Why update or upgrade to ArcaOS 5.1.1?

If you’re holding off upgrading from ArcaOS 5.0 to 5.1 or updating from 5.1.0 to 5.1.1, here are a few things to consder to get you off the fence.

ArcaOS 5.1.1, over a year and a half in development, incorporates over 50 improvements and refinements, from smoother installation and better integration with other operating systems to better stability and usability of the system. Here are a few points to consider from the changelog:

Now available in four languages (with more on the way): English, German, Spanish, and Russian. More comfortable computing in your native language? This is all made easier with ArcaOS 5.1.1.
For existing English installations, upgrading from 5.0 or updating from 5.1.0 could not be easier. Back up your system, boot from the installation media, select the option to update/upgrade, and select your existing installation from the list. The rest of the procedure is automatic.
Multimedia support has been upgraded and enhanced. Not only has the multimedia subsystem been translated to the system language, but if you have a CD collection and a modern PC, ArcaOS now handles digital transfers and supports the GnuDB CD track identification database.
Both remote control of the ArcaOS system and control of other systems from ArcaOS has been greatly enhanced with a new VNC server and client, supporting features found in UltraVNC, such as chat, file transfer, and encryption for web clients.
Of course we’ve also included the latest ACPI and updated device drivers for USB, video, mouse (new, major revision), FAT32 filesystem (for better interoperability and data exchange with other operating systems), and even a new keyboard driver for better operation on more hardware.

In short, 5.1.1 is the most stable, best performing ArcaOS release to date, and provides a truly modern OS/2 computing experience for PCs. It’s also quite at home in a virtual environment, running under Oracle VirtualBox or VMware ESXi or Workstation.

Best of all, for ArcaOS 5.1 licensees with active support subscriptions, the update from 5.1.0 to 5.1.1 is absolutely free. Let your subscription lapse? You can still renew and get the 5.1.1 release for no additional charge. Still running 5.0? Now is a great time to take advantage of the steep upgrade discounts offered to upgraders.

Arca Noae Managing Member, Lewis Rosenthal, to speak at Warpstock Europe 2025

It’s official: Arca Noae’s Managing Member, Lewis Rosenthal, is scheduled be live and in person at Warpstock Europe 2025 in Amersfoort, The Netherlands, May 16-18, to speak about Arca Noae, ArcaOS, new features in version 5.1.1, and future plans for the OS.

More information on this informative event is available on the Warpstock Europe website.

AMouse driver package v4.01 released

Arca Noae is pleased to announce the immediate availability of a new release of our AMouse driver package.

This is a major update with significant parts of the code rewritten. If you have ArcaOS version 5.1.1 then you already have this update. This update is now available for those who don’t have ArcaOS 5.1.1. The highlights of this update are:

Better handling of missing or emulated 8042.
Automatic mouse integration for VMware and Virtual Box.
Better handling of some PS/2 mice.
Better handling of some touchpoint devices.
Better NLV support.
Miscellaneous other minor fixes.

More information about the AMouse driver may be found in the wiki.

If you have ArcaOS, this driver package is available for download from the Arca Noae website as part of the Support & Maintenance subscription for your ArcaOS product. Please log into your account and see your ArcaOS order details page to access your software.

If you have an Arca Noae OS/2 & eCS Drivers and Software Subscription, this driver package is available for download from the Arca Noae website as part of your Arca Noae OS/2 & eCS Drivers and Software Subscription. Please log into your account in order to access your software.

If you are still running OS/2 and/or eComStation systems and haven’t yet purchased a software subscription, this is a great reason to do so now. It may also be a good time to consider moving up to ArcaOS.

Driver updates now available

MultiMac With the release of ArcaOS 5.1.1, several drivers have been updated. These updates are already included in ArcaOS 5.1.1, but if you are not updating to ArcaOS 5.1.1 you can still take advantage of some of the new driver updates. They are now available as part of the Support & Maintenance subscription for your ArcaOS product, and in the Arca Noae OS/2 & eCS Drivers and Software Subscription, Please log into your account and visit your ArcaOS Download Center to access your software. Specifically, these updated packages are:

USB 12.17 (updated from 12.16)
Panorama 1.20 (updated from 1.19)
ACPI 3.23.18 (updated from 3.23.17)
Multimac

These releases include minor fixes and enhancements over their previous versions, and while recommended, are not considered critical updates. Again, if you have ArcaOS 5.1.1, you already have all of these updates. Here are the highlights of what’s new:

USB 12.17

Enhanced USBMOUSE to handle more mouse features.

