mamedev/mame
Jan 2025 – Jul 2026
13 Months active
Languages Used
C++LuaXML
Technical Skills
Audio SynthesisC++ DevelopmentEmbedded SystemsEmulationEmulation DevelopmentHardware Simulation
Devin Acker
PROFILE
Devin Acker
Over thirteen months, contributed to mamedev/mame by developing and refining hardware emulation features, focusing on audio synthesis, device drivers, and embedded systems. Delivered support for legacy musical instruments, printers, and arcade systems, implementing new drivers and expanding hardware coverage. Used C++, Lua, and XML to build accurate emulation paths, stabilize memory mapping, and enhance audio processing fidelity. Addressed critical bugs in CPU and sound chip emulation, improved configuration management, and standardized input layouts for keyboards. The work emphasized maintainable code, incremental feature delivery, and alignment with hardware specifications, enabling more reliable emulation and supporting both preservation and developer testing needs.
Overall Statistics
Feature vs Bugs
74%Features
Repository Contributions
39Total
Bugs
9
Commits
39
Features
26
Lines of code
15,147
Activity Months13
Your Network
119 peopleWork History
July 2026
1 Commits
Jul 1, 2026July 2026 Monthly Summary for mamedev/mame: Focused on correctness of NEC CPU emulation during division operations. Delivered a targeted bug fix to align carry and overflow flag behavior with observed hardware results, including proper handling of divide-by-zero and overflow conditions. Updated instruction dispatch and division macros to reflect NEC hardware semantics, reducing inconsistencies in division paths. This work enhances fidelity of the NEC CPU emulation path and reduces mis-emulation across titles relying on these semantics.
1 Commits
Jul 1, 2026July 2026 Monthly Summary for mamedev/mame: Focused on correctness of NEC CPU emulation during division operations. Delivered a targeted bug fix to align carry and overflow flag behavior with observed hardware results, including proper handling of divide-by-zero and overflow conditions. Updated instruction dispatch and division macros to reflect NEC hardware semantics, reducing inconsistencies in division paths. This work enhances fidelity of the NEC CPU emulation path and reduces mis-emulation across titles relying on these semantics.
July 2026
June 2026
9 Commits • 6 Features
Jun 1, 2026June 2026 highlights across mamedev/mame focused on expanding hardware coverage, increasing emulation fidelity, and stabilizing core subsystems through architectural refactors and targeted bug fixes. Delivered working-state features for iconic arcade and home-consumer hardware, integrated new Akai samplers, and improved real-time behavior in DMA and interrupt handling. The month also deepened support for Akai S900/S950 and X7000 lineups with ROM/multi-BIOS and audio playback/sampling paths, while maintaining code quality through careful refactors and spec-compliant fixes.
June 2026
9 Commits • 6 Features
Jun 1, 2026June 2026 highlights across mamedev/mame focused on expanding hardware coverage, increasing emulation fidelity, and stabilizing core subsystems through architectural refactors and targeted bug fixes. Delivered working-state features for iconic arcade and home-consumer hardware, integrated new Akai samplers, and improved real-time behavior in DMA and interrupt handling. The month also deepened support for Akai S900/S950 and X7000 lineups with ROM/multi-BIOS and audio playback/sampling paths, while maintaining code quality through careful refactors and spec-compliant fixes.
May 2026
6 Commits • 4 Features
May 1, 2026May 2026 monthly summary for mamedev/mame highlighting key features delivered, major bug fixes, and resulting business value. Emphasis on tangible deliverables, hardware coverage expansion, and code health improvements that enable more accurate emulation milestones and easier future maintenance.
6 Commits • 4 Features
May 1, 2026May 2026 monthly summary for mamedev/mame highlighting key features delivered, major bug fixes, and resulting business value. Emphasis on tangible deliverables, hardware coverage expansion, and code health improvements that enable more accurate emulation milestones and easier future maintenance.
May 2026
April 2026
3 Commits • 1 Features
Apr 1, 2026April 2026 monthly summary for mamedev/mame focused on hardware emulation accuracy and stability improvements. Delivered key features for legacy printer interfaces and fixed critical I/O behavior to improve reliability of emulation.
April 2026
3 Commits • 1 Features
Apr 1, 2026April 2026 monthly summary for mamedev/mame focused on hardware emulation accuracy and stability improvements. Delivered key features for legacy printer interfaces and fixed critical I/O behavior to improve reliability of emulation.
