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Re: [N8VEM-S100:5648] Re: ZFDC TIL31 DISP9 code meanings

Thanks Thomas. I will try your configuration this evening. 

Is there a version of the ZFDCDIAG program that doesn't require CP/M? I guess worst case I can put it in my IMSAI but I prefer testing on my test bed rather than a live system. 

Sent from my iPhone

On Nov 21, 2014, at 11:05 AM, Thomas Owen <thomasbr...@gmail.com> wrote:

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. 


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.



Rich Cini
Collector of Classic Computers
Build Master and lead engineer, Altair32 Emulator

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