86Box/86Box
Nov 2024 – Apr 2026
18 Months active
Languages Used
CC++JavaScriptMakefilePOPythonShellAssembly
Technical Skills
Bug FixBug FixingBuild SystemBuild SystemsC ProgrammingC programming
Miran Grča
PROFILE
Miran Grča
Over an 18-month period, contributed extensively to the 86Box/86Box repository, building and refining a cross-platform PC emulator with a focus on hardware fidelity, performance, and user experience. Leveraging C, C++, and Qt, delivered over 300 features and fixed more than 600 bugs, addressing core emulation, device drivers, and UI/UX. Work included architectural upgrades such as dynamic recompilers, expanded hardware and peripheral support, and robust localization. Emphasized maintainability through code refactoring, configuration management, and CI/CD improvements. Enhanced graphics rendering, memory management, and input handling, resulting in a stable, accessible emulator that supports a wide range of legacy systems.
Overall Statistics
Feature vs Bugs
33%Features
Repository Contributions
1,370Total
Bugs
639
Commits
1,370
Features
321
Lines of code
3,144,430
Activity Months18
Your Network
82 peopleWork History
April 2026
71 Commits • 11 Features
Apr 1, 2026April 2026 (2026-04) monthly summary for 86Box/86Box. Focused on delivering UI/UX and stability improvements with business value in mind, while expanding localization and maintainability. Key changes spanned UI/name normalization, configuration management, hardware emulation refinements, and persistence enhancements across the project.
71 Commits • 11 Features
Apr 1, 2026April 2026 (2026-04) monthly summary for 86Box/86Box. Focused on delivering UI/UX and stability improvements with business value in mind, while expanding localization and maintainability. Key changes spanned UI/name normalization, configuration management, hardware emulation refinements, and persistence enhancements across the project.
April 2026
March 2026
149 Commits • 46 Features
Mar 1, 2026March 2026 summary for 86Box/86Box: Delivered core PnP and hardware support, expanded NIC compatibility, and refined the UI/settings experience, alongside stability and maintainability improvements. Implemented ES0968 PnP support with real PnP ROM usage for ES688/ES1688 paths and added PC7311/12/32 ID readout on reset. Brought SMC Epic 100 / EtherPower II NIC support online. Overhauled the Settings dialog with a tabbed interface in preparation for a broader Preferences rewrite. Prepared device config migration paths for smoother upgrades and advanced memory allocation robustness through calloc-based initialization. Improved localization coverage via Weblate updates and a range of UI and integration enhancements across the codebase.
March 2026
149 Commits • 46 Features
Mar 1, 2026March 2026 summary for 86Box/86Box: Delivered core PnP and hardware support, expanded NIC compatibility, and refined the UI/settings experience, alongside stability and maintainability improvements. Implemented ES0968 PnP support with real PnP ROM usage for ES688/ES1688 paths and added PC7311/12/32 ID readout on reset. Brought SMC Epic 100 / EtherPower II NIC support online. Overhauled the Settings dialog with a tabbed interface in preparation for a broader Preferences rewrite. Prepared device config migration paths for smoother upgrades and advanced memory allocation robustness through calloc-based initialization. Improved localization coverage via Weblate updates and a range of UI and integration enhancements across the codebase.
February 2026
52 Commits • 9 Features
Feb 1, 2026February 2026 delivered meaningful business value by expanding hardware emulation coverage, improving accessibility and UI polish, and hardening configuration and resource handling. Notable features include HDD audio profiles initialized at startup and ADD-X Normerel Xenon support, color-accessible activity indicators, and enhanced VM configuration path handling and icon assets. These changes improve startup stability, cross-platform compatibility, and long-term maintainability, while reducing user-visible issues.
52 Commits • 9 Features
Feb 1, 2026February 2026 delivered meaningful business value by expanding hardware emulation coverage, improving accessibility and UI polish, and hardening configuration and resource handling. Notable features include HDD audio profiles initialized at startup and ADD-X Normerel Xenon support, color-accessible activity indicators, and enhanced VM configuration path handling and icon assets. These changes improve startup stability, cross-platform compatibility, and long-term maintainability, while reducing user-visible issues.
February 2026
January 2026
84 Commits • 30 Features
Jan 1, 2026January 2026 focused on delivering practical improvements that increase usability, reliability, and release readiness for 86Box. Key work included major documentation updates, UI cleanup, targeted refactors to improve maintainability, and foundational MDS/nvr and hardware support groundwork. Cross-platform stability enhancements and CI improvements set the stage for the upcoming 6.0 release and broader deployment.
January 2026
84 Commits • 30 Features
Jan 1, 2026January 2026 focused on delivering practical improvements that increase usability, reliability, and release readiness for 86Box. Key work included major documentation updates, UI cleanup, targeted refactors to improve maintainability, and foundational MDS/nvr and hardware support groundwork. Cross-platform stability enhancements and CI improvements set the stage for the upcoming 6.0 release and broader deployment.
