Atari ComputersA personal computer history

Atari ST / A sixteen-bit workspace

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Sixteen bits.

Start ST BASIC, explore the desktop, or load a floppy image. This Atari 1040ST emulator runs locally in your browser with 1 MB of RAM and EmuTOS.

Start your Atari ST

Press Start Atari ST. The included disk launches ST BASIC automatically after booting. Click the emulator screen to use your keyboard and mouse.

Open ST emulator in its own tab ↗

Try ST BASIC

Click in BASIC’s command window, type each line, and press Return. Enter RUN to execute the program.

10 PRINT "HELLO FROM ATARI ST!"
20 FOR N=1 TO 5
30 PRINT N
40 NEXT N
RUN

More about ST BASIC, GFA BASIC, and Omikron BASIC →

Load a floppy

Disk A and Disk B accept ST and MSA floppy images from your computer. After selecting a boot disk in A, press Reset. Your files stay in your browser.

Reload this page to return to the included BASIC startup disk. Reset restarts the machine with the currently selected disks.

Controls and compatibility

Use a physical keyboard and mouse for the best experience. Use Realign mouse or middle-click if the pointers drift. For GFA BASIC, use GFA Break or Control + Shift + Option on Mac (Ctrl + Shift + Alt on PC). Enable the joystick checkbox to use the arrow keys for directions and Ctrl for fire. Press Tab to move from the screen back to the controls.

Sound starts muted; use Sound: off to enable it. Fullscreen enlarges the display; Escape returns to the page.

Disk changes cannot be saved. Treat this emulator as a place to try programs, rather than the only copy of your work. Some games and demos need original TOS or more accurate hardware emulation than EstyJS provides.