acsi2stm Atari ST ACSI hard drive emulator

Hard drive emulator for your Atari ST using an inexpensive STM32 microcontroller and a SD card.

The aim of this project is to be very easy to build, extremely cheap, reliable and safe for your precious vintage machine.

The module supports up to 5 SD card readers, showing them as 5 different ACSI devices plugged in.

It can work in 3 ways:

• Expose a raw SD card as a hard disk to the Atari.
• Expose a floppy or hard disk image file on a standard SD card to the Atari.
• Mount a standard SD card on the Atari.

It also provides an UltraSatan compatible real-time clock if you add a simple 3V lithium battery such as a CR2032.

The doc directory provides documentation for the end-user as well as hardware implementors or curious people.

This is what you can find:

• manual.md: A brief user manual for people owning a unit.
• flashing.md: A tutorial on how to download and flash a firmware into a STM32. For first time users or for upgrading a pre-built unit.
• compiling.md: A step-by-step tutorial to compile and customize a new firmware. Describes compilation options.
• pcb_manual.md: User manual for the official PCB.
• build_pcb.md: Instructions for building a unit using the official PCB.
• hardware.md: How to design and build an acsi2stm unit from scratch (hand wired, or your own PCB design).
• gemdrive.md: Technical details about GemDrive.
• protocols.md: Technical details about the communication protocol between the ACSI2STM unit and the Atari ST.
• troubleshooting.md: Having problems? Have a look in here.

Visit to GitHub for firmware

Read manual from François Planque’s Archive ACSI2STM on Mega STE: backup of internal HD