ACSI2STM hard drive emulator for Atari ST (STF, STE, MegaSTE...).

Latest firmware version 5.00 (Nov - 2024). Better and faster

It is a hard disk emulator for Atari ST (STF, STE, MegaSTE...) based on ACSI2STM project.

The mode GemDrive is working on TOS 1.04, 1.60, 1.62 and 2.06

The mode ACSI is working on all ST, STF, STE, Mega and TT (TOS 1.00, 1.02, 1.04, 1.60, 1.62, 2.06 et 3.x)

For Mega STE and TT, Beware the carte is sitting in front of the VME slot.
For Mega STE, the GemDrive may not work in the 16Mhz mode is enabled.


It plugs into the machine's external ACSI port. In GemDrive mode, a microSD card formatted in Fat32 can even facilitate the transfer between PC and Atari. Even large SD like 16Gb or 32Gb will work just fine.

There 3 SD card slots. you could have first microSD in GemDrive mode and the 2 other in ACSI mode working together.
A CR2032 battery allows you to save the time and date.

The card is all ready to use. You just need an SD card and a USC type C charger.
Professional built.

A QR code will give you the link to documentation and resources to use the card. You can also download ICD driver, microSD images and STL files to print you own case (see last photos)


The project being open source, all the information is available here on the GitHub [search acsi2stm retro16]


SD cards, CR2032 and case not included in the sale.

Contact me for more details or for to buy bundle.

Will be well packed in an antistatic bag