Robert, is Scot Sealander on 60deg? You should talk with him if you don't already. At one point he'd resurrected and modified the MAF / SD hybrid code in early 80s 2.8s so he could correlate SD calculations with MAF measurements. He wrote code that would self correct it's VE tables and after seeing too much activity went back in and reworked the SD calculations to 1% accuracy. When a former GM calibration engineer looked at his code he exclaimed "It's overkill. 2% is more than sufficient." I'm not sure Scot knows of that part though. Anyway, Scot's a very knowledgeable guy and I believe he's still out there posting.
Greg, as I was learning GM code I had all sorts of props set up. For example, before I'd learned "C" I wrote code in Qbasic to do some of the ecm math so I could watch how the code worked. Problem was, Qbasic didn't do hex and the math had to happen in hex to match the ecm. So I had to write the program to convert decimal to hex and perform math operations on letters. Lotsa work but I learned a lot.
Another time I had pink index cards spread out on the living room floor representing the stack, registers, and memory. I was moving cards from pile to pile, increasing and decreasing the stack with each operation because I just didn't have the picture in my head of how it all worked together. It gave me a visual representation that I can still use today. And I was able to donate the cards to my wife for recipes when I was done. :) x
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