) Overall impact and accomplishments: Increased startup reliability, reduced crashes related to device initialization, improved CPS1 emulation fidelity, and cleaner codebase for sound subsystem; these changes improve user experience, gameplay accuracy, and maintainability. 4) Technologies/skills demonstrated: C++ emulation development, timing modeling, device management, logging instrumentation, and debugging across audio and CPS1 subsystems.
4 Commits • 1 Features
Jul 1, 2025July 2025 monthly summary for mamedev/mame: Key features delivered and major bug fixes with business value. 1) Key features delivered: Sound System Robustness and Device Handling improvements, including device fallback when default devices are missing, startup log cleanup, generation state tracking, and proper cleanup differentiation between input and output devices. 2) Major bugs fixed: CPS1 Driver Timing Synchronization with VPA; corrected CPU space mapping to reflect VPA timing and added synchronization plus a delay before the interrupt acknowledge read. 3) Overall impact and accomplishments: Increased startup reliability, reduced crashes related to device initialization, improved CPS1 emulation fidelity, and cleaner codebase for sound subsystem; these changes improve user experience, gameplay accuracy, and maintainability. 4) Technologies/skills demonstrated: C++ emulation development, timing modeling, device management, logging instrumentation, and debugging across audio and CPS1 subsystems.
July 2025
June 2025
13 Commits • 5 Features
Jun 1, 2025June 2025 (mamedev/mame): Delivered a set of audio subsystem enhancements and stability improvements that improve portability, fidelity, and robustness for emulation across platforms. Implemented a compile-time option to disable threading in the sound system to support non-threaded environments (e.g., Emscripten) and added a comprehensive reverb feature with OSD integration and LFE support. Removed the hard 20 kHz resampling ceiling to enable higher sample rates in the future, and introduced accurate stereo routing for Sega Multi32. A broad suite of stability fixes across audio/video initialization and resampling logic further improves reliability and correctness in emulation.
June 2025
13 Commits • 5 Features
Jun 1, 2025June 2025 (mamedev/mame): Delivered a set of audio subsystem enhancements and stability improvements that improve portability, fidelity, and robustness for emulation across platforms. Implemented a compile-time option to disable threading in the sound system to support non-threaded environments (e.g., Emscripten) and added a comprehensive reverb feature with OSD integration and LFE support. Removed the hard 20 kHz resampling ceiling to enable higher sample rates in the future, and introduced accurate stereo routing for Sega Multi32. A broad suite of stability fixes across audio/video initialization and resampling logic further improves reliability and correctness in emulation.
May 2025
48 Commits • 15 Features
May 1, 2025May 2025 monthly summary for mamedev/mame: Major audio subsystem enhancements delivered across the backend stack, with focus on performance, stability, and configurability. Notable progress in the LoFi resampler, speaker handling, and back-end architecture, driving better user experience and emulation fidelity.
48 Commits • 15 Features
May 1, 2025May 2025 monthly summary for mamedev/mame: Major audio subsystem enhancements delivered across the backend stack, with focus on performance, stability, and configurability. Notable progress in the LoFi resampler, speaker handling, and back-end architecture, driving better user experience and emulation fidelity.
May 2025
April 2025
11 Commits • 1 Features
Apr 1, 2025Concise monthly summary for 2025-04 focusing on key technical and business value achievements for mamedev/mame.
April 2025
11 Commits • 1 Features
Apr 1, 2025Concise monthly summary for 2025-04 focusing on key technical and business value achievements for mamedev/mame.
January 2025
1 Commits • 1 Features
Jan 1, 2025January 2025 performance summary for mamedev/mame. Delivered a feature that improves the floppy disk workflow by automatically initiating the ready dance on disk insertion, even when the motor is configured to stay always on. This reduces insertion latency and provides a more responsive and consistent user experience for disk-based I/O. All changes are tracked under the referenced commit, ensuring traceability. No major bugs fixed this month; focus was on feature delivery, code reliability, and subsystem stability within the floppy/emulation stack.
