A
Machines, operating systems and chips beginning with A.
Emulators
| Emulator | What it emulates | Type |
|---|---|---|
| ACE-DL | High-accuracy Amstrad CPC/Plus and GX4000 emulator by Roudoudou. | downloadable |
| ANITA | A working model of the ANITA Mk VIII (Sumlock, 1961), the world's first all-electronic desktop calculator — its full keyboard, cold-cathode arithmetic unit and Nixie tube display — running in a web browser. | online |
| ARAnyM | Virtual machine for running Atari ST/TT/Falcon 32-bit software on modern hardware. | downloadable |
| Acorn Archimedes | Acorn Archimedes emulator running in your browser: Arculator (Sarah Walker) compiled to WebAssembly, booting RISC OS 3.11 on an ARM2. | online |
| Acorn Atom | Browser-based JavaScript emulator of the Acorn Atom. | online |
| Advanced Mac Substitute | API-level reimplementation that runs classic 68k Mac applications with no Apple ROM or system software. | both |
| AetherSX2 | Free, closed-source PlayStation 2 emulator for mobile devices based on the PCSX2 core. | downloadable |
| Agon Light | An Agon Light, the 2022 open-source eZ80 home computer, booting to MOS and BBC BASIC directly in a web browser. | online |
| Altirra | High-accuracy Atari 8-bit computer emulator and hardware debugger for Windows by Avery Lee. | downloadable |
| AmiKit | Pre-configured modern Amiga emulation environment bundling hundreds of AmigaOS apps and games. | downloadable |
| Amiberry | Optimized cross-platform Amiga emulator with WinUAE-derived accuracy and built-in WHDLoad support. | downloadable |
| Amiga Forever | Cloanto's official Amiga emulation, preservation and support suite with licensed Kickstart ROMs and Workbench. | downloadable |
| Analytical Engine | A working model of Charles Babbage's Analytical Engine (designed 1837) — the Mill, the Store and the punched-card program — running in a web browser. | online |
| Anex86 | Fast EPSON PC-98 compatible emulator, historically the most popular PC-98 emulator in Japan. | downloadable |
| Apollo Guidance Computer | The MIT/NASA Apollo Guidance Computer that flew Apollo to the Moon, running the real Colossus flight rope and its DSKY in the browser. | online |
| Apple IIgs (KEGS) | In-browser Apple IIgs (KEGS core, WDC 65C816) with a full live debugger. | online |
| Apple2TS | Browser-based Apple IIe emulator written in TypeScript. | online |
| AppleWin | Comprehensive open-source Apple II emulator for Windows. | downloadable |
| ArcEm | Portable open-source Acorn Archimedes emulator capable of running RISC OS and ARM Linux. | downloadable |
| Archimedes Live! | Online Acorn Archimedes emulator that runs early ARM software in the browser. | online |
| Arculator | Freeware Acorn Archimedes emulator by Sarah Walker covering the A305 through A5000. | downloadable |
| Arduino Uno (AVR) | An Arduino Uno (ATmega328P / AVR) that runs a compiled sketch in a web browser: blinking LEDs and serial output, with a full AVR debugger. | online |
| Arnold | Accurate Amstrad CPC emulator originally written by Kevin Thacker. | downloadable |
| Asteroids | The original 1979 Atari Asteroids arcade machine, running in the browser with an in-frame MOS 6502 debugger. | online |
| Atari 5200 | Browser emulator of the Atari 5200 SuperSystem (1982), the Atari 8-bit console, with a full in-page 6502 debugger. | online |
| Atari Lynx (Handy) | In-browser Atari Lynx emulator, a compact pure-JavaScript 65C02 + Mikey core booting a colour insert screen, with a live 65C02 debugger and on-screen Lynx gamepad. | online |
| Atari ST (EstyJS) | In-browser Atari 1040ST emulator, the pure-JavaScript EstyJS core booting EmuTOS to the GEM desktop, with a live 68000 debugger. | online |
| Atari++ | Cycle-precise Atari 8-bit and 5200 emulator by Thomas Richter. | downloadable |
| Atari800 | Long-running portable emulator of the Atari 8-bit computer line and the 5200 console. | downloadable |
| Atari800MacX | Native macOS port of the Atari800 emulator with a full Cocoa interface. | downloadable |
| altair8800 | A MITS Altair 8800 that boots Microsoft 8K BASIC to the classic MEMORY SIZE? prompt directly in a web browser. | online |
| appl.emu | A pure-JavaScript Apple-1 that boots to Steve Wozniak's Wozmon monitor in the browser. | online |
| apple2js | Apple II emulator written in JavaScript/TypeScript that runs in the browser. | online |
| ares | Accuracy-focused multi-system emulator continuing the higan lineage with N64 and PlayStation support. | downloadable |