11/45, sick or not?

Jay West jwest at classiccmp.org
Tue Jul 5 18:08:18 CDT 2005


I finally allocated another day to spend on the 11/45. Unfortunately, I must 
say I'm not sure if it's sick or not, hopefully someone can help.

First, none of the blinking lights programs I've seen blink the lights. I 
can store and retrieve the program correctly, but when I put 1000 on the 
switches and hit load address then run, it goes into run mode but no lights 
blink (with any display switch setting). Halt makes the processor halt. 
Here's what I did:

1000 005000     start: clr r0
1002 005200             inc r0
1004 006100    loop: rol  r0
1006 000005             reset
1010 000775             br loop

On this program I put 1000 in the switches, hit load address, then run. 
Address lights constantly show 1010, Data lights are blank, and the Run 
light is on. Data Paths setting shows 0, bus register setting shows 5, uaddr 
shows 177774.

Another test...  if I store a 5007 (clr pc) in location 0 and start the 
processor at location 0, the address lights show all 0's, the data lights 
show 2, and the following lights are lit - pause, master, kernel. I also 
tried this with location 0 set to 777 (br .) and get the exact same results.

More info... just after power up, the address lights show 20, the data 
lights show 21043 (data paths). Master & Kernel are on. The uaddress setting 
shows 177570.

So... I decided to go back to basics and check all the power points at the 
pins on the backplane. Here's what I found:
A02A2 0
A06A2 4.931
A10A1 4.931
A26A2 4.931
A19A2 0
A16A2 0
A21A2 0
E02B2 -15
A17V2 0
A22V2 0
A17U2 0
A22U2 0
F17C1 0
E15A1 16
E01B1 9

Since my machine only has regulators at B, C, D, E, and F, I suspect the 0 
volt readings above are ok. All the 5 volt test points have a very clear .2v 
sawtooth pattern (which looks fairly smooth at 5v). Since one manual says 
the ripple limit is .15, and another manual says the ripple limit is .20, I 
suspect I'm ok there. The ripple on -15, 16, and 9 I can't see any 
noticeable.

And by the way... the cpu cardset was borrowed from another listmember and 
tested before I received it so I don't think it's something wrong with the 
cpu cardset itself.

Any thoughts?

Jay West 



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