I have never dealt with a S/34, but now that RCS/RI has one, maybe that will change. Anyway, if it is anything like the slightly later S/36 and S/38 machines, you will be looking at a very complex processor and an VERY hacker unfriendly OS. Normal minis these thing aren't! They were designed very conservatively for business applications and are meant to run day-in day-out doing the same thing, like point-of-sales applications. They are not powerful or fast, but they never broke or crashed (some S/36 systems have run for a few years without a reboot or failure!). You can hack on these things from the ground up, but do not expect much in the way of programming tools or non-COBOL languages. William Donzelli william(a)ans.net