11/45 status

Jay West jwest at classiccmp.org
Mon Feb 28 20:17:05 CST 2005


I finally got an hour free to dig back into my /45 restoration. Thanks to 
some spare boards to help test and some very good "CE quickdocs" (thanks a 
million ashley!), I got a little further. However, it brings me to two 
questions.

1) In the absence of full docs on the MF11-L... I'm not sure about the 
following. It looks like the 1st slot of the MF11-L backplan gets a unibus 
in (A-B) from the last slot of the cpu backplane. The 2nd slot is my G110, 
the 3rd is my G231, and the 4th slot has my H214 (C-F) in it. But looking at 
some of the docs, it appears that an H214 can be in slots 1, 4, and a few 
others per the diagram. My system arrived with one H214 in slot 4. Should it 
be first... in slot 1 under the unibus in? Since I had a spare from ashley, 
I put one in slot 1 and one in slot 4. I know the jumpers on the other 
boards may not reflect 16K, but I figured it might change things. So if I 
have just 8K set up, should the H214 be in slot 1, 4, or does it matter?

2) My front panel has an oddity (to me). If I select say address 10000 and 
hit load addr the address lights respond correctly with 10000. I then hit 
examine and get nothing (blank data lights). Whatever... but here's the 
interesting part. If I keep pressing examine over and over again, the 
address lights count up just like they should - except they skip bit zero 
(the rightmost bit, either 0 or 15 whatever dec nomenclature is). I don't 
mean that the rightmost bit just isn't displaying correctly, the actual 
counting sequence acts like the rightmost bit is the 2nd light from the 
right. I can tell it's not just a bulb problem because I don't have to hit 
load addr twice to "move on", the count is smooth and sequential without the 
rightmost bit. Any thoughts offhand?

I know my memory system is likely not jumpered right. I'm looking through 
those jumpers either tonight or tomorrow and verify them.

Thanks for any thoughts!

Jay 




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