Thanks to Dan at hpmuseum.org’s forum, here’s a significant addition to this blog. The HP-41 was used by german astronaut Ernst Messerschmid for importing voltmeter readings in Spacelab D1.

Spacelab D1

Spacelab D1

Here’s the text from Deutsches Museum:

D1-SPACELAB Mission, 1985
Walcher Elektronik GmbH, Kirchheim, 1985
Hewlett-Packard, USA, 1984

The voltmeter is an instrument for measuring voltage and temperature. It contains an analog-to-digital converter that feeds the measured values to the calculator for processing. The calculator is a slightly modified standard HP 41 calculator.

Astronaut Ernst Messerschmid devised this voltmeter to be used for experiments in materials science aboard the 1985 German D1 mission.

Actual Spacelab D1 HP-41CX

Actual Spacelab D1 HP-41CX

Handwritten HP-41CX program listing and diagram

Handwritten HP-41CX program listing and diagram

Ernst Messerschmid

Ernst Messerschmid

Additional pictures taken by Dan at the Deutsches Museum:

Deutsches Museum HP-41CX exhibit

Deutsches Museum HP-41CX exhibit

Deutsches Museum HP-41CX exhibit

Deutsches Museum HP-41CX exhibit

Deutsches Museum HP-41CX exhibit

Deutsches Museum HP-41CX exhibit

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