Author Archives: Lewis Rosenthal

Warpstock Europe 2025: A Huge Success!

If you weren’t able to attend or watch the live stream of the sessions at this year’s Warpstock Europe event in Amersfoort, The Netherlands, you should soon be able to watch the polished, post-production videos linked from the site. There was a lot of great information presented, and of course, a good deal of audience participation and discussion. In all, the event was a tremendous success!

There are currently two annual Warpstock events, run by two separate though coordinating entities: Warpstock, the original event, typically held in North America in the fall, sponsored by Warpstock Corporation, a US 501(c)3 non-profit organization, dedicated to educating users about the use of alternative operating systems; and Warpstock Europe, typically held in central Europe in the spring, sponsored by Stichting VOICE International, a Dutch non-profit entity.

If you’ve never attended a Warpstock event, the experience is unique. You get to spend time one-on-one with not only like-minded users, but with the developers shaping the OS/2 landscape and the engineers supporting it. There is plenty of time outside of actual classroom sessions to relax and exchange ideas, request improvements and new features, and to break out into smaller groups for ad hoc discussions.

The next Warpstock event is scheduled for Friday, November 7 through Sunday, November 9, 2025, in Little Rock, Arkansas, USA. Early registration is now open, providing a generous discount for those who register for the full conference before August 1. Once again, some of the Arca Noae staff will be on hand to present roadmap and how-to sessions, as well as others with various areas of expertise.

Dynamic Icons version 2.5.6 for ArcaOS released

Dynamic IconsDynamic Icons has been updated to version 2.5.6, and is now available 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. This update is available for 5.0 and 5.1 ArcaOS licensees with active Support & Maintenance.

Version 2.5.6 introduces a new caching scheme which essentially eliminates duplicated icons, significantly reducing memory overhead and dramatically improves desktop responsiveness. In addition, it is now possible to specify different icon size parameters for Tree and Icon views, a longstanding and often requested enhancement.

For those who rely on Dynamic Icons, this update is a must-have.

Many, many thanks to Rich Walsh for his hard work on this update.

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. Not sure what’s coming next? Have a look at our product roadmap pages.

Warpstock Europe 2025

Come join us at Warpstock Europe 2025 this weekend!

If you’ve never attended a Warpstock or Warpstock Europe event, these are truly unique and enjoyable experiences. This weekend, in Amersfoort, The Netherlands, Arca Noae Managing Member, Lewis Rosenthal, and Chief UI Architect, Alex Taylor will be on hand to present and answer questions regarding ArcaOS past, present, and future.

It’s not too late to register for the event. Visit the Warpstock Europe homepage for more information and to purchase tickets.

Lewis will provide the latest roadmap for ArcaOS 5.1, including highlights of development and planning for the 5.1.2 release. Alex will be discussing what it takes to create a localized ArcaOS version, and for developers, how to write or update existing applications to take advantage of some of the newer dynamic font sizing support in ArcaOS.

Getting a little more DOS headroom under ArcaOS 5.1

If you have installed DOS support under ArcaOS 5.1.x on a UEFI-based system, you may be able to gain another 64K or so of usable conventional DOS memory by disabling the Compatibility Support Module (CSM) in the system BIOS.

This 64K may be a game changer for applications using EMS, as conventional memory can run out of room for pointers to EMS locations. An example here would be Lotus 1-2-3 for DOS with a large spreadsheet.

It is also important to note that it may not be possible to disable the CSM on some systems, either due to BIOS restrictions or other system functions where the CSM is required for ArcaOS. However, in general, the Arca Noae Compatibility System (ANCS) should provide the necessary support for ArcaOS without the aid of the CSM. The good news is that if the system does not boot properly without the CSM enabled or if something doesn’t seem to function as expected, it can always be enabled again with no harm to the existing ArcaOS installation.

So, if you find yourself in need of just that little extra bit of conventional DOS memory, check the CSM setting in the system BIOS and see if you can disable it.

ArcaOS

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.

ArcaOS

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

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.