The S/3s are interesting machines, in that they went against the grain IBM set up with the S/360s. The idea of the S/360s was to unify IBMs product line, eliminating a bunch of completely non-interchangeable machines. One of the families to fall was the 1400 series, basically very simple machines made to replace punched card equipment. The S/360s, however, were overkill for such an applications - even the stripped down S/360 Model 20. IBM decided to spin off a new product line, using S/360 (and 370) technology to make an updated 1400 box. They did, coming out with the S/3s in the very early 1970s. Probably not. Just do not destroy the disk packs (or reformat them), as I am sure they are far more rare that RL02 packs. Does anyone have an S/3? I heard there was one in Canada, as well as one in Great Britain. William Donzelli william(a)ans.net