A/NES 1.22 improves Nintendo emulation on classic AmigaOS
A/NES 1.22 lands with sprite fixes and Famicom Disk System cleanup for real 68k Amigas, where every cycle still counts.
A/NES 1.22 landed on Aminet on May 11, 2026, and the headline is not a flashy new feature so much as the kind of repair that matters on real classic AmigaOS hardware: better sprite handling, tighter performance, and cleaner Famicom Disk System behavior.
That focus fits the machine it runs on. A/NES is still the only NES and Famicom emulator in development for classic AmigaOS, and it is written in 100% 680x0 assembler. The older 1.21 package said it needed at least a 68020 CPU, AGA chipset, and 2 to 4 MB of FastRAM, with 68040 and 68060 systems strongly recommended. The feature list is unusually deep for a niche Amiga project: full 6502 emulation, battery backup support, Action Replay and Game Genie codes, sound, split-screen scrolling, two-player support, Vs. Unisystem support, CD32 joypad support, XPK support, and partial Famicom Disk System emulation.
That is why the sprite work in 1.22 matters. On NES hardware, sprites are not a minor detail. They are the moving pieces that make a game feel correct or broken, and even small timing errors can turn a clean boot into a visibly rough experience. A/NES has been chasing those edges for years. Version 1.21, released on November 6, 2023, added unofficial 6502 opcodes and minor sprite-related optimizations. Version 1.2, back in 2021, fixed a Sprite-DMA crash and stripped out old debug code that had been slowing the emulator down. Earlier builds added FDS timer IRQs, improved timing, 8x16 sprite bug fixes, and support for mid-screen sprite-pattern changes.
The result is an emulator that keeps getting more precise where classic games are most sensitive. That matters especially for the Famicom Disk System side of the library, where compatibility work can open up software that sits outside the familiar cartridge set. A/NES has always been a preservation project as much as a playability tool: Morgan Johansson and Fredrik Schultz built it for classic Amiga hardware, and the platform around it still treats 680x0 emulation as part of its identity. A/NES 1.22 does not try to compete with giant modern emulators. It does one job inside a tight hardware envelope, and it keeps making that job better.
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