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dippy [2020/01/07 13:09]
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dippy [2020/01/07 13:21] (current)
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 Bubble memory? ​ Real bubbles! ​ 2m of polycarbonate tube with internal diameter of 7mm may support a 3mm bubble. ​ If we leave about four bubble diameters so they don't merge (just a guess), then we may fit 128 bits into one tube.  Very visual - I want visual memory if at all possible, https://​hackaday.com/​2019/​12/​20/​tiny-bubbles-in-the-clock/​. ​ As solonoid valves are used for the air bubbles this tilts in the direction of a relay computer... Bubble memory? ​ Real bubbles! ​ 2m of polycarbonate tube with internal diameter of 7mm may support a 3mm bubble. ​ If we leave about four bubble diameters so they don't merge (just a guess), then we may fit 128 bits into one tube.  Very visual - I want visual memory if at all possible, https://​hackaday.com/​2019/​12/​20/​tiny-bubbles-in-the-clock/​. ​ As solonoid valves are used for the air bubbles this tilts in the direction of a relay computer...
  
-[[wp>​Phosphorescence]] using [[wp>​Strontium aluminate]]. ​ One large circle with (say) 1025+-1 dots of phosphorescent paint (or maybe 32 circles of 33+1 dots so that all registers can be seen). ​ These are read, erased and written using light. A red LED erases, the difference of light levels before and after erasing say whether the dot was charged or not.  On the next clock cycle the dot is written again. ​ Green is the strongest, red LED erases. ​ This has the huge advantage that the memory is visible and the clock speed is independent of the memory - phosphorescence can last hours and we only need minutes. ​ If the disk is static and the read/write head rotates then the memory will be visible. ​ Holes can be punched in the disk radially to the dots to give timings, then the clock is derived from the rotor speed.+[[wp>​Phosphorescence]] using [[wp>​Strontium aluminate]]. ​ One large circle with (say) 1025+-1 dots of phosphorescent paint (or maybe 32 circles of 33+1 dots so that all registers can be seen). ​ These are read, erased and written using light. A red LED erases, the difference of light levels before and after erasing say whether the dot was charged or not.  On the next clock cycle the dot is written again. ​ Green is the strongest, red LED erases. ​ This has the huge advantage that the memory is visible and the clock speed is independent of the memory - phosphorescence can last hours and we only need minutes. ​ If the disk is static and the read/write head rotates then the memory will be visible. ​ Holes can be punched in the disk radially to the dots to give timings, then the clock is derived from the rotor speed.  Alternatively use a tape loop, that's a lot like [[wp>​Colossus_computer|Colossus]].
  
 === Discrete physical options === === Discrete physical options ===
dippy.txt ยท Last modified: 2020/01/07 13:21 by admin