December 2025
55 Commits • 14 Features
Dec 1, 2025December 2025 (Month: 2025-12) — Delivered a comprehensive mix of release readiness, UX improvements, GPU/graphics backend enhancements, and stability fixes for 86Box/86Box. Focused on business value through stability, performance, and cross-platform reliability, while enabling faster future development with refactors and UI improvements.
55 Commits • 14 Features
Dec 1, 2025December 2025 (Month: 2025-12) — Delivered a comprehensive mix of release readiness, UX improvements, GPU/graphics backend enhancements, and stability fixes for 86Box/86Box. Focused on business value through stability, performance, and cross-platform reliability, while enabling faster future development with refactors and UI improvements.
December 2025
November 2025
2 Commits • 1 Features
Nov 1, 20252025-11 monthly summary for 86Box/86Box focusing on user-facing metrics improvements and rendering reliability. Delivered concise performance metric display and fixed a critical bit-shift bug in Tandy video rendering, enhancing usability, reliability, and overall product quality.
November 2025
2 Commits • 1 Features
Nov 1, 20252025-11 monthly summary for 86Box/86Box focusing on user-facing metrics improvements and rendering reliability. Delivered concise performance metric display and fixed a critical bit-shift bug in Tandy video rendering, enhancing usability, reliability, and overall product quality.
October 2025
33 Commits • 8 Features
Oct 1, 2025In October 2025, the 86Box project delivered significant hardware- and renderer-focused enhancements, along with targeted bug fixes that improved stability, accuracy, and performance across emulated systems. The work enhances compatibility with a wider range of guest configurations and strengthens the project’s ability to reproduce authentic hardware behavior while reducing noise from warnings and layout issues.
33 Commits • 8 Features
Oct 1, 2025In October 2025, the 86Box project delivered significant hardware- and renderer-focused enhancements, along with targeted bug fixes that improved stability, accuracy, and performance across emulated systems. The work enhances compatibility with a wider range of guest configurations and strengthens the project’s ability to reproduce authentic hardware behavior while reducing noise from warnings and layout issues.
October 2025
September 2025
74 Commits • 18 Features
Sep 1, 2025September 2025 performance summary for 86Box/86Box focusing on delivering core platform improvements, stability, and measurable business value across legacy I/O paths and hardware emulation. Highlights include reorganization and hygiene improvements, performance tuning, and UX enhancements that reduce noise and improve user experience for long-running simulations and hardware compatibility. Key deliverables and outcomes include: - EDID Parser relocation to utils/ with a warning fix to improve code maintainability and reuse across modules. - LPT: Implemented ECP FIFO test mode and fixed printing in ECP mode on the ASUS P/I-P55T2P4, improving reliability of parallel-port emulation. - 386DX performance and stability: Enabled external cache to boost throughput; tuned cache defaults and wait-state handling to effectively zero wait states, resulting in smoother emulation on CPU-bound scenarios. - Config UX enhancement: Remember and restore fullscreen state when window size/position is saved, improving session continuity for users. - SCSI UI/I/O improvement: Extended dynamic SCSI buffer window sizing fix to MO, removable disk, and CD-ROM, reducing edge-case IO latency and improving overall device compatibility. Overall impact and accomplishments: - Strengthened hardware compatibility and stability across a broad set of legacy devices (LPT, SCSI, IDE, NIC emulation), reducing user-reported issues and enhancing confidence in long-running sessions. - Notable performance uplift through 386DX external cache and refined wait-state logic, enabling smoother operation in CPU-intensive workloads. - Cleaner codebase and improved developer experience via CLang warning fixes and modular EDID relocation, supporting faster future changes. Technologies and skills demonstrated: - Low-level systems programming (C/C++), hardware emulation, and I/O port handling. - Performance optimization (external cache, wait-state tuning) and memory management. - Build quality and cross-platform considerations (CLang warnings, Qt renderer hints) and codebase modernization (utils/ refactor for EDID parsing).
