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     Dr.(Phys.)Dipl.-Ing.Ralf-Udo Hartmann

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5. RobertCharf   (01.Feb.2018 11:46:50)
I am fascinated. I do not think I've met anyone who understands just as much about the topic. You need to make a career of it, really, great site

4. DannyRzSibly   (18.Mar.2017 2:59:23)
Hello. And Bye.

3. ScottcholF   (04.Feb.2017 12:35:55)
Just want to say your article is as surprising. The clearness within your post is merely nice and i can assume you are an expert on this topic. Fine along with your permission let me to grab your RSS feed to maintain updated with forthcoming post. Thanks a million and please carry on the enjoyable work.

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2. Francois Rautenbach [frautenbach]   (02.Sep.2016 3:08:13)
Hi Ralf,

I found the following snippet on another site:
“In the AGC, up to 64 wires could be passed through a single core,” writes Ralf-Udo Hartmann in his personal website.

I could not find this text on your website, but just wanted to correct the statement.

The very first block I AGC rope memory had 12k words (4 strands of 16 sense lines = 64 wires), but this was very quickly upgraded to 24k words (8 strands of 16 sense lines = 128 wires). The block II AGC rope memories were upgraded even more with 36k words (12 strands of 16 sense lines = 192 wires).

I have posted some videos on YouTube about the flight AS-202 rope memories that I discovered last year. Please have a look and I would very much appreciate it if you could add a link to this on your website.

Best regards,
Francois Rautenbach

PS. Sorry my German is not good enough ;-)
Answer: Hi Francois,

Thank you for the incredible information. I added text and your Youtube link as well. I always happy when viewers contact me and give me correct information!

Best Regards,
Dr.Ralf-Udo Hartmann

1. Paul Koning   (27.May.2016 2:06:14)
Hi.... on the "core rope memory" article, it's not just transformers, and it really mostly isn't. Brent Hilpert did a good explanation at , and the article from 1963 by Kuttner of Burroughs he cites is very clear as well. In particular, core rope memory uses (and needs) magnetic storage type cores, with square hysteresis loops.
Answer: Dear Paul,

Thank You for your information. I added you and your information link to the article.


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