MAME vs Nexen

MAME is a free emulation framework intended to preserve software history by documenting and reproducing the inner components of arcade machines, computers, consoles, calculators, and other electronic amusement systems. It can emulate over 32,000 individual systems from the last five decades. Alongside emulation, it includes an interactive low-level debugger for investigating software behavior, diagnosing emulation issues, and developing software for vintage systems. Its Lua interface can inspect device state, access CPU registers, read and write memory, and draw overlays, though the API may change without notice. Plugins support uses such as external-program communication and alternate interfaces; included examples are Discord Presence and a GDB Stub. MAME can save and load states, record inputs for playback, and capture screenshots or video. It is available for Android, Linux, macOS, and Windows; official Windows binaries require Windows 10 or later. BIOS dumps and copyrighted software are generally not included. The project is distributed under GPL-2.0 overall, while more than 90% of files, including core files, are under BSD-3-Clause.

Nexen is a free, open source multi-system emulator for Windows, Linux, and macOS. It lists eight fully supported systems: NES, SNES, Game Boy and Color, Game Boy Advance, Master System and Game Gear, PC Engine, WonderSwan, and Atari Lynx. CPU and PPU emulation is cycle-accurate, with full coprocessor support listed for several SNES chips. Each game can have unlimited timestamped saves, a visual picker, and 36 rolling checkpoints at five-minute intervals. Movie tools support frame-by-frame recording and playback, rerecording, and imports and exports for BK2, FM2, SMV, LSMV, VBM, and GMV files. A TAS editor provides a piano-roll timeline, undo and redo, greenzone seeking, alternate branches, and Lua scripting. Debugging tools include a disassembler, memory viewer, breakpoints, trace and code/data logging, and a profiler. Nexen also lists rollback netplay and exports symbols, code coverage data, cross-references, and source maps to Pansy for the Flower Toolchain. Sega Genesis, Atari 2600, and Fairchild Channel F support remain in progress.