2017-06-08 18:38 GMT+02:00 Paul Koning <[email protected]>: > > > On Jun 8, 2017, at 3:22 AM, Mattis Lind via cctalk < > [email protected]> wrote: > > > > I happened to find a RS64 / RC11 combo (missing the PSU though). The > > previous owner was an ex DEC field engineer that himself got it in the > > beginning of the seventies. It is used but has the shipping lock on the > > motor axis. > > > > Maybe the chances to get this working isn't that high especially since > the > > donator told me about all sorts of problems that happened to them. As far > > as he remembered there were quite some problems with these RS64 and the > > PSUs. > > Nice find! I don't think they were all that common; they were only made > way at the beginning of the PDP11 line. I used one in college; it > developed a bad bearing at one point, which was cured simply by sending the > motor out to the local motor shop for a new bearing. Apart from that it > worked fine. >
This is good to know. Maybe it will be possible to get it working. Problem though is that there usually are a few TTLs that has gone bad. And without a schematic it is much harder to narrow down the problem. The TC11 I have been working with had been stored in a dry closet, but still had a bad N8281 chip. But with the help of the diagnostic and the schematic it was quite easy to find it (Current Address register bit 9 stuck high). Well. Nobody has posted any thing about RC11 schematics, unfortunately. Maybe someone has a paper copy that could be scanned? Or that I can borrow to scan? With the RS64 and the RC11 it would be possible to run DOS/BATCH 11. Could be interesting to test it on the real hardware. Are there any other RS64/RC11 owners out there that has them running? Jay Jaeger lists a RC11/RC64 as part of a PDP-11/20 system on his web site. > > paul > > /Mattis
