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Please see Version 6.5 for detailed information on Platform 6.5 changes and Version 6.5 SP1 for updates in service pack 1.

Every ASCOM Platform release aims for 100% backward compatibility with current drivers and applications, providing an easy upgrade path and new capabilities that developers and enthusiasts can exploit.

If you would like to confirm the integrity of the installed Platform, the Diagnostics Tool will provide a wide ranging report through a comprehensive test suite that exercises every aspect of Platform functionality.

Major Enhancements in Platform 6.5

Alpaca Support

Alpaca devices can now be discovered from the Chooser, which will also create a dynamic driver so that the device can be used in any ASCOM client program. By default, Alpaca discovery is disabled but can be enabled through a new "Alpaca" menu option in the Chooser. This menu also enables you to manually create an Alpaca driver for devices that do not support automatic discovery as well as configure discovery and Chooser behaviour.

Further information on Alpaca use is provided here: Using Alpaca devices through the Chooser.

Device Hub

We now have a new "Device Hub" that replaces the ageing POTH, Pipe, Hub and Dome Control drivers. This provides improved functionality delivered in a modern technology that makes it easy to enhance if required. Thanks very much to Rick Burke for delivering this significant improvement!

CoverCalibrator Interface

Following an RFC we have added a new interface, ICoverCalibrator, which enables clients to control opening and closing of automated telescope covers and to adjust the brightness of flat field calibration panels. The interface incorporates these two distinct capabilities because some devices provide both within one hardware device.

Operating System Compatibility

Platform 6.5 requires Windows 7 or later together with .NET Framework 4.8. PCs running Windows XP should use Platform 6.4 Service Pack 1 together with .NET Framework 4 Client Profile instead.

Issues and Enhancement Requests

Please use the ASCOM forum: ASCOM Talk Forum at to report and discuss issues that you come across when using the ASCOM Platform. You will find the Diagnostics Tool located in Start Menu / ASCOM Platform 6 / Tools; it will help greatly if you run it before reporting an issue as it provides concrete evidence to help diagnose and resolve the problem.

  • See the section titled Version History for a summary of Platform 6 updates and new functionality.
  • See the section titled Version 5.5 for a summary of Platform 5.5 updates and new functionality.
  • This platform appears as ASCOM Platform 6.5 in the Apps and add/remove programs dialogues
  • The Platform has been tested in 32 and 64bit bit versions of Windows 7 and Windows 10.
See Also