Panorama 1.20

Enhanced to select font size for ArcaOS installer.
NLV enhancements.

ACPI 3.23.18

Fixed acpidump to work on more systems.

MultiMac

Minor updates to E1000B 1.1.9, MMAE 1.1.9, MMRE 1.1.10, and MMJME 1.1.4

If you are still running OS/2 and/or eComStation systems and haven’t yet moved up to ArcaOS, this is a great reason to do so now. If you’ve already made the switch, but haven’t renewed renewed your support subscription, this is also a good time. Thinking of upgrading your current ArcaOS 5.0 installation? Now is also a good time.

If you have an Arca Noae OS/2 & eCS Drivers and Software Subscription, these driver package are available for download from the Arca Noae website as part of your Arca Noae OS/2 & eCS Drivers and Software Subscription. Please log into your account in order to access your software.

ArcaOS 5.1.1 now available

Arca Noae is proud to announce the general availability of ArcaOS 5.1.1 in English, German, Spanish, and Russian.

ArcaOS 5.1.1 continues to support installation on the latest generation of UEFI-based systems, as well as the ability to install to GPT-based disk layouts. This enables ArcaOS 5.1.1 to install on a wide array of modern hardware. Of course, ArcaOS 5.1.1 is just as much at home on traditional BIOS-based systems, offering enhanced stability and performance across both environments.

This release is free of charge to those with active ArcaOS 5.1 Support & Maintenance subscriptions, and there is no charge for requesting additional language ISOs (though your total number of ArcaOS 5.1 installations may not exceed the number of ArcaOS 5.1 licenses you have).

ArcaOS 5.1.1 can be used for new installs or to upgrade any prior English version of ArcaOS 5. If installing from USB stick, the USB install stick may be created using any major operating system at hand (Windows, Linux, MacOS, and of course, OS/2, eComStation, and ArcaOS). Once built, the USB stick can be inserted into any USB port in the target system to boot into the ArcaOS installer/updater in either UEFI or traditional BIOS mode (alternatively, the DVD image may be burned to physical media and also booted to either UEFI or traditional BIOS systems).

For a complete list of updates in this release, see the ArcaOS wiki. Be sure to review the README.TXT, as well, as this contains critical information to ensure that you get up and running fast, and includes tips for getting things adjusted right away.

This upgrade is available at a steep discount with your valid ArcaOS 5.0 Support & Maintenance subscription (and your remaining subscription time will be added to the included support term). To download your fresh ISO, simply visit your customer portal page and select the Download Center link on the navigation panel to the left. From there, click the “Upgrade to 5.1” button, and proceed to checkout.

If your ArcaOS 5.0 Support & Maintenance subscription has already expired, you may still upgrade at less than the cost of a new ArcaOS 5.1 license. Follow the procedure above to order your upgrade, and the discount will be reflected in your cart.

New ArcaOS 5.1.1 license purchases are initially built as English. To request a different language, simply visit your Download Center, select the Build ISO Again button, and choose your language.

Need more convincing? How about a commercial operating system which doesn’t spy on you, does not report your online activity to anyone, and gives you complete freedom to choose the applications you want to use, however you want to use them? How about an operating system which isn’t tied to any specific hardware manufacturer, allowing you to choose the platform which is right for you, and fits perfectly well in systems with less than 4GB of memory or even virtual machines?

Arca Noae is committed to continuing the development, support, maintenance, and refinement of the OS/2 platform. The next release of ArcaOS is already in the works. The future looks bright for Arca Noae and ArcaOS!

Server status update for February 14, 2025

Currently, email and our bug tracker are experiencing considerable traffic load. This includes subscription renewal notifications, new ISO download notifications, as well as incoming contact submissions from our contact page.

We are working to mitigate the flow of non-legitimate traffic, and will post an update when the matter has been resolved.

Downloads of subscription content should not be impacted in any way.

ArcaOS named Best Alternative OS of 2025 by TechRadar!

It is always gratifying to receive acclaim from our peers and the educated press. It seems that TechRadar has listed ArcaOS as #1 in their list of Best alternative operating systems of 2025, albeit with some slight misstatements in their overview (which we have brought to their attention).