September 2025
74 Commits • 18 Features
Sep 1, 2025September 2025 performance summary for 86Box/86Box focusing on delivering core platform improvements, stability, and measurable business value across legacy I/O paths and hardware emulation. Highlights include reorganization and hygiene improvements, performance tuning, and UX enhancements that reduce noise and improve user experience for long-running simulations and hardware compatibility. Key deliverables and outcomes include: - EDID Parser relocation to utils/ with a warning fix to improve code maintainability and reuse across modules. - LPT: Implemented ECP FIFO test mode and fixed printing in ECP mode on the ASUS P/I-P55T2P4, improving reliability of parallel-port emulation. - 386DX performance and stability: Enabled external cache to boost throughput; tuned cache defaults and wait-state handling to effectively zero wait states, resulting in smoother emulation on CPU-bound scenarios. - Config UX enhancement: Remember and restore fullscreen state when window size/position is saved, improving session continuity for users. - SCSI UI/I/O improvement: Extended dynamic SCSI buffer window sizing fix to MO, removable disk, and CD-ROM, reducing edge-case IO latency and improving overall device compatibility. Overall impact and accomplishments: - Strengthened hardware compatibility and stability across a broad set of legacy devices (LPT, SCSI, IDE, NIC emulation), reducing user-reported issues and enhancing confidence in long-running sessions. - Notable performance uplift through 386DX external cache and refined wait-state logic, enabling smoother operation in CPU-intensive workloads. - Cleaner codebase and improved developer experience via CLang warning fixes and modular EDID relocation, supporting faster future changes. Technologies and skills demonstrated: - Low-level systems programming (C/C++), hardware emulation, and I/O port handling. - Performance optimization (external cache, wait-state tuning) and memory management. - Build quality and cross-platform considerations (CLang warnings, Qt renderer hints) and codebase modernization (utils/ refactor for EDID parsing).
August 2025
178 Commits • 47 Features
Aug 1, 2025August 2025 monthly summary for 86Box/86Box: Key features delivered - IDE initialization improvements and CMD-64x option ROM support, with CMD-648 option ROM support added. Commit highlights: a16f28fab5ce72dbf67c97ea8911aab817df4a8a; 33af41683643ab54090c26b65f751f5afdb00242. - Machine table overhaul and internal reorganization enabling more robust machine handling and KBC integration; added support for FIC PO-6000. Related work includes the great internal machine reorganization and machine_table.c changes, plus initial/second rounds of machine updates. Commits showcase: d2c8dab3427730f3e9669c1360378be8c51fcda9; 4b851ad0bb29fa9fa81ee674343bd7948f055977; 6de179581d1e85ed245c4ec42501ae06ef58de6e. - FDC37x family fixes and ECP/EPP integration enabling richer disk controller emulation and stability. Key commits: 633308be28cbf23e9c3e2cd810146f8d9cd5ad35; 87c37650716ce7975f07ffc43ce4e646a2bfccaf; c0d9d6aef927b7eb680a40eaae4c17a5ad8a3bcd; 711e09e08b99f8ae4f53f1e6ebb1a14400e7e7c8. - LPT ports migrated to device_t representations, simplifying port management and improving compatibility across machines. Commit: b9e294b781b1db4023bb9f32eba025f58ca060a7. - CD-ROM and CD-ROM image reliability improvements, including CRC/ECC handling refinements, multi-session cue sheet handling fixes, and image loading improvements. Notable commits: 411c239771a4b9299ff5ce1dbbcd27429320912d; 9a25de86b31808cfbd1678b8635dbafc5e951e36; ce9c40e058e36337a0ef3874e1d8a17766593f60; a1b0d535e13d7fbc69f73b5d81d41ded0d08f2d9; bf61d75056604c6c47b160856d3140d34b2ee79f; de00b76668babd6ce70f41672a02d3792a21b7ec; 7b624bb6a635ac3caa921fd6461cdf991da79bce; 8ea2d12dca93ec7617298526d2f60caec4ffd84f. - Localization and translations improvements across Slovenian, Portuguese, Spanish, Czech, Slovak, Korean, Traditional Chinese, Simplified Chinese, Norwegian, Dutch, Croatian, Italian, Japanese, Ukrainian, Russian, French, Swedish and more; string updates and true color support added. Representative commits: 2cc61b6a5933b79107a77df825a9483e5cdf17c4; 8806b8ca45d09c81a29482e466f19f98eeee3b5a; 93d3e4a3ab9cff9d50bc72b1cc33d4307affe3ea; 9d09e3dbaf8050d13a8d43b3fed0942202333b84; multiple others. - Release readiness: Version bumped to 5.0.1 and global config rename completed to 86box_global.cfg, aligning packaging and defaults. Notable commits: 75049ae6288b4710a00240d711034ba901910a09; 1670ae1cfa43fb74f00ac5bc6aba96fd0d868456. Major bugs fixed - VGA render: addressed out-of-bounds writes, reducing crash risk and improving render stability. Commit: 5164ce9c82332284a919e0205c0cf07477519c0a. - MKE