March 2026
1 Commits • 1 Features
Mar 1, 2026March 2026 monthly summary for mamedev/mame. Focused on feature delivery for peripheral emulation. Delivered NEC PC-6022 Color Plotter Printer support, expanding hardware coverage and testability for print workflows. No major bugs fixed were documented this month. The work enhances the emulator’s value to developers and researchers by enabling accurate plotting device emulation and validating printer-related software pipelines.
1 Commits • 1 Features
Mar 1, 2026March 2026 monthly summary for mamedev/mame. Focused on feature delivery for peripheral emulation. Delivered NEC PC-6022 Color Plotter Printer support, expanding hardware coverage and testability for print workflows. No major bugs fixed were documented this month. The work enhances the emulator’s value to developers and researchers by enabling accurate plotting device emulation and validating printer-related software pipelines.
March 2026
January 2026
5 Commits • 5 Features
Jan 1, 2026January 2026: Delivered key hardware emulation features and core improvements across MAME (mamedev/mame), expanding device coverage, improving emulator accuracy, and enhancing developer tooling. Focused on Casio DG-10/DG-20 guitar support, uPD7801 core enhancements, ld50 MIDI/battery integration, Xetec C-5181 printer interface, and promoting Pirates of Dark Water to a working state. Implemented foundational ROM and debugger improvements to increase reliability and debugging efficiency.
January 2026
5 Commits • 5 Features
Jan 1, 2026January 2026: Delivered key hardware emulation features and core improvements across MAME (mamedev/mame), expanding device coverage, improving emulator accuracy, and enhancing developer tooling. Focused on Casio DG-10/DG-20 guitar support, uPD7801 core enhancements, ld50 MIDI/battery integration, Xetec C-5181 printer interface, and promoting Pirates of Dark Water to a working state. Implemented foundational ROM and debugger improvements to increase reliability and debugging efficiency.
September 2025
3 Commits • 1 Features
Sep 1, 2025In September 2025, delivered a focused feature to standardize and improve keyboard layout handling for Casio and Yamaha models in the MAME emulator, enhancing hit-testing accuracy and correct signal mapping. The work lays groundwork for scalable, model-specific input layouts and improves emulation fidelity for commonly used keyboard models.
3 Commits • 1 Features
Sep 1, 2025In September 2025, delivered a focused feature to standardize and improve keyboard layout handling for Casio and Yamaha models in the MAME emulator, enhancing hit-testing accuracy and correct signal mapping. The work lays groundwork for scalable, model-specific input layouts and improves emulation fidelity for commonly used keyboard models.
September 2025
July 2025
2 Commits • 1 Features
Jul 1, 2025Monthly performance summary for 2025-07 focused on delivering audio fidelity improvements and foundational emulation features for mamedev/mame. The month delivered stable CZ1 audio routing improvements and groundwork for Casio FZ-series sound emulation, enabling more accurate hardware emulation and smoother user experiences.
July 2025
2 Commits • 1 Features
Jul 1, 2025Monthly performance summary for 2025-07 focused on delivering audio fidelity improvements and foundational emulation features for mamedev/mame. The month delivered stable CZ1 audio routing improvements and groundwork for Casio FZ-series sound emulation, enabling more accurate hardware emulation and smoother user experiences.
June 2025
1 Commits • 1 Features
Jun 1, 2025June 2025 monthly summary focusing on key accomplishments in mamedev/mame. Implemented floppy disk support for Casio FZ-1 and clones, introducing a new FZ1_DSK image format and integrating a Panasonic JU-386 floppy drive into the FZ-1 machine configuration to enable floppy disk operations and improve emulation fidelity.
1 Commits • 1 Features
Jun 1, 2025June 2025 monthly summary focusing on key accomplishments in mamedev/mame. Implemented floppy disk support for Casio FZ-1 and clones, introducing a new FZ1_DSK image format and integrating a Panasonic JU-386 floppy drive into the FZ-1 machine configuration to enable floppy disk operations and improve emulation fidelity.
