Analog computers, once considered obsolete, are experiencing a revival among a dedicated group of enthusiasts. Anabrid, a startup focused on hybrid analog-digital chips, has created the THAT analog machine to raise awareness about the possibilities of analog computing. The THAT is a small open-source machine that can be interconnected with other units for increased processing power. It is programmed by wiring up mathematical functions using patch cables, and its outputs can be displayed using various tools. The author experimented with the THAT and found that it worked smoothly, offering a unique and well-designed entry point into analog computing.
https://spectrum.ieee.org/try-this-new-analog-computer