My earlier hack was a ICL 2903 running George OS, involved creating large file in area previously used for system journal and could then dump that file out and

My earlier hack was a ICL 2903 running George OS, involved creating large file in area previously used for system journal and could then dump that file out and read the content of the system journal and that was how I got the admin password. Other one I did was in effect a keylogger that I ran on the system that would take control of the terminal it was directed too and present login, take the input and then pass to the system making the user oblivious. But for practical use, the old 0800 free calls trick of the early 80's was probably most favourite. Back then they introduced 0800 free calls, when landline calls in the UK wasn't cheap. These got used for marketing, so companies would have there 0800 sales etc. Now, outside office hours they would direct to a recorded message on the PBX. Then what you could do is after the message, if you stayed on the line it would drop you into the exchange and you then pressed 9 on tone dial pad and could dial any number you likes as if you was dialling from that exchange location. Most being in London so was nice for free calls. Had limited use for BBS access, case of all that routing and line quality at times as well initial set-up. But still fun.