CD-ROM: corrected 8-bit ISA width; resolved potential hardware emulation mismatch. Commit: 0d093330f47fda4def45b54cdf42446a4fd79cdd. - Hard disk controller settings: now actually uses instantiated configuration settings, improving realism and reliability. Commit: 3e800db1245a2a7d0f1b190a04d083177131e8e6. - Misc header and header-related fixes: restored missing cdrom.h reference, fixed stray pre-device_t leftovers, and corrected various compilation and initialization issues across subsystems. Commits: a828626177f55c101ce35d1bf85258cf508c27be; 442c029facf70c5c752e5914ae41f7f0c7177af6; e415e23404e8d92dc900affe1ec24e9032e7fedd; 9842ef63465ba24d6d5c800597ce0b2887e18847. - Logging, UI and stability improvements: cleaned up excess logging, improved help text safety, and reduced noise in the UI and logs; addressed segmentation fault risks in help prints and VM/UI related warnings. Representative commits: 0da985dd9313c7bb5f65484595569767b5c91f8d; f9865b159a1f7dcb8967f307dafc411053b17b82; 5d5913ac278cf2acf4e081ebab53de6b91746144; 324e1480ef9de8dd81b64905a2a7b6d11d97091a; 8eefb0fe95940c16fbea0af8398e399577a46de6. - Stability fixes for VM Manager, SCSI/UI readability, and platform-specific warnings; including fixes to CLang warnings and specific machine drivers. Representative commits: 413bf3dbe8168dd3525fdb2d742c31a69c9e6fe7; a0f6644e0065b0ac4b7cbf549291ca941acb9fba; c2c964199230a324f0c3e9e41f616378b5534672; d7a714185c202c7fe2093c15240bfd772384247e. - Release hygiene: improved configuration loading, saving and remapping capabilities for long-term maintainability. Commits: c3fae26ec7253e1deb859ad089164c2f277aa341; 50cf7330a31bd84be28410f8bb023883d3ae59d1. Overall impact and accomplishments - Substantial expansion of hardware compatibility and fidelity with new machines and refined device models, enabling more accurate and richer emulation for a broader user base. - Improved stability, especially in critical paths (CD-ROM, VGA rendering, LPT/DMA/keyboard controllers), reducing crash reporters and user-reported issues. - Architectural enhancements (device_t migration, machine_table refactor, KBC unification) that reduce technical debt and simplify future feature work. - Internationalization and localization improvements, widening accessibility and reducing friction for non-English users. - Release-ready packaging and configuration improvements aligning with the 5.0.1 milestone and global cfg standardization. Technologies/skills demonstrated - Deep C/C++ systems programming across multiple subsystems (video, storage, I/O, bus controllers, machine tables). - Emulation architecture improvements (device_t integration, KBC unification, ECP/EPP wiring). - Build, packaging, and tooling enhancements (CMake, VDE-VDF, release management). - Debugging and diagnostics at scale, including logging system overhaul and crash-prevention strategies. - Localization/internationalization workflows and PO/ POT management for multi-language support.
178 Commits • 47 Features
Aug 1, 2025August 2025 monthly summary for 86Box/86Box: Key features delivered - IDE initialization improvements and CMD-64x option ROM support, with CMD-648 option ROM support added. Commit highlights: a16f28fab5ce72dbf67c97ea8911aab817df4a8a; 33af41683643ab54090c26b65f751f5afdb00242. - Machine table overhaul and internal reorganization enabling more robust machine handling and KBC integration; added support for FIC PO-6000. Related work includes the great internal machine reorganization and machine_table.c changes, plus initial/second rounds of machine updates. Commits showcase: d2c8dab3427730f3e9669c1360378be8c51fcda9; 4b851ad0bb29fa9fa81ee674343bd7948f055977; 6de179581d1e85ed245c4ec42501ae06ef58de6e. - FDC37x family fixes and ECP/EPP integration enabling richer disk controller emulation and stability. Key commits: 633308be28cbf23e9c3e2cd810146f8d9cd5ad35; 87c37650716ce7975f07ffc43ce4e646a2bfccaf; c0d9d6aef927b7eb680a40eaae4c17a5ad8a3bcd; 711e09e08b99f8ae4f53f1e6ebb1a14400e7e7c8. - LPT ports migrated to device_t representations, simplifying port management and improving compatibility across machines. Commit: b9e294b781b1db4023bb9f32eba025f58ca060a7. - CD-ROM and CD-ROM image reliability improvements, including CRC/ECC handling refinements, multi-session cue sheet handling fixes, and image loading improvements. Notable commits: 411c239771a4b9299ff5ce1dbbcd27429320912d; 9a25de86b31808cfbd1678b8635dbafc5e951e36; ce9c40e058e36337a0ef3874e1d8a17766593f60; a1b0d535e13d7fbc69f73b5d81d41ded0d08f2d9; bf61d75056604c6c47b160856d3140d34b2ee79f; de00b76668babd6ce70f41672a02d3792a21b7ec; 7b624bb6a635ac3caa921fd6461cdf991da79bce; 8ea2d12dca93ec7617298526d2f60caec4ffd84f. - Localization and translations improvements across Slovenian, Portuguese, Spanish, Czech, Slovak, Korean, Traditional