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craig@sbc-85.com wrote:

isn’t it great how the bubble board waited patiently for you to come back? I must have been exciting to see this actual information come back out and not just random bytes.

Yes, it was incredibly patient. How many others would have just given up after nearly 40 years? It was a little reluctant though. A few times it seemed to get into an odd state where the bootstrap was getting data that seemed to be from somewhere other than the first pages. The data was apparently an older version of fdos located at 0xc000, so it appeared valid, but I was suspicious. I was just about to try using it there anyway when it changed to a version located at 0xe000, which matched my old printout and notes. After more checking I took a deep breath and ran the code at 0xe000. When it calmly asked for the date I just looked at it for the longest time. And again when the "DIR" command came back with a list of files. It was, as you said, very exciting, almost shocking.

with the forward and reverse link on the PIP trace, dumping the whole thing seems like a next logical step. I hope you are able to piece back together whatever is left.

Yes, I think there should be more there. The file dates have fairly large gaps that don't seem reasonable because I'm pretty sure I would have been using it regularly. One text file has some binary data tacked on at the end, and one program runs, but a lot of what it prints out isn't ASCII. I have very dim memories of thinking about tracing all the files to try to figure out how to fix things up. My job at the time took me out of town every week so I only had weekends to work on this, so I suppose I went back to using cassettes and never did get the MBM straightened out.

I will send photos of the patches on the v1.0 bubble board.

I got them, thanks. I see what you mean about doing the DC-DC change before installing the part.

Thanks again,

Denver