Telephone exchange from scratch

Two good news.

1. The International Journal of Proof of Concept or Get The F... Out Issue 0x21 is now available in PDF format (pocorgtfo21.pdf) for everyone who is interested. This is a masterpiece collection of articles on computer security, hacking, reverse engineering tricks and such stuff. There is something that makes me tick about this magazine. I am trying to read each article very carefully, and I was really waiting this issue to come out (especially knowing that it will contain long read about phones).

https://github.com/angea/pocorgtfo - see contents of each issue of this magazine

https://unpack.debug.su/pocorgtfo/ - main mirror

2. The Cadr-o-station device is now have new home - it is now part of b4cksp4ce hackerspace in Saint Petersburg, Russia. The space inhabitants are now trying to make use of it and add missing features to it. Good luck, guys.

This is CADRSTATION. Special purpose old landline phone exchange for small households and hackerspaces. It requires only one rotating stepping switch. There is a difference compared to other exchanges: here all telephones are connected together all the time and talk to each other in a big multi-conference style. The rotating switch is used to send ring signals. Optional external connection to the city phone socket is planned.

It bears CADR hackerspace logo, because it was assembled and tested there.

And here is schematics (ask me, I will tell you more):