ArcaOS


ArcaOS is an operating system developed and marketed by Arca Noae, LLC derived from OS/2, based on the last release by IBM. Development continues with a stated goal to add wider compatibility for more modern computing platforms, including UEFI and GPT support. It has limited PAE support and utilizing its SMP kernel, supports up to 64 physical CPUs or real CPU cores.
ArcaOS is a 32-bit operating system that runs on the x86 processor architecture. ArcaOS is based on IBM's OS/2 Warp 4.52. As of version 5.0.4, ArcaOS is ACPI 6.3-compliant to ACPICA 20200110.

Compatibility

Hardware

ArcaOS is compatible with most x86-based personal computers, including portables, desktops, and servers that have the availability of a traditional BIOS or, in the case of UEFI-based systems, a complete CSM.
ArcaOS includes device drivers for a number of network adapters, either using Arca Noae's MultiMac technology, which employs FreeBSD driver code, older IBM and third-party-supplied drivers, or a selection of GenMAC drivers. Support for wireless networking is somewhat limited, though MultiMac support for select chipsets is planned.
ArcaOS supports USB 2.0 and 3.0 connectivity.
Most audio support utilizes the Uniaud generic audio driver, now maintained by Arca Noae. Uniaud is based on ALSA. In addition, a selection of device-specific drivers are included with the OS distribution.
Video support is provided by Panorama generic unaccelerated VESA driver, or SNAP accelerated video driver. While acceleration is supported for a limited number of graphics chipsets, and other features such as zooming and multi-head are also available for a limited number of chipsets, SNAP lacks support for many modern chipsets.
Storage drivers are available for IDE and AHCI, and a select number of SCSI adapters are supported. An NVMe driver is not yet available.

Software

ArcaOS includes a capable DOS VDM, and ships with a modified version of Windows 3.11, WinOS2, capable of running 16-bit Windows applications. It is also capable of running some 32-bit Windows applications utilizing Odin. In addition, ported Linux applications are quite common, as well as some Qt applications. While some of these ported Linux and Qt applications are included with the distribution itself, more of these may be installed as RPM packages from several available YUM repositories. OpenJDK 6 is included and ArcaOS is capable of running a wide range of Java applications.
A Heimdal Kerberos authentication client is included in the ArcaOS distribution, based on the 7.6.0 Heimdal code.

Filesystems

ArcaOS's native file system is JFS, though HPFS is also supported. FAT12, FAT16, and FAT32 are also supported using either the kernel's own FAT driver or an IFS driver.
ArcaOS supports several other file systems through the use of additional IFS drivers, such as CDFS and UDF.
NetDrive for OS/2 provides access to Samba 4 shares via its own IFS driver. The ArcaOS distribution includes a limited license version of NetDrive but the fully licensed version is capable of mounting a number of other local, native, and foreign file systems.

History

Origins

ArcaOS was formally announced on October 23, 2015, at the Warpstock 2015 event under the code name "Blue Lion" by Arca Noae's Managing Member, Lewis Rosenthal.
Some of the planned features for Blue Lion announced at the time were:
At the Warpstock 2015 conference, the initial release was projected for late third quarter of 2016, but Arca Noae also stated that no actual release date had been set. No pre-orders for ArcaOS were ever taken or announced.
The name "ArcaOS" was first published in a Tech Republic article on May 26, 2016, while the arcaos.com domain was registered December 20, 2015. In the same Tech Republic article, Lewis Rosenthal was quoted as saying that the first release of ArcaOS would be version 5.0, as it follows onto the last release of OS/2 Warp from IBM, which was 4.52. He also stated that ArcaOS 5.1 will provide French, Spanish, Italian, German, and Dutch versions of the operating system.

Version 5.0.0 - First release

ArcaOS 5.0 was released May 15, 2017. The Register published an article about the release on May 19th, 2017. There were two editions released: a commercial edition, intended for enterprise use, and a personal edition, targeted at non-business users at a reduced price. Pricing was listed as $229 per license for the commercial edition, and $129 per license for the personal edition, with $99 promotional price in effect for the first 90 days following release.

Release 5.0.1

On 9 July 2017, ArcaOS 5.0.1 was released. It contained fixes for the installer, and Arca Noae's most current drivers. The AHCI driver was updated, along with Multimac and a fix for VirtualPC to use IBM’s SMOUSE driver.

Release 5.0.2

In version 5.0.2 ArcaNoae added USB booting support, allowing OS/2 to boot from USB media in addition to optical media. Version 5.0.2 was released on February 10, 2018.

Release 5.0.3

On 19 August 2018 version 5.0.3 was released. It included several updates to the bundled drivers and programs.

Release 5.0.4

On 21 July 2019 version 5.0.4 was released. It introduced a new Updater feature, allowing ArcaOS installations to be updated to the latest release without reinstalling the operating system.

Release 5.0.5

On 6 June 2020 version 5.0.5 was released. In addition to bug fixes and updates, it added support for xHCI/USB 3 controllers.