Nesalizer

Spec sheet

Purpose

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

Platforms

The README says a *nix system is currently required and describes an experimental Windows port by a contributor.Read 4 Oct 2026 · github.com

Support

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

License

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

Audio

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

Build dependency

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

Compatibility

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

Controls

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

Interface

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

Memory use

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

Movie recording

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

Operating system

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

Performance

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

Rewind

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

Rewind memory

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

Save states

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

Support and contributions

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

TV systems

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

Video standards

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

Windows status

The README describes a quick-and-dirty experimental Windows port by a contributor.Read 8 Oct 2026 · github.com

Where Specifiction places it

• NES Emulators#17 of 267.1