Release Notes and Instructions: The Temma PC system relies on the polar alignment of the mount for goto accuracy. Simple applications such as planetarium slewing are more likely to work than demanding automation applications. Many astronomy programs now support an independent system of interoperable telescope drivers called ASCOM. Details on the revised Software Bisque Temma driver can be found here. This is a full-featured driver that provides not only ASCOM standard driver functions, but also user access to many of the Temma’s special features. Please go to the Astro-Physics Driver web page for their driver and associated software.

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The SynScan Hand Controller version must be 3. For details see Takahashi Japan’s Temma 2 technical report.

ASCOM Temma Telescope Driver (free) download Windows version

It is important use the revised Software Bisque Temma driver included with build and later rather than the version of the driver included with the TheSky V5 build 44 through Then you can use whichever driver suits your needs. It is available here: Latest firmware is recommended but will run with old firmware backwards compatible with reduced features.

Goto was always within 5 arc-min and typically within 2 arc-min. This is an ongoing project, so be sure to check the site for updates. See the help file and release notes! It should also work with TheSky6 and TheSky5 but not all functionality will be present. This driver does NOT support Synta mounts.


Temma by Takahashi ASCOM Driver

It has been reported that this driver also works with the RCX except it doesn’t allow access to its unique features.

The latest TheSky build is available here. The EM Temma PC Jr fits this bill primarily because it combines the precision features needed for imaging with light weight needed for portability the head weighs 24 lbs.

I measured goto accuracy using my EM with a just good polar scope alignment no drift alignment and a Vixen GA4 illuminated guiding reticle.

The Takahashi mounts do not support PEC training. The driver has also passed the Conformance Checker tests see this report.

The EM is an open-loop system meaning that it will lose goto sync once the clutches are released. The Temma PC system design is quite straight forward and flexible and should be easily supportable in the future with any needed drivers. The button leads to David’s web site for this driver as well as other info on DSCs.

Provides position readout, slews, side of pier where appropriateand pulse guiding among its teoescope capabilities. I chose this mount as part of an “ultra-portable” imaging system.

As for value, that’s harder to deterimine. That driver was problematic. But this is not useful for long exposure imaging.

Like any goto system the mount can be resyncrhonized as you go on. The hand paddle attached to the mount still works when the mount is connected to the PC. This version has passed the Conformance Checker tests and has support for programmably changing pier side. But its database is quite limited and it is missing many features that anyone used to TheSky will sorely miss.


This is a full-featured driver that provides not only ASCOM standard driver functions, but also user access to many of the Temma’s special features. Most typically the mount must be polar aligned it is generally agreed that Tak polar scopes work very wellthe goto system is then synchronized with one star and that’s it. The advantages of the Software Tellescope driver over the Unofficial Temma PC Driver are 1 the Software Bisque driver supports alternative tracking speeds including solar and comet tracking rates; 2 the Software Bisque driver supports fine movement controls from within TheSky my driver can only support the Jog movement command ; 3 the Software Bisque driver automatically gets the Site Location information from TheSky.

Previously you felescope to purchase Software Bisque’s Orchestrate to get this functionality.

Software Bisque developed and is now including their own revised Temma driver for TheSky V5 build and later. Details on the revised Software Temma Temma driver can be found here.