mamedev/mame
Jan 2025 – Jun 2026
7 Months active
Languages Used
C++
Technical Skills
Color Palette ManagementDevice ConfigurationEmbedded SystemsEmulationEmulator DevelopmentVideo Hardware Emulation
Fabio D'Urso
PROFILE
Fabio D'urso
Contributed to the mamedev/mame repository by developing and refining hardware emulation features, focusing on video and audio device fidelity for legacy systems such as the Minitel 2 and EF9345/TS9347 video chips. Leveraged C++ and low-level programming to implement accurate rendering, device driver enhancements, and digital signal processing for modem audio output. Addressed edge-case bugs in RAM handling and device timing, introduced robust attribute and palette management, and improved testing workflows with flexible ROM slot support. Emphasis was placed on maintainable, traceable code, with careful refactoring to support hardware variants and ensure regression readiness across embedded systems and emulation targets.
Overall Statistics
Feature vs Bugs
78%Features
Repository Contributions
16Total
Bugs
2
Commits
16
Features
7
Lines of code
737
Activity Months7
Your Network
119 peopleWork History
June 2026
1 Commits • 1 Features
Jun 1, 2026June 2026 monthly summary for mamedev/mame: Delivered a substantial audio emulation feature for the Minitel 2 emulator by implementing sound output that emulates the TS7514 modem chip's audio generation, enabling DTMF tones and system beeps via a real-time sound stream driven by modem register states. The work includes a targeted subset of modem capabilities to produce authentic sounds suitable for the demov1 ROM and the original ROMs. It covers mode selection, input control via a shift register (RTS/PRD), DTMF mode via RDTMF, speaker output control via RWLO, and frequency filtering via RPTF. The feature also implements beep generation on invalid keypress and simplifies carrier-detect signaling when the line control relay is closed, improving stability. The change is validated against the demov1/original ROM sound playback and is traceable to commit 580c647ea2cd430463c62ce5081018159bcbce5c.
1 Commits • 1 Features
Jun 1, 2026June 2026 monthly summary for mamedev/mame: Delivered a substantial audio emulation feature for the Minitel 2 emulator by implementing sound output that emulates the TS7514 modem chip's audio generation, enabling DTMF tones and system beeps via a real-time sound stream driven by modem register states. The work includes a targeted subset of modem capabilities to produce authentic sounds suitable for the demov1 ROM and the original ROMs. It covers mode selection, input control via a shift register (RTS/PRD), DTMF mode via RDTMF, speaker output control via RWLO, and frequency filtering via RPTF. The feature also implements beep generation on invalid keypress and simplifies carrier-detect signaling when the line control relay is closed, improving stability. The change is validated against the demov1/original ROM sound playback and is traceable to commit 580c647ea2cd430463c62ce5081018159bcbce5c.
June 2026
December 2025
1 Commits • 1 Features
Dec 1, 2025December 2025 monthly summary for mamedev/mame focusing on feature delivery and testing workflow improvements in the Minitel 2 variant. The main accomplishment was enhancing the ROM listing and testing capabilities for Minitel 2 to support broader test coverage and faster validation.
December 2025
1 Commits • 1 Features
Dec 1, 2025December 2025 monthly summary for mamedev/mame focusing on feature delivery and testing workflow improvements in the Minitel 2 variant. The main accomplishment was enhancing the ROM listing and testing capabilities for Minitel 2 to support broader test coverage and faster validation.
October 2025
8 Commits • 1 Features
Oct 1, 2025October 2025 monthly summary focusing on key accomplishments in MAME development: addressed correctness in RAM writes for the MCS-51 family and AXC51, and delivered comprehensive EF9345/TS9347 video device emulation improvements. Fixes and enhancements increased emulation fidelity, reduced edge-case errors in RAM management, and strengthened cross-chip compatibility. Architectural refinements now enable cleaner variant support via virtual functions, improving maintainability and enabling future expansions.
8 Commits • 1 Features
Oct 1, 2025October 2025 monthly summary focusing on key accomplishments in MAME development: addressed correctness in RAM writes for the MCS-51 family and AXC51, and delivered comprehensive EF9345/TS9347 video device emulation improvements. Fixes and enhancements increased emulation fidelity, reduced edge-case errors in RAM management, and strengthened cross-chip compatibility. Architectural refinements now enable cleaner variant support via virtual functions, improving maintainability and enabling future expansions.
