mamedev/mame
Nov 2024 – Apr 2026
18 Months active
Languages Used
C++XMLLuaAssemblyCC#MakefilePython
Technical Skills
C++ DevelopmentConfiguration ManagementEmulationHardware SimulationReverse EngineeringTesting
holub
PROFILE
Holub
Andrei Holub developed and enhanced Sinclair and Spectrum emulation in the mamedev/mame repository over 18 months, delivering robust hardware fidelity and expanded device support. He engineered features such as DMA controller refactors, advanced Z80 CPU emulation, and accurate graphics rendering, using C++ and Assembly to optimize performance and maintainability. His work included integrating new hardware variants, improving interrupt handling, and supporting advanced debugging and scripting through Lua. By addressing low-level memory management, device drivers, and cross-platform build systems, Andrei consistently improved emulator stability, configurability, and user experience, demonstrating deep technical understanding and a methodical approach to complex system emulation.
Overall Statistics
Feature vs Bugs
69%Features
Repository Contributions
150Total
Bugs
30
Commits
150
Features
67
Lines of code
44,153
Activity Months18
Your Network
106 peopleWork History
April 2026
13 Commits • 5 Features
Apr 1, 2026April 2026: Implemented high-impact emulation enhancements and stability fixes across Sinclair/SpecNext. Key deliveries include DMA ZXN mode reliability fix, MIDI extension, randomized RAM at startup for realistic boot states, graphics/video stability improvements, and Anti-Brick core bootrom support with BIOS switching. These changes improve data integrity, interoperability with external workflows, startup realism, visual fidelity, and core-switching capabilities, collectively boosting user experience and maintainability.
13 Commits • 5 Features
Apr 1, 2026April 2026: Implemented high-impact emulation enhancements and stability fixes across Sinclair/SpecNext. Key deliveries include DMA ZXN mode reliability fix, MIDI extension, randomized RAM at startup for realistic boot states, graphics/video stability improvements, and Anti-Brick core bootrom support with BIOS switching. These changes improve data integrity, interoperability with external workflows, startup realism, visual fidelity, and core-switching capabilities, collectively boosting user experience and maintainability.
April 2026
March 2026
7 Commits • 2 Features
Mar 1, 2026March 2026 performance summary for mamedev/mame: Expanded hardware coverage, stabilized core emulation, and advanced SpecNext features that broaden compatibility and improve accuracy.
March 2026
7 Commits • 2 Features
Mar 1, 2026March 2026 performance summary for mamedev/mame: Expanded hardware coverage, stabilized core emulation, and advanced SpecNext features that broaden compatibility and improve accuracy.
February 2026
10 Commits • 4 Features
Feb 1, 2026February 2026 monthly summary for mamedev/mame focused on delivering high-value emulation improvements, robustness, and expanded software ecosystem. Key outcomes include enhanced Sinclair SpecNext emulation for better fidelity, performance and debugging enhancements to support stable long-running runs, and broader software format support. The work emphasizes business value through accurate hardware behavior, faster debugging cycles, and improved asset management.
10 Commits • 4 Features
Feb 1, 2026February 2026 monthly summary for mamedev/mame focused on delivering high-value emulation improvements, robustness, and expanded software ecosystem. Key outcomes include enhanced Sinclair SpecNext emulation for better fidelity, performance and debugging enhancements to support stable long-running runs, and broader software format support. The work emphasizes business value through accurate hardware behavior, faster debugging cycles, and improved asset management.
February 2026
January 2026
8 Commits • 1 Features
Jan 1, 2026January 2026 — MAME (mamedev/mame): Delivered Sinclair Emulator Enhancements and Stability Improvements with consolidated KS3 RAM expansion support, save-state enhancements (including raster offsets) and SPI SD card compatibility featuring configurable read/seek delays. Fixed critical Z80 IRQ handling from the daisy chain and improved NMI behavior in config mode. Extended Kempston input with vertical scrolling and performed configuration cleanup across drivers to reduce maintenance overhead. Layed groundwork for KS3 features (2 MiB RAM, SD swap bit) to enhance compatibility and user experience for Sinclair emulation. Overall, these efforts improved stability, compatibility, and performance, delivering clear business value through fewer regressions, smoother workflows for developers, and a better end-user experience.