Chinese, Simplified Chinese, Norwegian, Dutch, Croatian, Italian, Japanese, Ukrainian, Russian, French, Swedish and more; string updates and true color support added. Representative commits: 2cc61b6a5933b79107a77df825a9483e5cdf17c4; 8806b8ca45d09c81a29482e466f19f98eeee3b5a; 93d3e4a3ab9cff9d50bc72b1cc33d4307affe3ea; 9d09e3dbaf8050d13a8d43b3fed0942202333b84; multiple others. - Release readiness: Version bumped to 5.0.1 and global config rename completed to 86box_global.cfg, aligning packaging and defaults. Notable commits: 75049ae6288b4710a00240d711034ba901910a09; 1670ae1cfa43fb74f00ac5bc6aba96fd0d868456. Major bugs fixed - VGA render: addressed out-of-bounds writes, reducing crash risk and improving render stability. Commit: 5164ce9c82332284a919e0205c0cf07477519c0a. - MKE CD-ROM: corrected 8-bit ISA width; resolved potential hardware emulation mismatch. Commit: 0d093330f47fda4def45b54cdf42446a4fd79cdd. - Hard disk controller settings: now actually uses instantiated configuration settings, improving realism and reliability. Commit: 3e800db1245a2a7d0f1b190a04d083177131e8e6. - Misc header and header-related fixes: restored missing cdrom.h reference, fixed stray pre-device_t leftovers, and corrected various compilation and initialization issues across subsystems. Commits: a828626177f55c101ce35d1bf85258cf508c27be; 442c029facf70c5c752e5914ae41f7f0c7177af6; e415e23404e8d92dc900affe1ec24e9032e7fedd; 9842ef63465ba24d6d5c800597ce0b2887e18847. - Logging, UI and stability improvements: cleaned up excess logging, improved help text safety, and reduced noise in the UI and logs; addressed segmentation fault risks in help prints and VM/UI related warnings. Representative commits: 0da985dd9313c7bb5f65484595569767b5c91f8d; f9865b159a1f7dcb8967f307dafc411053b17b82; 5d5913ac278cf2acf4e081ebab53de6b91746144; 324e1480ef9de8dd81b64905a2a7b6d11d97091a; 8eefb0fe95940c16fbea0af8398e399577a46de6. - Stability fixes for VM Manager, SCSI/UI readability, and platform-specific warnings; including fixes to CLang warnings and specific machine drivers. Representative commits: 413bf3dbe8168dd3525fdb2d742c31a69c9e6fe7; a0f6644e0065b0ac4b7cbf549291ca941acb9fba; c2c964199230a324f0c3e9e41f616378b5534672; d7a714185c202c7fe2093c15240bfd772384247e. - Release hygiene: improved configuration loading, saving and remapping capabilities for long-term maintainability. Commits: c3fae26ec7253e1deb859ad089164c2f277aa341; 50cf7330a31bd84be28410f8bb023883d3ae59d1. Overall impact and accomplishments - Substantial expansion of hardware compatibility and fidelity with new machines and refined device models, enabling more accurate and richer emulation for a broader user base. - Improved stability, especially in critical paths (CD-ROM, VGA rendering, LPT/DMA/keyboard controllers), reducing crash reporters and user-reported issues. - Architectural enhancements (device_t migration, machine_table refactor, KBC unification) that reduce technical debt and simplify future feature work. - Internationalization and localization improvements, widening accessibility and reducing friction for non-English users. - Release-ready packaging and configuration improvements aligning with the 5.0.1 milestone and global cfg standardization. Technologies/skills demonstrated - Deep C/C++ systems programming across multiple subsystems (video, storage, I/O, bus controllers, machine tables). - Emulation architecture improvements (device_t integration, KBC unification, ECP/EPP wiring). - Build, packaging, and tooling enhancements (CMake, VDE-VDF, release management). - Debugging and diagnostics at scale, including logging system overhaul and crash-prevention strategies. - Localization/internationalization workflows and PO/ POT management for multi-language support.
August 2025
July 2025
99 Commits • 21 Features
Jul 1, 2025July 2025 (2025-07) monthly summary for 86Box/86Box. This period delivered targeted hardware-emulation enhancements, expanded media and peripheral support, and reliability improvements that drive business value by widening hardware compatibility, improving user experience, and reducing maintenance friction across the project. The work reflects steady progress in core emulation accuracy, performance tuning, and cross‑platform compatibility.
July 2025
99 Commits • 21 Features
Jul 1, 2025July 2025 (2025-07) monthly summary for 86Box/86Box. This period delivered targeted hardware-emulation enhancements, expanded media and peripheral support, and reliability improvements that drive business value by widening hardware compatibility, improving user experience, and reducing maintenance friction across the project. The work reflects steady progress in core emulation accuracy, performance tuning, and cross‑platform compatibility.