October 2025
September 2025
1 Commits
Sep 1, 2025September 2025 (mamedev/mame): Focused on stabilizing the Video Device timing with respect to scanline generation. Implemented a bug fix for BUSY flag handling that ensures the BUSY flag remains asserted for relevant commands and the busy timer is adjusted when a running command is interrupted. This improves timing accuracy, device state management, and overall emulation reliability. The change aligns with issue #14081 and includes the patch committed as 75cd361c76bfbd0aaec011464a3e64e5e08df309 with message ef9345: scanline generation should not assert/deassert the BUSY flag.
September 2025
1 Commits
Sep 1, 2025September 2025 (mamedev/mame): Focused on stabilizing the Video Device timing with respect to scanline generation. Implemented a bug fix for BUSY flag handling that ensures the BUSY flag remains asserted for relevant commands and the busy timer is adjusted when a running command is interrupted. This improves timing accuracy, device state management, and overall emulation reliability. The change aligns with issue #14081 and includes the patch committed as 75cd361c76bfbd0aaec011464a3e64e5e08df309 with message ef9345: scanline generation should not assert/deassert the BUSY flag.
June 2025
1 Commits • 1 Features
Jun 1, 2025June 2025 focused on targeted enhancements to the EF9345 video device within mamedev/mame, delivering a precise improvement in rendering fidelity for insert and cursor behavior. The work included refactoring the rendering path, introducing a robust makecolors function for attribute application, and implementing a phase-based blinking system for more reliable character and cursor flashing.
1 Commits • 1 Features
Jun 1, 2025June 2025 focused on targeted enhancements to the EF9345 video device within mamedev/mame, delivering a precise improvement in rendering fidelity for insert and cursor behavior. The work included refactoring the rendering path, introducing a robust makecolors function for attribute application, and implementing a phase-based blinking system for more reliable character and cursor flashing.
June 2025
April 2025
1 Commits • 1 Features
Apr 1, 2025April 2025 monthly summary for mamedev/mame: Delivered targeted improvements to EF9345 emulation by refactoring the zoom function to faithfully reproduce double-height scaling and by adjusting scanline repetition logic. These changes reduce hardware-accurate discrepancies (first scanline repeated three times, last only once) and align emulation more closely with the real chip, enhancing fidelity for titles depending on EF9345 behavior. The work is tracked in commit 7522a39dc29ccba5e4037d17ecbec7737cafd5f3 (#13629).
April 2025
1 Commits • 1 Features
Apr 1, 2025April 2025 monthly summary for mamedev/mame: Delivered targeted improvements to EF9345 emulation by refactoring the zoom function to faithfully reproduce double-height scaling and by adjusting scanline repetition logic. These changes reduce hardware-accurate discrepancies (first scanline repeated three times, last only once) and align emulation more closely with the real chip, enhancing fidelity for titles depending on EF9345 behavior. The work is tracked in commit 7522a39dc29ccba5e4037d17ecbec7737cafd5f3 (#13629).
January 2025
3 Commits • 2 Features
Jan 1, 2025January 2025 monthly summary for mamedev/mame: Key features delivered include enhancements to the Minitel 2 Emulator and the TS9347 variant UI, improving emulation fidelity and user visibility. Major fixes focused on serial port accuracy and color palette clarity, along with a UI data presentation improvement for the TS9347 variant. Overall impact: higher fidelity emulation of Minitel hardware, clearer visual differentiation of color palettes, and more reliable service/status data presentation at the top of the UI. Technologies and skills demonstrated: device-level emulation changes in C++ code, palette management, conditional data fetching, and commit-level traceability with focused, reviewable changes.
3 Commits • 2 Features
Jan 1, 2025January 2025 monthly summary for mamedev/mame: Key features delivered include enhancements to the Minitel 2 Emulator and the TS9347 variant UI, improving emulation fidelity and user visibility. Major fixes focused on serial port accuracy and color palette clarity, along with a UI data presentation improvement for the TS9347 variant. Overall impact: higher fidelity emulation of Minitel hardware, clearer visual differentiation of color palettes, and more reliable service/status data presentation at the top of the UI. Technologies and skills demonstrated: device-level emulation changes in C++ code, palette management, conditional data fetching, and commit-level traceability with focused, reviewable changes.
January 2025
Activity
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Quality Metrics
Correctness93.2%
Maintainability86.2%
Architecture87.4%
Performance82.6%
AI Usage22.6%
Skills & Technologies
Programming Languages
C++
Technical Skills
Assembly LanguageC++C++ DevelopmentC++ programmingCPU EmulationColor Palette ManagementDevice ConfigurationDevice Driver DevelopmentDevice DriversDevice EmulationDigital Signal ProcessingEmbedded SystemsEmulationEmulator DevelopmentGraphics rendering
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