WAS .... PDP-11/23+ and rx-02 drives, need help!!!

[g-wright]

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.

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M