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May 9, 2021 Archives
Sunday, May 9, 2021
CONTEXT: SL-1: What Caused America’s First Nuclear Meltdown?
Here is the original U.S. Atomic Energy Commission film about the accident, investigation, and aftermath.
Posted at
15:13
TRACKING WITH CLOSEUPS: HP 9825 Repair Part 7: How Dynamic RAM Works (or Doesn't)
In the next installment of the “everything is broken” saga, the focus moves on to the random access memory (RAM) of the Hewlett-Packard 9825 laboratory computer. The refresh circuitry appears not to be working, which causes the system to rapidly forget what's been stored. What's refresh? Perhaps a deep dive into the history and technology of dynamic RAM will refresh your memory!
The HP 9825 uses the 4116 dynamic RAM chip, which brought back…memories…as I designed a 64 Kb memory board in 1979 using this same iconic chip.
Posted at
11:41
CONTINUITY: SpaceX Starlink L27 Mission
SpaceX successfully launched Falcon 9 booster B1051-10 for the tenth time, achieving the original reusability design goal for the first stage, then recovered it on the drone ship. The mission successfully placed sixty more Starlink satellites in orbit.
Posted at
10:20