ACSI2STM Compact Hard disk emulator
The ACSI2STM is a compact storage adapter that connects directly to the Atari ACSI (DB19) port, allowing your Atari ST, STE, or Mega ST to use SD cards as hard disks. It replaces bulky, failure-prone vintage hard drives with fast, silent, and dependable solid-state storage.
Included:
- ACSI2STM Device flashed with the latest firmware version
Required (Not supplied):
- USB-C Cable and phone charger (For 5V Power)
- Micro SD Card
- CR2032 Battery (Optional) – if you want the device to keep a track of date/time
This device was designed by retro16. Please visit the GitHub site and read the documentation on how to use this device.
The ACSI2STM features DB19 gold pins for better conductivity. Please take care when plugging the device into the DB19 port as to not bent the pins.
ACSI2STM requires a minimum of TOS 1.04 (this applies to the older Atari ST/STF/STFM).
Please check your TOS version before ordering to make sure it will run on your system.
Additional Information can be found on the GitHub site and there are plenty of YouTube videos explaining how to use this device.
I’ve tested it on my Atari ST1040F computer with TOS 1.04
The last photo is a example of what it looks like with a SD card inserted.