One of the points which is specifically incorrect is the negative notion that ArcaOS is “for older PCs.” ArcaOS 5.1 should install on many or most new or recent Intel or AMD-based hardware. It is capable of booting on UEFI-only systems, without the aid of a CSM, using our proprietary 64-bit UEFI loader, and then booting ArcaOS (which itself is 32-bit) just as it would on a traditional BIOS system.

ArcaOS 5.1 also supports booting from GPT partitioned media, making it a great companion OS for multiboot configurations where the disk (or SSD) has already been partitioned this way and where it may be impractical to wipe and convert to MBR-style partitioning.

In fact, it is also something to note that ArcaOS is specifically not intended for use on “older” hardware, such as ISA, EISA, or MicroChannel, as most of the device drivers for those architectures were removed from ArcaOS prior to its initial release.

Another misstatement in the article pertained to pricing which quoted figures for licensing of the 5.0 release which itself is no longer available (though support for 5.0 continues with no stated EOL). Also, if you already have an ArcaOS 5.0 license, generous upgrade discounts apply should you want to move up to ArcaOS 5.1.

EAMaster has been updated to v1.2.1 with even more new features!

Following onto the October release of last year, Keith Merrington has again updated his handy EAMaster utility to v1.2.1. This latest build now includes three new tools:

A tool to examine hold files produced by the EAUTIL OS/2 command or by EAMaster.
A utility to search and optionally correct duplicate or incorrect long name.
A utility to compare the EAs between directories.

If you already have a license for EAMaster, simply download the latest version (which should be available on Hobbes) and install to upgrade your current installation. Your existing registration will be recognized, and you’ll be good to go immediately.

If you don’t yet have a license, please visit our store for more information on this extremely useful package.

eCo Software Runtime packages updated to 20241129

Arca Noae is pleased to announce the availability of updated eCo Software Runtime packages, downloadable from our downloadables page.

The eCo Software Runtime packages provide support libraries for several components of ArcaOS and eCS, as well as eCo Software applications. The Base, Net, and Win packages have been updated as of 2024-09-15 (Base) and 2024-11-29 (Win).

The eCo Software Runtime Toolkit has also been updated with this release.

More information on these packages may be found on the developer’s site.

These packages are provided by Arca Noae as a convenience to our customers, clients, and the community at large. Arca Noae does not produce these packages, and the software is provided “as is” without any warranty of any kind. Support for the eCo Software Runtime is provided by eCo Software, in their support forum.

Considering new hardware for ArcaOS?

If you are thinking about a new computer, you may be wondering if a new system will run ArcaOS. Most modern hardware will run ArcaOS just fine. But if you want to know more, Arca Noae has some resources to help.

We have a wiki page with quick information about Choosing a System for ArcaOS. We also have a list of a few systems that we have tested on our Tested Hardware page. Don’t be discouraged if the system you are considering is not on the list of tested hardware; we can’t test everything, and new systems are being released all the time. Additionally, you might want to try looking at some of the information available in the OS/2 World wiki (note: Arca Noae is not affiliated with OS/2 World).

If you have access to the new computer (or an identical model on display at a local retailer), and it is a UEFI system, we have a System Evaluation tool that may help with your decision. The System Evaluation tool is available on your ArcaOS install DVD or USB stick, and also as a separate stand-alone tool. To use the System Evaluation tool you don’t need to install anything, ArcaOS is not required, and you don’t need an ArcaOS license for the stand-alone version. You can download the stand-alone System Evaluation tool here and follow the directions to add it to a FAT formatted USB stick. Note that the stand-alone version is probably newer than the one on the ArcaOS install medium.

In order to boot to the System Evaluation tool, it will be necessary to disable Secure Boot if it has been enabled. Many display systems at retail stores run in a “kiosk mode” which sets Secure Boot, disables access to the BIOS settings, and may also disable access to USB ports. When unsure, ask a sales clerk for assistance (and be sure to introduce him or her to ArcaOS!).

The System Evaluation tool cannot guarantee that a given system is capable of running ArcaOS to its fullest potential, but it should be able to assist in at least ruling out systems where it cannot detect known, supported hardware devices. It should also be able to provide a good estimate of the amount of memory which will be visible to ArcaOS below the 4GB boundary (you might want to avoid systems with extremely low memory headroom).

Happy testing!