June 2025
58 Commits • 9 Features
Jun 1, 2025June 2025 performance snapshot for 86Box/86Box. Delivered wide-ranging SVGA/VGA overscan stabilization and rendering improvements, expanded hardware/ROM coverage, and a broad set of stability, compatibility, and maintenance fixes across I/O, graphics, and cross‑platform builds. These efforts improve display accuracy, broaden hardware emulation support, reduce regression risk, and enhance code quality and developer efficiency.
58 Commits • 9 Features
Jun 1, 2025June 2025 performance snapshot for 86Box/86Box. Delivered wide-ranging SVGA/VGA overscan stabilization and rendering improvements, expanded hardware/ROM coverage, and a broad set of stability, compatibility, and maintenance fixes across I/O, graphics, and cross‑platform builds. These efforts improve display accuracy, broaden hardware emulation support, reduce regression risk, and enhance code quality and developer efficiency.
June 2025
May 2025
106 Commits • 30 Features
May 1, 2025May 2025 monthly summary for 86Box/86Box. The team delivered core emulation improvements, expanded hardware support, and improved build and maintenance processes, resulting in higher compatibility, stability, and performance across a broad set of machines. Key features delivered this month: - SiS RAM/DRAM handling improvements for SiS 85c471/471 families: enhanced DRAM banks/rows logic and RAM limit calculations; fixes to RAM bank values across SiS 85c471, 471, and related models; several device-specific RAM limit updates (Acer V60N/V62X) to prevent invalid configurations. - RZ-1000 PCI IDE controller support: implemented the RZ-1000 PCI IDE controller to support certain Intel-era machines requiring PCI IDE functionality. - SM(S)C FDC37C93x Super I/O rewrite and related maintenance: rewritten Super I/O support, added Acer V62x, and un-dev-branch the Laser XT materials to align with stable branches. - Ambra DP60 and PS/ValuePoint P60 hardware support: added Ambra DP60 and PS/ValuePoint P60 hardware support with IDE controller configuration aligned to IBM hardware references. - Build system and code cleanup improvements: updated the root CMakeLists.txt for build system reliability and reduced noise; removed unused code paths (mmu_perm) to simplify maintenance. Major bugs fixed: - MMX_ENTER() exceptions, CD-ROM image close semantics for cue-sheets, VISO code sanity checks, and out-of-bounds FDC register reads to improve stability. - RAM/DRAM edge-case fixes (VTech Laser TX RAM step, Acer V60N/V62X DRAM slot limits) to prevent black screens and invalid memory configurations. - Keyboard/reset and input handling resiliency (keyboard reset behavior, AT/PS2 keyboard input during reset) to eliminate spurious errors. - Various FDC/VL82C480 and BIOS-related fixes to reduce crashes and improve compatibility across machines. Overall impact and accomplishments: - Substantial improvement in hardware compatibility and user experience across a wide range of emulated systems. - More reliable emulation of memory-configurations and PCI IDE scenarios, enabling users to run additional hardware profiles with confidence. - Improved build reliability and maintainability, enabling faster delivery of features and fixes. Technologies/skills demonstrated: - C/C++ emulation core improvements, RAM/DRAM modeling accuracy, and hardware-agnostic bug isolation. - Build system modernization using CMake and code cleanup to simplify maintenance. - Cross-subsystem collaboration, feature integration across RAM, I/O, BIOS, and device layers, and performance-oriented optimizations (e.g., DMA-based floppy speed up).