1 Commits • 1 Features
Jan 1, 2025January 2025 performance summary for mamedev/mame. Delivered a feature that improves the floppy disk workflow by automatically initiating the ready dance on disk insertion, even when the motor is configured to stay always on. This reduces insertion latency and provides a more responsive and consistent user experience for disk-based I/O. All changes are tracked under the referenced commit, ensuring traceability. No major bugs fixed this month; focus was on feature delivery, code reliability, and subsystem stability within the floppy/emulation stack.
January 2025
November 2024
4 Commits • 4 Features
Nov 1, 2024November 2024: Consolidated foundational emulation and codebase improvements for mamedev/mame. Delivered Polysix groundwork with sound generation and persistence; completed codebase maintenance to reflect matured mindset code; introduced CPU access retry mechanism and bus contention documentation to improve timing reliability; added MKS3 Low-Level Emulation for the Yamaha HD6305V0 MCU to broaden hardware support. No major bugs fixed this month; focus on stability, maintainability, and extensibility.
November 2024
4 Commits • 4 Features
Nov 1, 2024November 2024: Consolidated foundational emulation and codebase improvements for mamedev/mame. Delivered Polysix groundwork with sound generation and persistence; completed codebase maintenance to reflect matured mindset code; introduced CPU access retry mechanism and bus contention documentation to improve timing reliability; added MKS3 Low-Level Emulation for the Yamaha HD6305V0 MCU to broaden hardware support. No major bugs fixed this month; focus on stability, maintainability, and extensibility.
October 2024
4 Commits • 3 Features
Oct 1, 2024October 2024: Focused on delivering high-fidelity hardware emulation and improved user workflow in mamedev/mame. Major work includes a full Korg Polysix driver implementation, expanded MKS3 device support for Yamaha PSR540, and MIDI port selection UI enhancements. These changes raise emulation accuracy, broaden device compatibility, and streamline MIDI configuration for end users.
4 Commits • 3 Features
Oct 1, 2024October 2024: Focused on delivering high-fidelity hardware emulation and improved user workflow in mamedev/mame. Major work includes a full Korg Polysix driver implementation, expanded MKS3 device support for Yamaha PSR540, and MIDI port selection UI enhancements. These changes raise emulation accuracy, broaden device compatibility, and streamline MIDI configuration for end users.
October 2024
May 2024
1 Commits
May 1, 2024Concise monthly summary for 2024-05 focused on key accomplishments, bug fixes, and overall impact for mamedev/mame.
May 2024
1 Commits
May 1, 2024Concise monthly summary for 2024-05 focused on key accomplishments, bug fixes, and overall impact for mamedev/mame.
July 2023
1 Commits • 1 Features
Jul 1, 2023Month: July 2023 – mamedev/mame: Delivered external MMU support and new device drivers for Apple parallel port devices and quadrature mouse emulation. Core updates to improve external MMU handling (commit 63a40168225a343dcc9a4098daedbdc8e7a371eb). Identified documentation gaps and initiated groundwork to support future driver contributions. Result: expanded hardware compatibility and improved readiness for driver development and external hardware emulation, with a clear path for community involvement.
1 Commits • 1 Features
Jul 1, 2023Month: July 2023 – mamedev/mame: Delivered external MMU support and new device drivers for Apple parallel port devices and quadrature mouse emulation. Core updates to improve external MMU handling (commit 63a40168225a343dcc9a4098daedbdc8e7a371eb). Identified documentation gaps and initiated groundwork to support future driver contributions. Result: expanded hardware compatibility and improved readiness for driver development and external hardware emulation, with a clear path for community involvement.
July 2023
Activity
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Quality Metrics
Correctness87.2%
Maintainability86.8%
Architecture83.6%
Performance80.0%
AI Usage20.8%
Skills & Technologies
Programming Languages
AssemblyCC++LuaRSTShellmakefilereStructuredTextrst
Technical Skills
Audio ConfigurationAudio DevelopmentAudio EffectsAudio Effects ProcessingAudio EmulationAudio EngineeringAudio Hardware ConfigurationAudio ProcessingAudio ProgrammingAudio RoutingAudio SimulationAudio SynthesisAudio SystemsBug FixingBuild System
Repositories Contributed To
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