WOW!!!! $15k DEC PDP-8 CLASSIC MINICOMPUTER SYSTEM DIGITAL PDP8

For the mainframes, I am not sure when chip level schematics stopped appearing. They were available in the late 1970s, with the 3031 (a TRUELY huge stack of paperwork). S/360s and S/370s had very full maintenance sets, as did S/3s, and pretty much all of the tapes, disks, punches, readers, control units, and so forth. So, no, schematics definitely did not stop appearing at the advent of the S/360. I suspect they went away with the 308x line (which makes sense). I do not think S/1s had full chip level schematics, as it was a board swapper family, but the internals were very open. That was the point of the family - finally IBM agreed (and encouraged) 3rd party support. They actually managed to get some, as well (CDC under the Cambex name, for example) before the line died. The smaller machines (S/36 and such) were board swappers, I think. I have never seen full maintenance docs on them. William Donzelli aw288 at osfn.org