May 2025
106 Commits • 30 Features
May 1, 2025May 2025 monthly summary for 86Box/86Box. The team delivered core emulation improvements, expanded hardware support, and improved build and maintenance processes, resulting in higher compatibility, stability, and performance across a broad set of machines. Key features delivered this month: - SiS RAM/DRAM handling improvements for SiS 85c471/471 families: enhanced DRAM banks/rows logic and RAM limit calculations; fixes to RAM bank values across SiS 85c471, 471, and related models; several device-specific RAM limit updates (Acer V60N/V62X) to prevent invalid configurations. - RZ-1000 PCI IDE controller support: implemented the RZ-1000 PCI IDE controller to support certain Intel-era machines requiring PCI IDE functionality. - SM(S)C FDC37C93x Super I/O rewrite and related maintenance: rewritten Super I/O support, added Acer V62x, and un-dev-branch the Laser XT materials to align with stable branches. - Ambra DP60 and PS/ValuePoint P60 hardware support: added Ambra DP60 and PS/ValuePoint P60 hardware support with IDE controller configuration aligned to IBM hardware references. - Build system and code cleanup improvements: updated the root CMakeLists.txt for build system reliability and reduced noise; removed unused code paths (mmu_perm) to simplify maintenance. Major bugs fixed: - MMX_ENTER() exceptions, CD-ROM image close semantics for cue-sheets, VISO code sanity checks, and out-of-bounds FDC register reads to improve stability. - RAM/DRAM edge-case fixes (VTech Laser TX RAM step, Acer V60N/V62X DRAM slot limits) to prevent black screens and invalid memory configurations. - Keyboard/reset and input handling resiliency (keyboard reset behavior, AT/PS2 keyboard input during reset) to eliminate spurious errors. - Various FDC/VL82C480 and BIOS-related fixes to reduce crashes and improve compatibility across machines. Overall impact and accomplishments: - Substantial improvement in hardware compatibility and user experience across a wide range of emulated systems. - More reliable emulation of memory-configurations and PCI IDE scenarios, enabling users to run additional hardware profiles with confidence. - Improved build reliability and maintainability, enabling faster delivery of features and fixes. Technologies/skills demonstrated: - C/C++ emulation core improvements, RAM/DRAM modeling accuracy, and hardware-agnostic bug isolation. - Build system modernization using CMake and code cleanup to simplify maintenance. - Cross-subsystem collaboration, feature integration across RAM, I/O, BIOS, and device layers, and performance-oriented optimizations (e.g., DMA-based floppy speed up).
April 2025
61 Commits • 14 Features
Apr 1, 2025April 2025 (2025-04) focused on stability, compatibility, and performance across core emulation paths, delivering targeted recompiler adjustments, audio handling fixes, I/O/storage enhancements, and readiness for the 5.0 release baseline. Highlights include: 1) Recompiler: Temporarily disable recompilation for exactly four memory versions in 32-bit address space to avoid NTVDM regressions; 2) VIA AC'97: Restore 0x47 handling and fix divisor to 208925 to keep audio headroom; 3) Intel Premiere/PCI: Introduce dual-channel IDE controller for improved throughput and reliability (fixes #5442); 4) PCI/ACPI: Reset RAM when resetting all devices to zero out emulated RAM, improving Windows 2000 post-reset stability; 5) CD-ROM: Recalculate model list on CD-ROM selection change and select the correct type. The month also included targeted bug fixes and portability/build hygiene to support a smoother 5.0 release.
61 Commits • 14 Features
Apr 1, 2025April 2025 (2025-04) focused on stability, compatibility, and performance across core emulation paths, delivering targeted recompiler adjustments, audio handling fixes, I/O/storage enhancements, and readiness for the 5.0 release baseline. Highlights include: 1) Recompiler: Temporarily disable recompilation for exactly four memory versions in 32-bit address space to avoid NTVDM regressions; 2) VIA AC'97: Restore 0x47 handling and fix divisor to 208925 to keep audio headroom; 3) Intel Premiere/PCI: Introduce dual-channel IDE controller for improved throughput and reliability (fixes #5442); 4) PCI/ACPI: Reset RAM when resetting all devices to zero out emulated RAM, improving Windows 2000 post-reset stability; 5) CD-ROM: Recalculate model list on CD-ROM selection change and select the correct type. The month also included targeted bug fixes and portability/build hygiene to support a smoother 5.0 release.
April 2025
March 2025
114 Commits • 18 Features
Mar 1, 2025March 2025 monthly summary for 86Box/86Box focusing on business value, stability, and technical achievement across the codebase. Highlights include code organization improvements, rendering/graphics fidelity, performance optimizations, and cross-platform portability enhancements, underpinned by a solid set of critical bug fixes.
March 2025
114 Commits • 18 Features
Mar 1, 2025March 2025 monthly summary for 86Box/86Box focusing on business value, stability, and technical achievement across the codebase. Highlights include code organization improvements, rendering/graphics fidelity, performance optimizations, and cross-platform portability enhancements, underpinned by a solid set of critical bug fixes.
February 2025
68 Commits • 14 Features
Feb 1, 2025February 2025 monthly summary for 86Box/86Box focusing on key features delivered, major bugs fixed, and impact across performance and reliability.
68 Commits • 14 Features
Feb 1, 2025February 2025 monthly summary for 86Box/86Box focusing on key features delivered, major bugs fixed, and impact across performance and reliability.
February 2025
January 2025
61 Commits • 8 Features
Jan 1, 2025January 2025 performance summary for 86Box/86Box focused on stability, compatibility, and memory subsystem fidelity. Key work included a rewrite of the CD-ROM image handling and Cue sheet parsing to prevent crashes (notably with VISO) and more robust cue parsing for .cue files; restoration of Windows hook input with fixes for right Shift and Pause handling to improve input reliability across multi-monitor setups; substantial CD-ROM subsystem cleanup (mounting stability, log handling, image_open naming, and read-sector error handling) and safer image unloading. In memory and hardware emulation, NEAT gained Shadow RAM and EMS handling improvements with corrected memory mapping and POST behavior, while SCAMP EMS state handling was stabilized; targeted fixes across ES1370 detection, PS/ValuePoint FDD checks, PIC IRQ handling, keyboard controller behavior, and INT 10h FPU exception handling reduced edge-case failures. Additional work covered translation/UI warning improvements and Unix/Linux portability fixes. Overall, the month delivered tangible business value by increasing emulation stability, hardware compatibility, and user-facing reliability, enabling smoother gameplay experiences and lowering support overhead.
