On my journey through the German computer collections, I naturally couldn't leave out the Deutsches Museum. In the fourth part, we look at the Zuse Z4, the world's first commercial computer with probably the world's first programming environment. Jump marks: 00:21 Introduction 00:43 Plan-Production-Device: the world's first Programming-Environment 01:02 Supported Operations of the Z4 01:38 Technical Data & first commercial Computer in the World 02:07 Setting up the Machine according to the Instruction-Manual 02:38 Control-Panel of the Plan-Production-Device 02:56 Keypad for Memory-Addresses 03:16 The "Error" Button 03:27 Scanners At-0 and At-1 04:05 Print-Commands D0 to D3 for Result-Registers 04:05 Output via "Mercedes Elektra" Typewriter 04:27 Mechanical Memory of the Z4 04:34 The "Plates" are missing in the Memory-Cage 04:59 Mechanical Memory-Interface to the Electrical-System 05:26 Arithmetic Unit wirth remote Signalling-Relay 05:57 Missing Stepping-elays 06:12 Output Unit with Glow-Lamps 06:31 Modern Input-Keyboard Left: - Homepage Museum: http://www.deutsches-museum.de/ - Info about the Film: http://www.holzheu.de/filme/dm/zuse-z4 - Blog about the Film: http://www.holzheu.de/zu-besuch-im-deutschen-museum Music used in the Film: - Embracing Technology (MusicLFiles): https://filmmusic.io/song/6849-embracing-technology - Technology Is Here (MusicLFiles): https://filmmusic.io/song/6842-the-technology-is-here Sources of information: - Zuse KG: Instruction manual Z4 (1952) Change log: 11.11.2020 First Version