I had the great honor to interview Lorenz Hanewinkel in his home office for two days. The 89 year old computer pioneer is one of the most important personalities in for the German IT development in the years 1955 to 1980. In the first part, Mr. Hanewinkel reports on his education and the time with Konrad Zuse. Anchor links: 03:22 Born in Heilbad Heiligenstadt 04:44 Crimes in the „Third Reich“ 06:18 Konrad Zuse's escape from Berlin via Göttingen into the „Allgäu“ 09:48 Hiring at Zuse KG for Z22 11:03 Alfred Eckhard leaves because of the Z22 tube calculator 12:20 Lorenz Hanewinkel finds tube radio 13:40 Studies not yet possible 14:36 Apprenticeship as a radio mechanic 16:11 Lineman over the winter 17:11 Study in record time 17:41 Konrad Zuses job offering at Aachen University 18:42 Z22 MINIMA concept with drum storage and ferrite core memory 23:24 Tasks of the tubes and the diodes 25:20 Diode network for the arithmetic unit 26:40 Floating point arithmetic exceptions in the basic program 28:37 Meetings with Konrad Zuse & what do customers want to do with the Z22? 29:52 Z22 finished in just under two years, was that difficult? 31:29 Function test of Z22 with pendulum calculation 34:10 The working atmosphere at Zuse KG 34:53 Zuse wasn't a good businessman 36:39 Production planning and problems 38:33 Production / development in the Neukirchen post-relay station and the company grows 43:12 The Zuse Z23, backward compatibility with the Z22? 44:16 The „Freiburger Code“ 46:14 Was the transition from Z22 to Z23 difficult? 47:13 Fritz-Rudolf Güntsch and the "G" bit for indirect addressing 51:44 Fritz-Rudolf Güntsch private stories 53:28 The engineering flat-sharing community in Hünfeld 54:37 Theodor Fromme with simultaneous chess and „Doppelkopf“ card game 55:50 Theodor Fromme gets a speeding ticket 56:24 Death of Theodor Fromme 59:05 Z25 manufacturing problems Links: - ZKM: https://zkm.de/de/person/lorenz-hanewinkel Recommended playlists: - Computer simply explained:    • Computer einfach erklärt   - Computer Museums:    • Computermuseen   - Contemporary witnesses of computer history:    • Zeitzeugen der Computergeschichte   Music used: - Groundwork (Kevin MacLeod): https://filmmusic.io/song/3832-groundwork