mamedev/mame
Aug 2025 – Apr 2026
2 Months active
Languages Used
C++
Technical Skills
Color Palette ManagementEmulator DevelopmentC++ programmingembedded systemsfirmware development
ValleyBell
PROFILE
Valleybell
Valley Bell contributed to the mamedev/mame repository by refining the KC-85 emulator’s color palette, improving color accuracy and vibrancy to better match original hardware output. Using C++ and expertise in color palette management, Valley Bell adjusted RGB values to address fidelity issues, enhancing the realism of KC-85 rendering. Additionally, Valley Bell fixed a bug in Roland PCM card support by correcting address line scrambling, ensuring consistent ROM configuration and more reliable PCM data handling. This work demonstrated skills in embedded systems and low-level debugging, resulting in more stable emulation and reduced user-reported issues related to PCM ROM dumps.
Overall Statistics
Feature vs Bugs
50%Features
Repository Contributions
2Total
Bugs
1
Commits
2
Features
1
Lines of code
256
Activity Months2
Your Network
106 peopleWork History
April 2026
1 Commits
Apr 1, 2026April 2026: Key reliability improvement in Roland PCM card support for mamedev/mame via address line scrambling fix. The fix aligns ROM configuration across CM-32P internal PCM ROMs and PCM addon cards, addressing previously reversed address lines and improving PCM data handling reliability. Impact: more stable emulation and reduced user-reported issues related to PCM ROM dumps. Skills demonstrated include low-level emulation debugging, bitwise ROM addressing, and patch quality with clear commit history (commit a855cb1b62ddc07839aa5da0e5f4432f5c981e49).
1 Commits
Apr 1, 2026April 2026: Key reliability improvement in Roland PCM card support for mamedev/mame via address line scrambling fix. The fix aligns ROM configuration across CM-32P internal PCM ROMs and PCM addon cards, addressing previously reversed address lines and improving PCM data handling reliability. Impact: more stable emulation and reduced user-reported issues related to PCM ROM dumps. Skills demonstrated include low-level emulation debugging, bitwise ROM addressing, and patch quality with clear commit history (commit a855cb1b62ddc07839aa5da0e5f4432f5c981e49).
April 2026
August 2025
1 Commits • 1 Features
Aug 1, 2025August 2025 focused on visual fidelity improvements for KC-85 in the mamedev/mame repository. Delivered KC-85 Color Palette Refinement to improve color accuracy and vibrancy, addressing palette-related fidelity issues and aligning with the original hardware colors. This work enhances emulation realism, reduces color drift, and contributes to a more faithful user experience along with robust maintenance of visual fidelity across KC-85 rendering.
August 2025
1 Commits • 1 Features
Aug 1, 2025August 2025 focused on visual fidelity improvements for KC-85 in the mamedev/mame repository. Delivered KC-85 Color Palette Refinement to improve color accuracy and vibrancy, addressing palette-related fidelity issues and aligning with the original hardware colors. This work enhances emulation realism, reduces color drift, and contributes to a more faithful user experience along with robust maintenance of visual fidelity across KC-85 rendering.
Activity
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Quality Metrics
Correctness90.0%
Maintainability90.0%
Architecture80.0%
Performance90.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
C++
Technical Skills
C++ programmingColor Palette ManagementEmulator Developmentembedded systemsfirmware development
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