SIO2SD – Mass storage for Atari XL/XE by Lotharek

109.00 207.00  Tax included

Items Sold: 17


SIO2SD Revised 2k20 – Mass storage for Atari XL/XE


Hardware, manuals, FAQ, and other info on manufacturers website – HERE

SIO2SD is a device that allows you to load games/applications to 8-bit Atari computers via an SIO interface from SD/MMC cards.


  • Works with SD/MMC (FAT12, FAT16, and FAT32 formats
  • Handles ATR (rw), XFD (to), and COM/XEX (ro) file types
  • 16×2 LCD display allows to browse the catalog tree and choose files to load
  • Handles SIO with turbo (allows to set speed index from 1 to 16, default is 6 (69kb/s), in versions 1.x speed index was always 10 (51kb/s))
  • All densities with 128B and 256B sectors, including 16MB disks
  • Handles drive d1 to d8 (up to version 1.2 only d1 to d4 drives were available)
  • Can be configured using ATARI (it’s possible to load configuration tool directly from MCU flash memory, so no SD card is needed)


  • Hirose heavy-duty SD SLOT (push-pull), used in HXC Floppy Emulators
  • polarity protection with indicators led (OK/NOK polarity)
  • extra keys and LEDs connectors for customers that fir device inside case/atari/etc


  • FAT formatted SD card needed
  • In the root directory, create ATARI folder. Here you can place folders and files. This is the start folder for SIO2SD. It’s a better idea to use folders with up to about 100 files than one big folder with many, many files.
  • On the first use of a newly formatted card, SIO2SD will create a SIO2SD.CFG file in the root directory, where the configuration will be stored (files to disks mapping).
  • Note: the directory named ATARI must be present on the card or else SIO2SD won’t recognize the card and won’t perform the upgrade.


  • K1: next Atari drive (D1, D2,..)
  • K2: next file/folder
  • K3: parent directory (cd ..)
  • K4: go to folder/map file to current Atari drive
  • SHIFT+K2: firmware upgrade
  • SHIFT+K4: turn off current Atari drive (“eject disk”)



  • SIO high speed
    • off
    • hs index from 1 to 16 (6 is the default setting)
  • CFG tool load (when to override D1 to load configuration program)
    • never
    • startup+shift – only when SHIFT was pressed during startup (power on)
    • every startup
    • no card – only if SD card is not inserted (default setting)
    • shift pressed – SHIFT always causes D1 override (tested on every SIO ‘S’ command on D1 – available from version 2.2)
  • LED mode
    • SD read/write – first LED shows SD reads, second LED shows SD writes
    • SIO read/write – first LED shows SIO reads, second SIO writes
    • SD act/SIO act – first LED shows any SD activity, second any SIO activity
  • Device id (number of the device for SIO2SD.XEX – available from version 2.2)
    • values from 0 to 3
  • Write-protect (write protection in ATR files – available from version 2.2)
    • never – ATR’s are always R/W (write protect flag ignored)
    • obey ATR flag – obey ATR write protect flag – default
    • always – ATR’s are always R/O

Additional information

Weight 0.25 kg
SIO Cable

With SIO Cable, No SIO cable

SD card with software

With SD card, No SD card