The SCSI Hard Drive Emulator for retro computing.
- downloads for v3/v4/v5 hardware revisions.
- downloads for v6 hardware revisions. This firmware will NOT work on the older boards.
[2 April 2017]v6.1.0 Bugfix release
- Enable sync transfers on SCSI1 hosts
- Support 4MB/s sync transfers for Amiga A590 (WD33C93)
- Merge v4.7 release changes
[12 March 2017]v4.7 New firmware
- Fix bug in SCSI Inquiry command for SCSI2 hosts
- Added OMTI host quirks mode
- Fix for booting from early Mac Plus ROMS
- Performance fix when SCSI2 mode is enabled. Some users may need to disable SCSI2 mode if it was incorrectly enabled previously.
- Added support for configurable mode pages
- Fix for exporting selectionDelay/startupDelay parameters to XML via scsi2sd-util
- scsi2sd-util is now built with libudev1 on Linux, as all distros have moved to this version. Users on older Linux distributions will need to compile from source.
[7 October 2016]v6.0.13 Bugfix release
- Added glitch filter to SCSI signals
- Restored parity-checking option (defaults to disabled)
[12 January 2016]v4.6 New firmware
- Fixed bug when using sector size that isn't a multiple of 4 (eg. 522 bytes)
- Fixed a bug that caused hanging or scsi phase errors on high speed scsi hosts.
- Fixed a hang when processing a SCSI RESET in a data phase.
- scsi2sd-util: Fixed USB connection problems under Windows 10.
- Added option to treat luns as separate devices
- Improved boot up time. It is now possible to replace the bootloader with a version that doesn't pause for 2 seconds (bootloader). This is required on some Amigas and the Staubli JC5. Replacing the bootloader CAN BRICK YOUR DEVICE if it fails half-way, so do not attempt this unless necessary.
SCSI2SD is an emulator for old SCSI hard drives. It allows replacing one or several old broken SCSI drives with a SD memory card.
Which version should you buy ?
|SCSI2SD V5||This is the stable version, with the widest compatibility. Most people should buy this version. It works well with both SCSI1 and SCSI2 systems.|
|SCSI2SD V6||This board offers better performance, but is less compatible.
|SCSI2SD for Powerbook||Designed for Apple Powerbook laptops using 2.5" drives.|
The new V6 board and 2.5" PowerBook version are available at:
The 3.5" boards are available from the following distributors:
3rd party accessories
- durhamcardco.com Internal faceplates for V5 and V6 boards, and external V5 case.
- Thingiverse nibblernibbles has created a 3d-printable external enclosure for the SCSI2SD + DB25 adapter. Power can be supplied over USB for hosts which don't supply termination power.
- SCSI2SD V5 & V6 Bracket by Maya Designs
- In-built active terminator.
- Emulates up to 4 SCSI devices (7 for the V6 version)
- Supports sector sizes from 64 bytes to 8192 bytes
- Firmware updatable over USB
- Highly configurable over USB
- Selectable SCSI ID
- Selectable parity support
- Enable/disable Unit Attention Condition
- Artificial limits on the SCSI disk size (eg. limit size to 4G to avoid OS bugs)
- Sector size (can also be set via the SCSI MODE SELECT command, as sent by SCSI format utilities).
- External LED connector.
|V5 hardware||V6 hardware|
|SCSI Interface||SCSI-2 Narrow 8-bit 50-pin connector.
Supports asynchronous transfers only.
|SCSI-2 Narrow 8-bit 50-pin connector.
FAST10 (10MB/s) synchronous transfers.
|SD Card Interface||microSD, tested up to 64GB
Communication is via the SPI protocol at 25MHz (3MB/s theoretical max)
|Full-size SD, tested up to 32GB|
Up to 20MB/s
|USB Interface||Firmware updates and configuration
USB 2.0 micro-B
|Firmware updates, configuration, and mass-storage
USB 2.0 micro-B. Mass-storage at USB 2.0 FS speeds (1.2MB/s max)
|Power||5V via standard Molex 4-pin drive connector, USB, or self-powered using the SCSI host termination power.
2.35W maximum (500mA)
DO NOT CONNECT 12V at all if you need to make your own power cable as it risks destroying the board if you accidentally swap the wires.
|5V via floppy 4-pin drive connector, USB, or self-powered using the SCSI host termination power.
2.35W maximum (500mA)
|Dimensions (L x W x H)||5cm x 10cm x 1.5cm||10cm x 9cm x 1.5cm|
Tested under optimal conditions. For comparison, here are some benchmarks of some older SCSI hardware.
|Up to 2.6MB/s read, 2.3MB/s write.||Up to 10MB/s.|
Firmware update utility and configuration tool at:
These files are currently available for Windows, Linux, and Mac OSX.
A copy of all sources can be obtained via the command:
git clone --recursive git://www.codesrc.com/git/SCSI2SD
or (for V6)
git clone --recursive git://www.codesrc.com/git/SCSI2SD-V6
- SCSI2SD FAQ
- SCSI2SD UserManual
- FormatWithBasiliskII Format an SD card for use with Apple Macintosh hardware using the Basilisk II emulator
Alternative Open SCSI Projects
- AJ's alternative implementation. AJ and I originally had a competition to design and build a SCSI device to boot an old Mac LCIII. The deadline for that competition has long-since expired without a winner, but we have both continued to progress our designs.
- S2I (was: SCSI2IDE)
- AVR based SCSI RAM disk
For historical project information see SCSI2SD old