January 2025
61 Commits • 8 Features
Jan 1, 2025January 2025 performance summary for 86Box/86Box focused on stability, compatibility, and memory subsystem fidelity. Key work included a rewrite of the CD-ROM image handling and Cue sheet parsing to prevent crashes (notably with VISO) and more robust cue parsing for .cue files; restoration of Windows hook input with fixes for right Shift and Pause handling to improve input reliability across multi-monitor setups; substantial CD-ROM subsystem cleanup (mounting stability, log handling, image_open naming, and read-sector error handling) and safer image unloading. In memory and hardware emulation, NEAT gained Shadow RAM and EMS handling improvements with corrected memory mapping and POST behavior, while SCAMP EMS state handling was stabilized; targeted fixes across ES1370 detection, PS/ValuePoint FDD checks, PIC IRQ handling, keyboard controller behavior, and INT 10h FPU exception handling reduced edge-case failures. Additional work covered translation/UI warning improvements and Unix/Linux portability fixes. Overall, the month delivered tangible business value by increasing emulation stability, hardware compatibility, and user-facing reliability, enabling smoother gameplay experiences and lowering support overhead.
December 2024
44 Commits • 9 Features
Dec 1, 2024December 2024: Implemented critical features and fixes in 86Box, enhancing hardware emulation fidelity, stability, and performance across PS/2 drives, memory mapping, timing, input handling, and device emulation. Key features delivered include PS/2 drive integration with machine-based polarity, logging controls to reduce runtime noise, and memory/disk image enhancements. Major bug fixes include FDC improvements on MCA IBM PS/2, SCAT symbol inclusion, EMS mapping memory state corrections, CPL checks scoped to protected mode, and ESS AudioDrive readouts corrections. Platform timing and input handling improvements replaced thread sleeps with plat_delay_ms and introduced a robust low-level keyboard hook with host/guest isolation. The results: higher hardware accuracy, fewer build warnings and cross-platform issues, improved user experience, and reduced maintenance overhead.
44 Commits • 9 Features
Dec 1, 2024December 2024: Implemented critical features and fixes in 86Box, enhancing hardware emulation fidelity, stability, and performance across PS/2 drives, memory mapping, timing, input handling, and device emulation. Key features delivered include PS/2 drive integration with machine-based polarity, logging controls to reduce runtime noise, and memory/disk image enhancements. Major bug fixes include FDC improvements on MCA IBM PS/2, SCAT symbol inclusion, EMS mapping memory state corrections, CPL checks scoped to protected mode, and ESS AudioDrive readouts corrections. Platform timing and input handling improvements replaced thread sleeps with plat_delay_ms and introduced a robust low-level keyboard hook with host/guest isolation. The results: higher hardware accuracy, fewer build warnings and cross-platform issues, improved user experience, and reduced maintenance overhead.
December 2024
November 2024
61 Commits • 14 Features
Nov 1, 2024November 2024 for 86Box/86Box delivered a major architectural upgrade, substantial UX/terminology improvements, and targeted feature enhancements that together improve performance, international accessibility, and platform reliability. Key momentum came from a performance-focused core change (Dynamic Recompiler), enhanced device I/O and emulation touchpoints, and a broad localization effort, all paired with stability fixes across multiple platforms and configurations.
November 2024
61 Commits • 14 Features
Nov 1, 2024November 2024 for 86Box/86Box delivered a major architectural upgrade, substantial UX/terminology improvements, and targeted feature enhancements that together improve performance, international accessibility, and platform reliability. Key momentum came from a performance-focused core change (Dynamic Recompiler), enhanced device I/O and emulation touchpoints, and a broad localization effort, all paired with stability fixes across multiple platforms and configurations.
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Quality Metrics
Correctness90.6%
Maintainability89.2%
Architecture86.6%
Performance84.4%
AI Usage20.2%
Skills & Technologies
Programming Languages
AssemblyBatchCC#C++CMakeCSSCXXDartGLSL
Technical Skills
ACPIATAPI integrationAlgorithm implementationAssemblyAssembly LanguageAssembly language programmingAudio Driver DevelopmentAudio EmulationAudio Hardware EmulationAudio ProcessingAudio ProgrammingAudio processingBIOSBIOS ConfigurationBIOS Development
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