NoSTalgia

Version 2.0

Atari ST Emulator for macOS

NoSTalgia 2.0 Screenshot

Native Apple Silicon

Built from the ground up for M1/M2/M3/M4 Macs. Metal-accelerated display, SwiftUI interface, perfectly integrated with macOS.

Moira CPU Core

Precise MC68000 CPU emulation using the Moira core with cycle-accurate timings.

Accurate Hardware

MFP 68901, ACIA 6850, DMA controller, FDC and Shifter emulation at hardware level.

Blitter & Overscan

Full BLiTTER chip emulation. Top/bottom overscan support for demos with border removal tricks.

Hard Disk Emulation

Built-in NoSTalgia HDD driver (in ROM) with FAT16 images for easy Mac/Atari file exchange. ACSI emulation with AHDI partition format.

Floppy Support

Read and write ST and MSA disk images. Disk protection bypass option available.

YM2149 Sound

Accurate YM2149 PSG emulation with DMA sample playback for faithful Atari ST sound reproduction.

EmuTOS Included

Ships with EmuTOS, a free open-source TOS replacement. Original TOS ROMs also supported.

Mouse Sync

Optional synchronization between Mac mouse and GEM mouse cursor for seamless integration.

Keyboard Joystick

Use arrow keys and A button as joystick. Perfect for games without a physical controller.

Debugger

Built-in CPU debugger with register inspection, step-by-step execution and hardware state monitoring.

System Requirements

macOS 12.0 or later on Apple Silicon (M1/M2/M3/M4)

EmuTOS included. TOS 1.x, TOS 2.x and EmuTOS supported.

Download NoSTalgia 2.0 alpha 1 (soon)

News

10/01/2026

Version History

10/01/2026 - Version 2.0 alpha 1
  • Complete rewrite for Apple Silicon (M1/M2/M3/M4)
  • New Moira MC68000 CPU core with cycle-accurate emulation
  • Metal-accelerated video rendering
  • Native SwiftUI interface
  • Built-in NoSTalgia HDD driver (in ROM)
  • ACSI hard disk emulation with AHDI partition support
  • Top/bottom overscan support
  • YM2149 PSG with DMA sample playback
  • Mouse synchronization with GEM cursor
  • Keyboard joystick mode (arrows + A)
  • Built-in CPU debugger
  • EmuTOS included
03/06/2015 - Version 1.52
  • Fixed Midi via Quicktime
  • Bug fixes for Yosemite (10.10)
  • Fixed crashes with multiple bus error applications
  • Fixes for Spectre128, Aladin 3.0, Magic OS
24/04/2012 - Version 1.5
  • Intel version for Mac OS X 10.7 and 10.8
14/02/2004 - Version 1.4
  • Added Top/Bottom/Left/Right border support
  • Core Audio support
  • Hard disk driver is now free
  • EmuTOS support
  • Compatible with Panther (10.3)