January 2026
8 Commits • 1 Features
Jan 1, 2026January 2026 — MAME (mamedev/mame): Delivered Sinclair Emulator Enhancements and Stability Improvements with consolidated KS3 RAM expansion support, save-state enhancements (including raster offsets) and SPI SD card compatibility featuring configurable read/seek delays. Fixed critical Z80 IRQ handling from the daisy chain and improved NMI behavior in config mode. Extended Kempston input with vertical scrolling and performed configuration cleanup across drivers to reduce maintenance overhead. Layed groundwork for KS3 features (2 MiB RAM, SD swap bit) to enhance compatibility and user experience for Sinclair emulation. Overall, these efforts improved stability, compatibility, and performance, delivering clear business value through fewer regressions, smoother workflows for developers, and a better end-user experience.
December 2025
7 Commits • 4 Features
Dec 1, 2025December 2025 — Focused on stability, API clarity, and emulator fidelity across the MAME core. Delivered key scripting API improvements, robust interrupt handling, and enhanced SpecNext emulation, with a clear path for maintainability and future features.
7 Commits • 4 Features
Dec 1, 2025December 2025 — Focused on stability, API clarity, and emulator fidelity across the MAME core. Delivered key scripting API improvements, robust interrupt handling, and enhanced SpecNext emulation, with a clear path for maintainability and future features.
December 2025
November 2025
5 Commits • 1 Features
Nov 1, 2025November 2025 monthly summary focusing on Sinclair SpecNext emulator work in the mamedev/mame repository. The month delivered a cohesive set of features and stability fixes that improved graphics rendering, input handling, and media support for the SpecNext emulator, aligning with product quality goals and user expectations for accurate emulation.
November 2025
5 Commits • 1 Features
Nov 1, 2025November 2025 monthly summary focusing on Sinclair SpecNext emulator work in the mamedev/mame repository. The month delivered a cohesive set of features and stability fixes that improved graphics rendering, input handling, and media support for the SpecNext emulator, aligning with product quality goals and user expectations for accurate emulation.
October 2025
16 Commits • 5 Features
Oct 1, 2025Month 2025-10 (mamedev/mame): Focused on Spectrum Next fidelity, core stability, and developer tooling. Delivered rendering and display fixes for Timex Mode and SpecNext assets to ensure correct frame coherence and visual output; added prescaler-based DMA timing and clock/config improvements; hardened interrupt handling with IM2 integration and CTC cascading; introduced sprite collision reporting and refined layer2 overscan; expanded debugging capabilities and restructured programmer metadata for software lists. These changes increase emulation accuracy, reliability, and maintainability, enabling more faithful hardware reproduction and faster triage in future iterations.
16 Commits • 5 Features
Oct 1, 2025Month 2025-10 (mamedev/mame): Focused on Spectrum Next fidelity, core stability, and developer tooling. Delivered rendering and display fixes for Timex Mode and SpecNext assets to ensure correct frame coherence and visual output; added prescaler-based DMA timing and clock/config improvements; hardened interrupt handling with IM2 integration and CTC cascading; introduced sprite collision reporting and refined layer2 overscan; expanded debugging capabilities and restructured programmer metadata for software lists. These changes increase emulation accuracy, reliability, and maintainability, enabling more faithful hardware reproduction and faster triage in future iterations.
October 2025
September 2025
16 Commits • 8 Features
Sep 1, 2025September 2025: Delivered substantial emulation enhancements and stability improvements across mamedev/mame, expanding hardware coverage and fidelity while improving configurability and robustness. Notable work includes ZXBUS ISA integration, Copper-enabled tsconf2 FPGA variants, Spectrum Next video output with copper timing refinements, Sinclair ULA timing refactor, and Sprinter IO access improvements, plus robustness and metadata enhancements affecting software lists and cassette handling.
September 2025
16 Commits • 8 Features
Sep 1, 2025September 2025: Delivered substantial emulation enhancements and stability improvements across mamedev/mame, expanding hardware coverage and fidelity while improving configurability and robustness. Notable work includes ZXBUS ISA integration, Copper-enabled tsconf2 FPGA variants, Spectrum Next video output with copper timing refinements, Sinclair ULA timing refactor, and Sprinter IO access improvements, plus robustness and metadata enhancements affecting software lists and cassette handling.
