John, when I built the first of my two identical 'original configuration' ELFs (I have the original and my duplicate is (I think) still on display at Bletchley Park, both I (with mine) and the Bletchley volunteers (with theirs) noticed a slight glitchiness when making changes to memory. I my case, I initially attributed it to just clumsiness on my part, or brain fatigue during tedious program entry. When multiple guys at Bletchley contacted me about experiencing the same issue, I played around and found an alternate sequence of toggle switch movements that seemed to completely cure the problem. I think my online-published ELF documentation still shows the original sequence:
- MP up
- Press IN repeatedly until the byte immediately before the desired byte is displayed
- Set 8 toggles for correct byte contents
- MP down
- Press IN once
- MP up
In my correspondence with Bletchley, I have a record of the improved sequence, but offhand I don't recall what it is. My computer's boot drive took a dump over this last weekend, and although all normal data was automatically backed up, my OUTLOOK emails were not (oops!), so at the moment I cannot check to see what I told them. A data recovery service is working to recover those stored emails, but it might be a couple weeks before I (hopefully) have access to them again.
Maybe somebody else on this forum has the answer in the meantime.
Paul Schmidt ocleide@...