• Support for the new streamer device type SCTP. As image files .tar files are supported, like they are read/written by the tar command line tool. Furthermore, mt/ mtx and the streamer software Gemar for the Atari are supported. Support for SIMH-compatible .tap files is a work in progress for SCSI2Pi 4.1.
• Support of linked SCSI commands according to the SCSI standard.
• Numerous logging and error handling improvements.
• The in-process test tool is now included in the binary packages.

The installation or the update with the binary packages for 32/64 bit bullseye/bookworm is a matter of seconds.
Note that the PiSCSI web UI only offers limited support for device types it does not know, like the SCTP type. The SCSI Control App offers full support.

• The SCSI-1 compatibility mode has been improved.
• A minor bug in the s2p parser has been fixed.
• A bug in the s2pexec timeout handling has been fixed.

The installation or the update with the binary packages for 32/64 bit bullseye/bookworm is a matter of seconds.

• s2pctl displays "????" instead of nothing for unknown device types.
• A minor issue when dealing with file operation errors has been fixed.

• A bug when reading CD images has been fixed (ticket #92).

• Code optimizations for the FULLSPEC board.
• The comparatively less performant legacy boards (aibom and gamernium) are no longer supported.
• Code quality improvements.

• Building tailored optimized binaries with a selection of device types has been simplified.
• Various code optimizations.

• The current configuration can be saved as properties in /etc/s2p.conf with s2pctl or the SCSI Control App.
• SCSI and SASI devices can share the bus.
• Logging the bus signals with s2pexec and in_process_test, resp., is now optional.
• The binary sizes have been reduced even more (compared to PiSCSI by about 25%), which is especially important for small Pis (Zero/Zero 2). The less memory is used the more is available for the sector cache.

• Minor bugfixes in the property evaluation/display.

• The automatic creation of the PiSCSI bridge for the DaynaPort emulation can be switched off.
• s2p automatically switches to a matching caching mode if the SCSI commands READ/WRITE LONG are used.
• Numerous optimizations and even more compact binaries.

• Further increased transfer rates, especially with small Pis. With a Pi Zero W the transfer rate is now about 25% higher than before.

• During the installation a configuration file /etc/s2p.conf is created, if not yet present. Edit this file where needed, and subsequently restart the SCSI2Pi system service.
• A bug in the language detection for error messages has been fixed.

• The programs installed with the binary packages or with sudo make install can be launched without sudo.
• The assignment of file extensions to device types is configurable.
• The SCSI level is configurable.
• As sector size any multiple of 4 is supported, which improves the compatibility with exotic platforms.
• The READ/WRITE LONG implementation has been extended and covers more use cases.
• s2p supports various caching modes.
• The DaynaPort emulation supports Wifi also with Bookworm.
• With the "-P" option s2pctl displays the current s2p settings. These can directly be used for a properties file like /etc/s2p.conf, making setting up a default configuration even easier.
• s2pexec supports an interactive mode and offers improved scripting capabilities.
• s2pexec accepts data for the DATA OUT phase on the command line.

• The installation automatically creates a system service for s2p.
• A potential timing issue has been fixed.
• s2pctl now displays a correct error message when setting an invalid default folder location.
• A bug in the printer emulation has been fixed.

• Properties and property-files make configuring s2p more convenient.
• User-defined mode pages improve the compatibility also with exotic platforms.
• BlueSCSI compatibility mode for the names of image files.
• All tools support easier to memorize long command line options.
• s2cptl offers an interactive mode and supports scripting.
• s2pdump can generate information on devices and mode pages for property files.
• s2pdump supports backup/restore of SASI hard drives.
• s2pexec can send any SCSI command, including the command parameters.
• New tool s2pproto for testing the custom SCSI commands of the host services.
• Improved logging.

• There are now installation packages for 32 bit bullseye/bookworm and 64 bit bullseye/bookworm.

• Fixed a bug in the remote interface for clients (e.g. s2pctl, SCSI Control app).

• The DaynaPort emulation uses a dynamic MAC address. This prevents collisions of several DaynaPort emulations in the same network.
• The extensions .cdr and .toast are treated like the .iso extension (for CD-ROM images).
• Further improved compatibility by supporting the mode pages 2, 7, 10 and 12, and by an improved MODE SELECT error handling.
• s2pdump supports an optional start sector and a sector count. Now also parts of a drive can be dumped/restored. See the manpage for details on the new options.