11/45 progress

It probably depends on which HP division produced the manuals... The ones I have for test equipment are _excellent_, with schemaitcs, theory, calibration information, and so on. Some of the best manuals I've seen. Ones for handheld calculators were not supposed to get out from service centres, but a few did. Again, they're excellent, and contain a lot more info than you'd need to fix the machine (particularly if you're a service centre with all the spares to hand!) I've not see many computer manuals. Certainly the one for the 2100A is excellent (one day I must get that machine running again). The one for the 85A is less good. There are full schematics in the appendix, but no theory of operation, etc. Which leaves the class of machine I work on the most. Desktop calculators. AFAIK, _no_ desktop calculator service manual contained any schematics for the logic. If you're lucky the PSU schematics are there. Which is why HOPCC started producing their own info on these machines... -tony