August 2025
4 Commits • 3 Features
Aug 1, 20252025-08 Monthly Dev Summary for mamedev/mame: Delivered robust enhancements across audio routing, device timing, debugging, and clock validation. Focused on consistent emulation behavior, maintainable code structure, and improved developer workflow to strengthen reliability and scalability of the MAME project.
4 Commits • 3 Features
Aug 1, 20252025-08 Monthly Dev Summary for mamedev/mame: Delivered robust enhancements across audio routing, device timing, debugging, and clock validation. Focused on consistent emulation behavior, maintainable code structure, and improved developer workflow to strengthen reliability and scalability of the MAME project.
August 2025
July 2025
15 Commits • 11 Features
Jul 1, 2025July 2025: Expanded emulation fidelity and hardware coverage across Sinclair/Spectrum targets in MAME, with UI improvements and performance refinements that enhance usability and testing. Key features delivered and fixes implemented strengthen device coverage, timing accuracy, and developer workflow, delivering clearer business value for emulation accuracy and maintainability.
July 2025
15 Commits • 11 Features
Jul 1, 2025July 2025: Expanded emulation fidelity and hardware coverage across Sinclair/Spectrum targets in MAME, with UI improvements and performance refinements that enhance usability and testing. Key features delivered and fixes implemented strengthen device coverage, timing accuracy, and developer workflow, delivering clearer business value for emulation accuracy and maintainability.
June 2025
9 Commits • 6 Features
Jun 1, 2025June 2025: Focused on emulation accuracy, performance, and maintainability for mamedev/mame. Delivered a set of core feature enhancements, a major bug fix, and accessibility improvements, delivering tangible business value through more accurate emulation, faster TS-Conf timing, and a cleaner, more scalable codebase.
9 Commits • 6 Features
Jun 1, 2025June 2025: Focused on emulation accuracy, performance, and maintainability for mamedev/mame. Delivered a set of core feature enhancements, a major bug fix, and accessibility improvements, delivering tangible business value through more accurate emulation, faster TS-Conf timing, and a cleaner, more scalable codebase.
June 2025
May 2025
5 Commits • 1 Features
May 1, 2025May 2025: Strengthened core emulation reliability and security; delivered performance-oriented refactors to the Z80 CPU emulation core and upgraded the Expat XML parser to 2.7.1, with security and fuzzing improvements. These changes reduce risk, improve stability, and lay groundwork for future optimizations across the emulation stack.
May 2025
5 Commits • 1 Features
May 1, 2025May 2025: Strengthened core emulation reliability and security; delivered performance-oriented refactors to the Z80 CPU emulation core and upgraded the Expat XML parser to 2.7.1, with security and fuzzing improvements. These changes reduce risk, improve stability, and lay groundwork for future optimizations across the emulation stack.
April 2025
10 Commits • 4 Features
Apr 1, 2025April 2025 — Key business value delivered through substantive Z80 emulation improvements, expanded CPU support, and reliability enhancements across the emulation stack. The work solidifies accuracy for legacy cores, extends CPU coverage, strengthens memory mapping for Z84C015, and improves image handling and performance, benefiting end users with more compatible, faster, and reliable emulation.
10 Commits • 4 Features
Apr 1, 2025April 2025 — Key business value delivered through substantive Z80 emulation improvements, expanded CPU support, and reliability enhancements across the emulation stack. The work solidifies accuracy for legacy cores, extends CPU coverage, strengthens memory mapping for Z84C015, and improves image handling and performance, benefiting end users with more compatible, faster, and reliable emulation.
April 2025
March 2025
6 Commits • 2 Features
Mar 1, 2025March 2025 performance and stability improvements for mamedev/mame. Delivered two key features: Spectrum emulation performance optimization by removing memory region lookups in the critical ROM access path, yielding ~50% speedup; and a memory access refactor to a base driver for Sinclair files, improving code organization and maintainability. Major bug fixes enhanced stability and cross-platform support: reordering initialization of onboard media devices before slots to stabilize media options; refined Z80 debugger stepping for block transfer instructions by switching to STEP_OVER; and macOS build compatibility by dynamically linking against Qt5 or Qt6 to ensure successful builds. In addition, the Zlib 1.3.1 upgrade with ARM64 support was applied to improve build stability and platform coverage. Overall impact: faster core emulation, more robust media options, smoother debugging workflows, and broader platform compatibility, contributing to quicker and more reliable releases. Technologies/skills demonstrated: advanced C++ optimizations, refactoring for maintainability, cross-platform and build system integration, and ARM64-aware development.
