Thanks to everyone that took the time to respond. As the story goes Henk (My 11/60 buddy) was right on the money with the the board location. I started out there a Year ago but in time made the mistake of not following my notes and installing the board below the disk controller. The other problems where, none of the Blank "DEC labeled" disks will Format even now, but will work on a CPM machine. The drive looks for something very quickly and errors even in single density mode. I did get some new "DEC labeled" disks to work now. The other issues where that 2 out of the 3 sets of RK-02's where Bad and only 1 of my RT11 disks will boot. So I had a large hole to dig myself out of. All are working now. I just went through 10 sets of RK-02s and only got 4 going. Most have bad boards. It seems that the lower board is the worst with 5 bad. Most of these came from a Damp location. Someone else had them stored in a barn. I have tested these by swapping the boards into the working machines and using the boards from the working machines in the test machines. On the Hardware side, after cleaning and lubing all seemed to be OK. At least they could boot from either drive. Anyone had any luck repairing the boards ???? What effect does the moisture have on the boards ???? They where not outside just damp air. I have cleaned them with board cleaner and checked the switches for operation. Some of the IC pins are getting rusty. Are the IC's sealed very well or can moisture get in the chips Just think, I still have TE-11/16's and RL-01/02's to get going. Before MY 11/60's. Thanks again Jerry Jerry Wright JLC inc. ....>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Hi, I'm trying to get one of my 11-23's going and finally got around to setting up a TU58 emulator. got it to boot RT-11 and now trying to get a RX-02 working. I have 3 controllers and 3 sets of RX-02's. All do the same thing. The just seems to not be able to find track 1 or Home or ??? The heads just keep going from home to maybe the first tack and back. The heads do load and the system tries quit a few times then pauses and tries again. It then errors on drive failure or read error directory not found, size function failed depends what I ask it to do. I have tried all of the boards and drives. all or them seem to do the same thing. I do not know how good the drives are but can't believe there all bad. I have recheck the switches in the RX-02 and the Jumpers on the cards. Cleaned the drives. tried different disks. Is there some kind of compatibility issue that i do not know about. Or do I have 6 dead drives. The system is a Micro PDP 11, 8 slot Rack mount, with 1 M8189 1123+ 1 M8067 KB 256k Memory 1 M8639 YA MFM rx50 controller 1 M8029 RX-02 controller in this order. Everything else seems to work. I added the floppy card but the rest original. Thanks, Jerry Jerry Wright JLC inc. ------------------------------ M