RTX 8.x Downloads

License Activation:

A valid Purchase Authorization Code (PAC) key is required to install RTX 8.1.2 or versions previous to RTX 8.x. If you have not received a PAC key, please contact your Sales Representative at sales@intervalzero.com.


RTX 8.1.2 Software Development Kit

No longer purchasable as of 12/31/2012

RTX 8.1.2 Runtime
RTX 8.1 Runtime
RTX 8.0 Runtime
Update 5 for RTX 8.1.2 Subsystem

12/7/2012 – This update to RTX 8.1.2 addresses numerous RT-TCP/IP issues, such as thread clean-up, ARP entry fixes, and Link Status support. Update 5 also includes all fixes found in the previous updates to RTX 8.1.2.

This will be the final update to the RTX 8.1 product version. As of December 31, 2012, you will no longer be able to purchase the RTX 8.1.2 SDK or Support & Maintenance.

Update 2 for RTX 8.1.2 Subsystem

2/11/2011 – This update to RTX 8.1.2 addresses an issue in which Service Request Interrupts (SRIs) appear to be corrupt. Ensures that interrupts disabled before a critical section is entered, are not enabled on exit of the critical section. Ensures that the RTX subsystem could run on 6-core systems that are running Vista with no service packs. Corrected a problem in which the wrong Rtdll can be unregistered by the rtsskill command. Update 2 also includes all fixes found in the previous update 1.

Update 1 for RTX 8.1.2 Subsystem

6/23/2010 – This update to RTX 8.1.2 corrects an issue where the proxy thread stack was corrupted. Stressing the system by creating and deleting thousands of Windows threads linked with rtapi_w32.lib, over a period of multiple days, produced this issue.

RTX 8.1.2 Visual Studio 6.0 C Runtime Update

12/11/2009 – This update to RTX 8.1.2 addresses a small block heap memory leak found in the RTX provided C Runtime libraries for Microsoft Visual Studio 6.0.

RTX Visual Studio 2008 Addin Update

12/11/2009 – This update addresses an issue with a corrupted call stack being displayed in the Microsoft Visual Studio 2008 IDE while debugging RTSS applications.

RTX 8.1 Service Pack 2 (8.1.2)

8/18/2009 – This cumulative release contains all the features of the previous updates. Along with support for Visual Studio 2008.

RTX 8.1.1 Stability Update

4/16/2009 – This release contains stability improvements to the loading and unloading of the RTX subsystem on XP systems. This update also contains additional functionality to set default behavior when devices are both MSI/MSI-X capable.

RTX 8.1 Service Pack 1 (8.1.1)

11/20/2008 – This cumulative release contains all the features of the previous updates, along with support for XP Service pack 3.

Cumulative Subsystem Update 2

10/2/2008 – This cumulative release contains all the features of the ‘Cumulative Subsystem’ update, along with a fix for RtDeleteTime being unable to correctly terminate handler threads waiting on an SRI. Improvements to defeating Intel Speed Step in RTX Shared mode. Optimizations to local memory and heaps access, and C Runtime updates for Visual Studio 6.0 and 2005 that allow for private heap handles to cross DLL boundaries.

Cumulative Subsystem Update

6/20/2008 – This cumulative release contains the new ‘Guard Page Update’ as well as the previous ‘IO APIC’ and ‘ProxyProcessProtection’ updates. The ‘Guard Page Update’ fixes performance problems that primarily affected Windows XP systems running on quad-core hardware platforms.

IO APIC Update

3/24/2008 – On APIC systems, an IST that is masking or unmasking its signal must perform two writes as one continuous operation before it returns. Returning midstream opens up the potential for another ISR to interrupt in between the operations, causing the wrong bit to be masked/unmasked or the wrong vector number to be manipulated.

Proxy Process Protection Update

2/26/2008 – When a Win32 application linked to RTX stresses system resources by repeatedly creating and destroying numerous threads, unstable conditions can arise in the form of a blue screen, green screen, or exceptions. The Proxy Process Protection patch provides additional protection for internal structures that resolves this issue.

RT-TCPIP Raw Sockets Update

2/22/2008 – This update provides fixes for RT-TCP/IP RAW Socket support.

Intel 82580 Driver

6/17/2011 – The IntervalZero RTX Intel 82580 standalone driver provides support for the Intel 82580 chipset. This installation adds the Rt82580 driver to the list of drivers that are automatically registered upon enabling the RT-TCP/IP stack. This stand-alone driver is compatible with RTX 8.1.2, RTX 2009, RTX 2009 with Service Pack 1, RTX 2009 with Service Pack 2, and RTX 2011. The driver was added to the RTX product as of RTX 2011 with Service Pack 1.

Intel 82580 Driver for RTX 8.1.2 Update 5

NOTE: To use this driver with RTX 8.1.2 Update 5, you must first update the driver source and rebuild. See the README, included in the zip file, for more information.

Intel 8257x Driver

3/25/2011 – The IntervalZero RTX Intel 8257x standalone driver provides support for the Intel 82576 chipset. This installation adds the Rt8257x driver to the list of drivers that are automatically registered upon enabling the RT-TCP/IP stack. This stand-alone driver is compatible with RTX 8.1.2, RTX 2009, RTX 2009 with Service Pack 1, RTX 2009 with Service Pack 2, and RTX 2011.

Intel 8257x Driver for RTX 8.1.2 Update 5

NOTE: To use this driver with RTX 8.1.2 Update 5, you must first update the driver source and rebuild. See the README, included in the zip file, for more information.

Marvell NIC driver

6/30/2010 – Support for the Marvell chip set. The RTX Marvell Driver supports a subset of the Marvell Yukon PCI Express Ethernet controllers. This stand-alone driver is compatible with RTX 7.1, RTX 8.1, RTX 8.1.1, RTX 8.1.2 and RTX 2009.