LGP-30 Video Update

On Feb 25, 2017 9:24 PM, "Cory Heisterkamp" <coryheisterkamp at gmail.comwrote: systems stable, I tightened the head spacing on the three timing track heads (using brass 0.001" feeler gauges though I may have to go closer). This has resolved 'hanging' when hitting Start; it actually appears to execute for a cycle before toggling back to Stop for each press of the Start key. Of course without being able to see what's happening, it's likely just 'executing' garbage, but it's a solid first step. Stop/Compute toggle for each key entered and status neons on the flip-flop cards are registering unique bit patterns as each comes in. 'T' and 'T-bar' signals propagating, but still haven't licked the 'digital display' issue. After further probing, the display began to stabilize and the single line expanded into the proper 3 for Counter, Instruction and Accumulator, and eventually a bit pattern emerged for the Instruction. No signs of data yet for Counter nor Accumulator, and there is an extremely pronounced 'throbbing' and visible refreshing. Here's a video: https://youtu.be/Nhya46V-l70 when putting my scope on any of the three timing heads which seems a little strange to me (example on lower trace). Here's a quick vid: https://youtu.be/JjRKDWVUyjA off the drum surface for a solid signal, purely conjecture at this stage. -C Great news,,,bring it to life. Bill Degnan twitter: billdeg vintagecomputer.net