June 2025
April 2025
3 Commits • 3 Features
Apr 1, 2025April 2025 — mamedev/mame: Delivered baseline emulation scaffolding across three families to expand hardware coverage and enable future functionality. Skeleton Oldsmobile Driver Information System (version 2.2 CH) introduced with hardware configuration, IO ports, and memory maps to emulate core behavior; CPS-2000 emulation improvements include a skeleton driver plus enhanced μPD934 and MSM6200 emulation with timer-based MSM6200 scanning and a fix for the μPD934g play-sample command; preliminary drivers for Casio FZ-series samplers (FZ-1, FZ-10M, FZ-20M) with an internal V50 CPU serial interrupt and support for alternate HD44352 screen dimensions. All work is marked NOT_WORKING to reflect early-stage status but lays the groundwork for deeper emulation and testing. Commits align with #13525, #13591, #13623.
April 2025
3 Commits • 3 Features
Apr 1, 2025April 2025 — mamedev/mame: Delivered baseline emulation scaffolding across three families to expand hardware coverage and enable future functionality. Skeleton Oldsmobile Driver Information System (version 2.2 CH) introduced with hardware configuration, IO ports, and memory maps to emulate core behavior; CPS-2000 emulation improvements include a skeleton driver plus enhanced μPD934 and MSM6200 emulation with timer-based MSM6200 scanning and a fix for the μPD934g play-sample command; preliminary drivers for Casio FZ-series samplers (FZ-1, FZ-10M, FZ-20M) with an internal V50 CPU serial interrupt and support for alternate HD44352 screen dimensions. All work is marked NOT_WORKING to reflect early-stage status but lays the groundwork for deeper emulation and testing. Commits align with #13525, #13591, #13623.
March 2025
1 Commits
Mar 1, 2025March 2025 monthly summary for mamedev/mame focused on stabilizing the audio emulation path. Delivered a critical bug fix addressing a sound filter overflow in GT155 by widening the data-type range for the filter output in gt155.cpp and gt155.h, preventing data loss and improving reliability of audio processing in the emulated hardware. The change aligns with ongoing goals of improving fidelity and stability of audio emulation across GT155-based titles.
1 Commits
Mar 1, 2025March 2025 monthly summary for mamedev/mame focused on stabilizing the audio emulation path. Delivered a critical bug fix addressing a sound filter overflow in GT155 by widening the data-type range for the filter output in gt155.cpp and gt155.h, preventing data loss and improving reliability of audio processing in the emulated hardware. The change aligns with ongoing goals of improving fidelity and stability of audio emulation across GT155-based titles.
March 2025
February 2025
2 Commits • 1 Features
Feb 1, 2025February 2025 monthly summary for mamedev/mame focused on delivering key emulation features, stabilizing memory mappings, and expanding device coverage to support legacy hardware. The work drove improved fidelity, broader platform coverage, and reduced maintenance overhead for emulation paths.
February 2025
2 Commits • 1 Features
Feb 1, 2025February 2025 monthly summary for mamedev/mame focused on delivering key emulation features, stabilizing memory mappings, and expanding device coverage to support legacy hardware. The work drove improved fidelity, broader platform coverage, and reduced maintenance overhead for emulation paths.
January 2025
2 Commits • 2 Features
Jan 1, 2025January 2025 — mamedev/mame: Focused on expanding hardware support with two major feature sets and groundwork for ongoing emulation development. Key features delivered include AtGames Atari Flashback Portable (v4) system support and Casio Casiotone 8000 emulation. No explicit bug fixes documented in this dataset. Overall impact includes broader hardware coverage, improved entry points for future emulation fidelity, and demonstrable cross-domain integration (system configuration, audio synthesis, and MIDI).
2 Commits • 2 Features
Jan 1, 2025January 2025 — mamedev/mame: Focused on expanding hardware support with two major feature sets and groundwork for ongoing emulation development. Key features delivered include AtGames Atari Flashback Portable (v4) system support and Casio Casiotone 8000 emulation. No explicit bug fixes documented in this dataset. Overall impact includes broader hardware coverage, improved entry points for future emulation fidelity, and demonstrable cross-domain integration (system configuration, audio synthesis, and MIDI).
January 2025
Activity
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Quality Metrics
Correctness86.0%
Maintainability81.8%
Architecture82.0%
Performance77.0%
AI Usage30.2%
Skills & Technologies
Programming Languages
C++LuaXML
Technical Skills
Audio ProcessingAudio ProgrammingAudio SynthesisC++C++ DevelopmentC++ developmentC++ programmingCPU ArchitectureCPU EmulationCPU emulationConfiguration ManagementDevice DriversDigital Signal ProcessingDriver DevelopmentEmbedded Systems
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