March 2025
6 Commits • 2 Features
Mar 1, 2025March 2025 performance and stability improvements for mamedev/mame. Delivered two key features: Spectrum emulation performance optimization by removing memory region lookups in the critical ROM access path, yielding ~50% speedup; and a memory access refactor to a base driver for Sinclair files, improving code organization and maintainability. Major bug fixes enhanced stability and cross-platform support: reordering initialization of onboard media devices before slots to stabilize media options; refined Z80 debugger stepping for block transfer instructions by switching to STEP_OVER; and macOS build compatibility by dynamically linking against Qt5 or Qt6 to ensure successful builds. In addition, the Zlib 1.3.1 upgrade with ARM64 support was applied to improve build stability and platform coverage. Overall impact: faster core emulation, more robust media options, smoother debugging workflows, and broader platform compatibility, contributing to quicker and more reliable releases. Technologies/skills demonstrated: advanced C++ optimizations, refactoring for maintainability, cross-platform and build system integration, and ARM64-aware development.
February 2025
3 Commits • 1 Features
Feb 1, 2025February 2025 monthly summary for mamedev/mame focusing on stability, data integrity, and emulator reliability. Key work centered on Sprinter improvements and TAP parsing robustness, delivering tangible improvements to user experience and data correctness.
3 Commits • 1 Features
Feb 1, 2025February 2025 monthly summary for mamedev/mame focusing on stability, data integrity, and emulator reliability. Key work centered on Sprinter improvements and TAP parsing robustness, delivering tangible improvements to user experience and data correctness.
February 2025
January 2025
8 Commits • 3 Features
Jan 1, 2025January 2025: Delivered core reliability and compatibility improvements for mamedev/mame with a focus on hardware state management, bus architecture, expanded BIOS/ProfROM coverage, and safer cassette handling. These changes enhance user confidence, broaden hardware support, and reduce risk for future feature work.
January 2025
8 Commits • 3 Features
Jan 1, 2025January 2025: Delivered core reliability and compatibility improvements for mamedev/mame with a focus on hardware state management, bus architecture, expanded BIOS/ProfROM coverage, and safer cassette handling. These changes enhance user confidence, broaden hardware support, and reduce risk for future feature work.
December 2024
6 Commits • 4 Features
Dec 1, 2024December 2024 development cycle focused on reliability, expanded hardware emulation coverage, and improved debugging workflows for mamedev/mame. The month delivered a set of high-value features, targeted stability fixes, and improvements that reduce startup errors, broaden hardware compatibility, and enable richer user experiences through save states and advanced decoding.
6 Commits • 4 Features
Dec 1, 2024December 2024 development cycle focused on reliability, expanded hardware emulation coverage, and improved debugging workflows for mamedev/mame. The month delivered a set of high-value features, targeted stability fixes, and improvements that reduce startup errors, broaden hardware compatibility, and enable richer user experiences through save states and advanced decoding.
December 2024
November 2024
2 Commits • 2 Features
Nov 1, 2024Monthly summary for 2024-11: Key feature delivery in mamedev/mame focused on validation-driven improvements and emulation enhancements. Emphasis on reliability and hardware accuracy through QA-driven item confirmations and targeted emulation refactor.
November 2024
2 Commits • 2 Features
Nov 1, 2024Monthly summary for 2024-11: Key feature delivery in mamedev/mame focused on validation-driven improvements and emulation enhancements. Emphasis on reliability and hardware accuracy through QA-driven item confirmations and targeted emulation refactor.
Activity
Loading activity data...
Quality Metrics
Correctness89.0%
Maintainability86.2%
Architecture84.6%
Performance81.4%
AI Usage20.6%
Skills & Technologies
Programming Languages
AssemblyCC#C++CMakeLuaMakefilePythonRSTShell
Technical Skills
Assembly LanguageAssembly Language OptimizationAudio Hardware ConfigurationBIOS IntegrationBIOS UpdatesBit manipulationBug FixingBuild System ConfigurationBuild SystemsBuild system integrationBus ArchitectureC programmingC++C++ DevelopmentC++ development
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline