RK05 interfacing to unibus PDP-11 (was RK05 stuff)

I reracked these drives into a tall cabinet today so I could get to the tops and bottoms of both drives. In the process of moving the drives, I unhooked the cable that connects the two drives together (drive 0 and drive 1). I decided to check the drive that did not have a cable connected to it (drive 1), and it magically works now (in standalone mode). The drive spins up, the heads move in, no terrible sounds or anything like that. The READY and ON-CYL lights light up and all appears to be fine. The other drive that still has the cables connected to it still didn't spin up. I then removed the M930C terminator card from drive 1 and put it in drive zero, removed the card that had the controller cable attached to it (M993 RK8E cable), and powered it up. I then tried loading a pack and this drive works too, spins up, moves the heads and lights the READY and ON-CYL lights. Next step is to make sure these drives have the right cards to be able to hook up to an RK11 controller (the M993 having RK8E written on it doesn't sound good), install the RK11 card set in my 11/34 and connect the drives and see if RSTS/E recognizes it. I do suppose that I should do some cleaning on these drives because although the foam hasn't turned to goop yet, I do see a few small fragments of the foam laying inside the drive area that I didn't see before. Ashley -----Original Message----- From: cctalk-bounces(a)classiccmp.org [mailto:cctalk-bounces@classiccmp.org]On Behalf Of Tony Duell Sent: Sunday, July 18, 2004 12:26 AM To: cctalk(a)classiccmp.org Subject: Re: RK05 stuff (was RE: cctalk Digest, Vol 10, Issue 74) Firslty, put a termionator card (M930) into one of the cable connector slots if the drive is not cabled up anyway with a terminator in the 'out' slot of the last drive. I seem to rememebr that RK05s do odd things if they're not terminated (and you might also want to try it with the drive disconnected from the controller, with just a terminator, in case it's something like the ACLO/DCLO lines on the bus being asserted). Now, the spindle motor is controlled by a relay on top of the PSU. From what you say in another message that relay is never being energised. The next thing to do is to trace the relay coil signal back to the logic and to find out what has to be asserted for the relay to pull in. There's certainly an interlock switch circuit -- 2 switches in series IIRC that detect that there's a pack in and the door is closed. Obviosuly the RUN switch has to be on. And I think there's some kind of power-OK line. Maybe more. Now find out which (if any) of those signals are not being asserted (if all of them are, then trace through the logic itself, of course), and find out why not. Maybe just a switch that's not closing, maybe more. If you need more help, I'll dig out the prints, but it's a little late to do that tonight :-) -tony