4 ms·

So what color was P2 Phosphor?

• Andrew_nenakhov 5y ago
  Blue-green. Check standard phosphor types section here: https://en.m.wikipedia.org/wiki/Phosphor https://en.m.wikipedia.org/wiki/Phosphor
• daveslash 5y ago
  My first response was ¯\_(ツ)_/¯ -- but I dug some more and found out that P2 is a Blue-Green color used in oscilloscopes, but it doesn't look like monochrome computer monitors were ever made for it though [1]. [1] https://en.wikipedia.org/wiki/Phosphor#Standard_phosphor_types https://en.wikipedia.org/wiki/Phosphor#Standard_phosphor_typ...
  • duskwuff 5y ago
    P2 was a long persistence phosphor. It was used in analog oscilloscopes because those couldn't be refreshed -- the waveform was drawn onto the display as it was received, and the phosphor was responsible for making that visible. You wouldn't want that in a computer monitor. The computer is perfectly capable of refreshing the monitor, and the long duration of the phosphor would make anything rapidly changing (like a scrolling display) impossible to read because all of the previous contents would interfere with the current image.
    • kevin_thibedeau 5y ago
      Storage tube monitors did use long persistence phosphors. They were a way to simplify the refresh and memory requirements on early hardware.
• akiselev 5y ago
  Blue-green. It was used mostly only in oscilloscopes [1] because the persistence time was really long - good for instruments where the signal might be changing faster than a human can perceive not so much for low latency inputs. [1] https://www.wellenkino.de/565/565-1.jpg https://www.wellenkino.de/565/565-1.jpg
  • kbelder 5y ago
    And Asteroids arcade machines, I believe.