Nesalizer

On the record

Audio

During rewind, audio is added in reverse from the end of the audio buffer.github.com · read 8 Oct 2026

Build dependency

SDL2 is the only dependency for final output.github.com · read 8 Oct 2026

Compatibility

The README lists supported iNES mappers as 0, 1, 2, 3, 4, 5, 7, 9, 10, 11, 13, 28, 71, and 232.github.com · read 8 Oct 2026

Controls

Controls are hardcoded and include keyboard mappings for the D-pad, A, B, Start, Select, rewind, save/load state, and reset.github.com · read 4 Oct 2026

Interface

The emulator lacks a GUI and its controls are hardcoded.github.com · read 8 Oct 2026

License

The project is licensed under GPLv2.github.com · read 8 Oct 2026

Memory use

A 30-minute rewind buffer uses around 1.3 GB of memory for most games, and states are not compressed.github.com · read 4 Oct 2026

Movie recording

Built-in movie recording support is described as broken due to libav changes.github.com · read 4 Oct 2026

Operating system

The project says it currently requires a *nix system and provides Ubuntu build commands.github.com · read 8 Oct 2026

Performance

The author reports about 6× emulation speed on a single core of an older Core i7 2600K.github.com · read 4 Oct 2026

Purpose

Nesalizer is a work-in-progress NES emulator with real-time rewind that correctly reverses sound.github.com · read 8 Oct 2026

Rewind

It stores emulator state once per frame in a ring buffer and loads states in reverse order during rewind.github.com · read 8 Oct 2026

Rewind memory

A 30-minute rewind buffer uses around 1.3 GB of memory for most games, and states are not compressed.github.com · read 8 Oct 2026

Save states

Save states are in memory and are not saved to disk; persistent on-disk save states are listed as missing.github.com · read 8 Oct 2026

Support

The README invites bug reports and contributions and provides the author's email in reversed form.github.com · read 4 Oct 2026

Support and contributions

The author invites users to report issues and contribute to the project.github.com · read 8 Oct 2026

TV systems

Both PAL and NTSC are supported, and the README recommends NTSC ROMs.github.com · read 4 Oct 2026

Video standards

It supports both PAL and NTSC, and the README recommends NTSC ROMs.github.com · read 8 Oct 2026

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