mamedev/mame
Jun 2026 – Jul 2026
2 Months active
Languages Used
No languages
Technical Skills
Architecture RefactoringBitstream manipulationC++CPU ArchitectureCPU EmulationData serialization
David Rand
PROFILE
David Rand
Contributed to the mamedev/mame repository by developing and refining hardware emulation features, focusing on CPU and SCSI subsystems, disk controller architectures, and timing models. Leveraged C++ and Lua to implement modular frameworks for legacy systems such as Kaypro and Xerox, introducing enhancements like cylinder-aware seek-timing, target-mode SCSI state machines, and variable sector floppy support. Addressed concurrency and audio teardown issues to improve runtime stability and cross-platform reliability. The work emphasized architecture refactoring, low-level systems programming, and hardware reverse engineering, resulting in expanded hardware coverage, improved emulation fidelity, and more robust support for historical computing environments and testing workflows.
Overall Statistics
Feature vs Bugs
71%Features
Repository Contributions
46Total
Bugs
11
Commits
46
Features
27
Lines of code
13,244
Activity Months2
Your Network
119 peopleWork History
July 2026
10 Commits • 5 Features
Jul 1, 2026July 2026 highlights for mamedev/mame: Implemented major hardware emulation enhancements and stability fixes across multiple architectures, expanding capabilities for Kaypro, Xerox 820-II, NS32000, and SCSI/NCR5380 subsystems, while tightening build reliability and audio teardown. The work enhances fidelity of historical hardware emulation, broadens supported configurations, and reduces maintenance risk, delivering clear business value for testing, demonstration, and release readiness.
10 Commits • 5 Features
Jul 1, 2026July 2026 highlights for mamedev/mame: Implemented major hardware emulation enhancements and stability fixes across multiple architectures, expanding capabilities for Kaypro, Xerox 820-II, NS32000, and SCSI/NCR5380 subsystems, while tightening build reliability and audio teardown. The work enhances fidelity of historical hardware emulation, broadens supported configurations, and reduces maintenance risk, delivering clear business value for testing, demonstration, and release readiness.
July 2026
June 2026
36 Commits • 22 Features
Jun 1, 2026June 2026 delivered substantial improvements to core emulation, timing accuracy, and system coverage in the MAME project. Key features include disabling verbose WD1010 logging by default to improve runtime performance and log clarity; bringing the Xerox Big Board II driver closer to completeness with CP/M boot, SASI wiring, and automated “working” status; introducing cylinder-aware NSCSI seek-timing (s1410) with an opt-in API and integrating it into the hard-disk device to improve real-world timing accuracy across drive types; consolidating the seek-timing model into a common base to serve multiple controllers; implementing the Z80 I/O processor and SCSI subsystem (NatSemi ICM3216) to enable a cohesive host-IOP pathway and richer SCSI behavior. In addition, several high-impact bug fixes and reliability improvements were completed, including deasserting REQ between SCSI phases and holding BSY in COMMAND, faster and more reliable target selection, and enhancements to IMD/ floppy format support. Overall, these changes expand working hardware, improve emulation fidelity, and strengthen cross-platform portability and maintainability, with practical business value in enabling more accurate software runs, longer-term stability, and broader hardware coverage.
June 2026
36 Commits • 22 Features
Jun 1, 2026June 2026 delivered substantial improvements to core emulation, timing accuracy, and system coverage in the MAME project. Key features include disabling verbose WD1010 logging by default to improve runtime performance and log clarity; bringing the Xerox Big Board II driver closer to completeness with CP/M boot, SASI wiring, and automated “working” status; introducing cylinder-aware NSCSI seek-timing (s1410) with an opt-in API and integrating it into the hard-disk device to improve real-world timing accuracy across drive types; consolidating the seek-timing model into a common base to serve multiple controllers; implementing the Z80 I/O processor and SCSI subsystem (NatSemi ICM3216) to enable a cohesive host-IOP pathway and richer SCSI behavior. In addition, several high-impact bug fixes and reliability improvements were completed, including deasserting REQ between SCSI phases and holding BSY in COMMAND, faster and more reliable target selection, and enhancements to IMD/ floppy format support. Overall, these changes expand working hardware, improve emulation fidelity, and strengthen cross-platform portability and maintainability, with practical business value in enabling more accurate software runs, longer-term stability, and broader hardware coverage.
Activity
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Quality Metrics
Correctness100.0%
Maintainability87.8%
Architecture94.4%
Performance86.2%
AI Usage59.6%
Skills & Technologies
Programming Languages
No languages yet
Technical Skills
Architecture RefactoringAudio ProgrammingBitstream manipulationBus ProtocolsC++CPU ArchitectureCPU EmulationConcurrencyData serializationDisassemblyDriver DevelopmentEmbedded SystemsEmbedded Systems EmulationEmulationEmulation Development
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