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pdp-11/34 decdatasystem

Mal

Experienced Member
Joined
Apr 3, 2008
Messages
91
Found this pdp-11/34 decdatasystem buried in the back of a recently acquired collection.

decdatasystem-front-1.jpg rk07-1.jpg

I initially thought I only had the TU10W and RK07 drives. But once I figured out how to open the lower front panel (thanks Luigi) I discovered there was an entire 11/34 chassis down there - complete with programmers panel and controllers for the RK07 (RK611) and TU10W.

All looks to be in good condition. I'm looking forward to getting this running one of these days.

Does anyone have experience in restoring a TU10W tape drive? I'd be interested in any few pointers for things to watch out for.

Here's a link to some more information about it -> http://avitech.com.au/?page_id=903
 

Al Kossow

Documentation Wizard
Joined
Sep 1, 2006
Messages
2,874
Location
Silicon Valley
Does anyone have experience in restoring a TU10W tape drive? I'd be interested in any few pointers for things to watch out for.

The rubber membranes in all of the vacuum switches will probably need to be replaced.
 

m_thompson

Veteran Member
Joined
Jul 8, 2014
Messages
1,714
Location
Rhode Island, USA
The original differential vacuum switches that Al mentioned were probably made by Fairchild. World magnetics, http://www.designflexswitches.com/, bought the manufacturing rights from Fairchild, and still makes the switches. I use their switches for a TU45 restoration. Some of the World Magnetics switches are available from Digikey.

Take a picture of the boards installed in the 11/34, and post an inventory of the board part numbers. The part numbers are on the handles, or on the metal stiffener on the top of the boards. We can then give you some more advice about bring up the system for the first time.
 

pbirkel@gmail.com

Veteran Member
Joined
Apr 7, 2013
Messages
526
Location
Silver Spring, MD, USA
Posted on his site:

PDP-11/34 Boards

Here is the board list in the 11/34 chassis:
Board Number Description
M8266 CPU Control
M8265 CPU Data Path
M7859 KY11-LB Programmer Console Interface
M7856 DL11-W RS-232 SLU & Realtime Clock
M7891 MS11-lx MOS memory (size TBC)
M7819 DZ11 8-line Asynchronous Multiplexer
M7819 DZ11 8-line Asynchronous Multiplexer
M7891 MS11-lx MOS memory (size TBC)
M7904 RK611 Controller (for RK06/RK07 drives)
M7903 RK611 Controller (for RK06/RK07 drives)
M7902 RK611 Controller (for RK06/RK07 drives)
M7901 RK611 Controller (for RK06/RK07 drives)
M7900 RK611 Controller (for RK06/RK07 drives)
M7911 TMB11 Controller (for TU10W tape drive)
M7912 TMB11 Controller (for TU10W tape drive)
M796 TMB11 Controller (for TU10W tape drive)
M7821 TMB11 Controller (for TU10W tape drive)
M105 TMB11 Controller (for TU10W tape drive)
M795 TMB11 Controller (for TU10W tape drive)
M9302 UNIBUS Terminator

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m_thompson

Veteran Member
Joined
Jul 8, 2014
Messages
1,714
Location
Rhode Island, USA
I would remove the backplane jumper between the processor backplane and the RK611 backplane. Then move the M9302 UNIBUS Terminator to the processor backplane slot where the backplane jumper was removed. That would make the system a little simpler for debugging.
 
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