R
Machines, operating systems and chips beginning with R.
Emulators
| Emulator | What it emulates | Type |
|---|---|---|
| RCA Studio II | An in-browser RCA Studio II (1977): the authentic system ROM on a hand-written RCA 1802 core with CDP1861-style video and twin keypads, plus a full debugger. Boots a cartridge to graphics. | online |
| RISC-V (Linux) | In-browser RISC-V machine (TinyEMU compiled to WebAssembly) that boots a Buildroot Linux to a busybox shell, with a full RISC-V CPU debugger. | online |
| RPCEmu | Open-source emulator of Acorn's Risc PC and A7000 that boots RISC OS. | downloadable |
| Rainbow | Closed-source Windows emulator for the Atari 400/800/XL/XE and 5200 by Chris Lam. | downloadable |
| Raspberry Pi (ARM Linux) | Boots REAL ARM Linux (3.10.29) to a BusyBox shell in the browser via the vendored pure-JS arm-js emulator, with a full ARM debugger. Honest: emulated as an ARMv7-A Versatile Express (Pi-class ARM), not true Broadcom Pi silicon; serial console only (no GPU/desktop). | online |
| Raspberry Pi Pico | The real Raspberry Pi Pico in the browser: the RP2040's dual ARM Cortex-M0+ on the vendored rp2040js SoC, booting real MicroPython and bare-metal firmware with a full Thumb debugger. | online |
| Raspberry Pi Pico 2 | The real Raspberry Pi Pico 2 in the browser: the RP2350's dual Arm Cortex-M33 / Hazard3 RISC-V on the vendored rp2350js SoC, booting real MicroPython and bare-metal firmware with a full Thumb debugger. | online |
| Raspberry Pi Pico W | The real Raspberry Pi Pico W in the browser: the RP2040 dual Cortex-M0+ plus a high-level Infineon CYW43439 WiFi chip on the vendored rp2040js, booting real MicroPython — with the on-board LED driven over the CYW43 WiFi chip (WL_GPIO0), and a full Thumb debugger. | online |
| RealSpectrum | DOS and Windows ZX Spectrum emulator noted for early cycle-accurate emulation. | downloadable |
| Red Squirrel | Freeware Windows emulator of ARM-based Acorn machines by Graeme Barnes. | downloadable |
| Regen | Accuracy-focused freeware Sega 8/16-bit emulator by AamirM. | downloadable |
| Retro Virtual Machine | Freeware ZX Spectrum and Amstrad CPC emulator with authentic CRT visuals and a virtual tape deck. | downloadable |
| RetroArch | A single front end that loads dozens of emulator "cores" through libretro. | both |
| Robotron KC85/3 | The East-German KC85/3 home computer (U880 / Z80), emulated in WebAssembly from floooh's chips project, boots to the CAOS 3.1 menu. | online |
| Robotron Z1013 | The East-German Robotron Z1013 single-board home computer (U880 / Z80, 1985), emulated in WebAssembly from floooh's chips project, boots to its resident monitor prompt. | online |
| Roland | JavaScript Amstrad CPC emulator with sound by Antonio Villena. | online |
| Rosalie's Mupen GUI | Modern Qt front-end and distribution of the Mupen64Plus Nintendo 64 emulator. | downloadable |
| RuMSX | Multilingual Windows emulator of the MSX, MSX2, MSX2+ and turbo R. | downloadable |
| redream | Fast, user-friendly Sega Dreamcast emulator with high-resolution rendering. | downloadable |
| reicast | Multiplatform open-source Sega Dreamcast emulator, the basis for Flycast. | downloadable |