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A new time module on sale in a few days

IMG_1639I have found another Time Module. This time, it comes with manual in good shape and quick reference card, both in English.

It will be put on sale at the price of 150€. If you’re really interested and want to get it, please send me a mail to

Those of you that have a HP41cx don’t need it - this model came with it. Bot for the other owners of a HP41C, it is probably the most significant module - together with the advantage pac. And if you have paid a lot of money for a HP41CL, you deserve to have the full Monty.

The legend tells that the time module was developed under NASA requirements, so that the Columbia shuttle astronauts could have a calculator that could substitute the Shuttle computer, “just in case”. One of the programs that was installed (and that would require the likes of a time module) was used to search for the right ground station to send data or receive communication from. I have heard also of programs to calculate the best orbit exit routes - also requiring accurate timing. But sources did not agree on whether these programs had been loaded “just in case” or the calculator was really used for number crunching and actually relieving the main calculator from some tasks.

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