40 lines
2.8 KiB
Markdown
40 lines
2.8 KiB
Markdown
quickerNES
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-----------
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[](https://github.com/SergioMartin86/quickerNES/actions/workflows/make.yml)
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quickerNES is an attempt to modernizing [quickNES](https://github.com/kode54/QuickNES). The goals for this project are, in order of importance:
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- Improve overall emulation performance for modern (x86) CPUs (portability to other systems not guaranteed)
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- Modernize the code base with best programming practices, including CI tests, benchmarks, and coverage analysis
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- Add support for more mappers, controllers, and features supported by other emulators
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- Improve accuracy, if possible
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The main aim is to improve the performance of headless re-recording for TASing and botting (See: [JaffarPlus](https://github.com/SergioMartin86/jaffarPlus)) purposes. However, if this work can help regular play emulation, then much better.
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Improvements
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-------------
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- Optimizations made in the CPU emulation core, including:
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+ Forced alignment at the start of a page to prevent crossing cache line boundaries
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+ Simplifying the 6502 CPU instruction fetching and decoding
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+ Multiple branch optimizations
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+ Assuming little endiannes to reduce unnecessary conversion operations (not portable to big endian systems)
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+ Minimize compiled code size to reduce pressure on L1i cache
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- Added support for FourScore controller
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- General code reorganization (make it header only to help compiler optimizations)
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Credits
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---------
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- quickNES was originally by Shay Green (a.k.a. [Blaarg](http://www.slack.net/~ant/)) under the GNU GPLv2 license. The source code is still located [here](https://github.com/kode54/QuickNES)
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- The code was later improved and maintained by Christopher Snowhill (a.k.a. [kode54](https://kode54.net/))
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- I could trace further contributions (e.g., new mappers) by retrowertz, CaH4e3, some adaptations from the [FCEUX emulator](https://github.com/TASEmulators/fceux) (see mapper021)
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- The latest version of the code is maintained by Libretro's community [here](https://github.com/libretro/QuickNES_Core)
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- For the interactive player, this project drew some code from [HeadlessQuickNES (HQN)](https://github.com/Bindernews/HeadlessQuickNes) by Drew (Binder News)
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- We use some of the [NES test rom set](https://github.com/christopherpow/nes-test-roms) made by multiple authors and gathered by Christopher Pow et al.
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- We also use some movies from the [TASVideos](tasvideos.org) website for testing. These movies are copied into this repository with authorization under the Creative Commons Attribution 2.0 license.
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All base code for this project was found under open source licenses, which I preserved in their corresponding files/folders. Any non-credited work is unintentional and shall be immediately rectfied.
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