Hello Rich,
I have just completed my board and can tell you of some problems I had 
during check-out that were due to a few Chinese chips that got into my 
mix.   So, I got mine to count with the left digits but I cannot remember 
what the display was before I set all my jumpers.

What do you have now jumped?  All chips installed?

This is what I have (for 3.5" drives):

J5, J13, K1, J8, J11, K15 (top 2 pins)
P79 5-8  (note the pin numbering! bottom left is #1)
P78 1-2, 11-12-8, 15-16 (bottom left is #1)

With this jumpering my board counts on the left digits and the right is all 
Zeros.

let me know how this works out for you.  

Thomas



On Tuesday, November 18, 2014 8:29:51 PM UTC-5, AltairManRich wrote:
>
> All —
>
> I finished building the ZFDC and I have a question about the codes on the 
> displays. Part of the test procedure says that you should see “3” in the 
> right-most digit. Then, you replace the test ROM with the firmware and the 
> two left digits should count to FF and roll-over (they do) but the 
> remaining three should all have “0”. On mine, the last digit still shows 
> “3”.
>
> What does this mean? I still have to get the test program running and to 
> pull an 8” drive from the attic, but I’m wondering if this is significant 
> in some way.
>
> Thanks!
>
> Rich
>
> --
> Rich Cini
> Collector of Classic Computers
> Build Master and lead engineer, Altair32 Emulator
> http://www.classiccmp.org/cini
> http://www.classiccmp.org/altair32
>

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