How to enable modifier keys in X11.
https://emacsnotes.wordpress.com/2022/08/16/who-stole-c-c-and-possibly-other-keys-from-my-emacs/ looks interesting too.

Description of the various programs involved in sending and receiving e-mail, as of 2012.

From the author:
"I was looking for a simple way to backup data on Android devices directly to a device running GNU/Linux connected over a USB cable (in my case, a desktop computer).

Is this really so unique that it’s worth writing a new article about it? Well, in my case, I did not want to buffer the data on any “intermediate” devices such as storage cards connected via microSD or USB-OTG. Also, I did not want to use any proprietary tools or formats. Instead, I wanted to store my backups in “oldschool” formats such as dd-images or tar archives. I did not find a comprehensive howto for that, so I decided to write this article."

The Rπ 0 can be used as USB device and simulate serial, ethernet, MIDI, audio, human interface device (keyboard, mouse) or a combination of up to 3 of these. The combined mode does not work well on Windows and OS X.

Just what it says. Contains interesting historical background.

How to adjust Windows via the registry (in german).

Blog entry describing how to write extensions (called eggs) for the Scheme compiler Chicken.

Description of various electronic circuits, including measurement results. Mostly in german (there is some english content, which I have not yet read).

Very nice description of a simple way to start a Common Lisp project using Emacs and ASDF.